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1ST MARINE DIVISION - INTELLIGENCE STUDY HEADQUARTERS FMF - 7 APRIL 1951 - 31 AUGUST 1951

Korean War

Korean War Project Record: USMC-1199

CD: 15

United States Marine Corps History Division

Quantico, Virginia

Records: United States Marine Corps

Unit Name: 1st Marine Division

Depository: National Archives and Records Administration

Location: College Park, Maryland

Editor: Hal Barker

Korean War Project

P.O. Box 180190

Dallas, TX 75218-0190

http://www.koreanwar.org

Korean War Project USMC-00121256

c/o

11o~~~-t.w~~t ei'S, -._' _. : · _ , _'_. · _ let He.rine D1Vtsl.¢ri, 11'ieo't l~t~rlne lf¢NO

Fleet l'oet Off1ce, San Frt.rio1Scc;>, '0a1'l.f<l>'rt1~ 2: J?~H Jnl. a A:,r11 1,.951

Jo..asiete.n·t Uhief of St~ff'.., :G-2 D,.etr1.-l>utS.on List lnt<Jl.ligcnce Sti!O.Y 1-51 {!'UKHAN CORRIDoR A~lP li!t~lt:!:RO!l6)., fonit'l.l'd ing pf

{l) subject atu&w.; but! on L1st t

' ~· 2. ';'O~;ical content of enclosu:re. (li 'l.1!. a~ ,:onowe: Genert.'J.J Terrt~in 1 RiVer!! r.no. stree.i!;St P,oaMJ ?-ll.i\F.\O~,a,a, !1Q!Uoo.l ?t'9p~~·~ !\nd. > Defenses. overlay!! r.nncnoeo. tl;\lre\o de,)'Wt; 11 <rr~.(f1oab1ll.1i:f of ROa(le cna selected Tri-'ns" and nw~rnY lio:r~s1vc ?os1t1oM

1',

D! S~~.!BUTIOr L!9'r ~ 2 ::"JSAK ~ ~ !X COti18 ·a X oo !"·"a. 2 - 5tlt a0K D~-V 2 .- l. 13t Otl'V D1. v 2 2nd D1V 2 27tl1 roB

6 l at 14r.r1.nes S - 5th u.e:~rines B 7th l~nr1MS 6 ...- l.l.tl1 Hnrines 6 l st !<t~C Regt 2 ~ 1st l·;T !m · 2 - ?th 1~l~ r.n 2 - 1.. st ~r.nk En 2 1at Engr Bn 2 ... lot or&. Bn 2 ..... 1st slg 'P--n 2 - l$t sur' ~n 2 }.St Hod Btl 2 :1q Bn

l. Cl·~O 1 .. F~·~? 'E-1-.. C l. l·iCS ~ - £(I.e). 11r.r

1. ~ !» 1 -ADO l - 0/8 2 - G-5

·z-o--4 l D1" wvo l .... ·ns.v sne;r 0

. , "•


DECLASSIFIED

~:rr~:r~ .. ::: ..... t~;1;r'?i!:~~:~~i~~~~~~~w~~1'~~~~;~;1;c~~r~~;!;:~f"l![ .. ~ .. f~~~::6' ' ,.,_ ;>w '~~fn':~:_:~-1:

OO~YFIDENT!P..L

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Heao.quartete 1st Harine b1V1P1on., Fl. 'e-at H9.r1ne -Force

Vleet Foe.t OI'I-.l.oe; San F_rS:h,o~a.cc;,, G~lifornia

7 April 1951

l-51

l'UK!W' goRR ~~()~ _A~p EHyt3Q.ij~

,. 'li :,ji:r.:m

!~e., ,~ferenoe: AHS L76l KO~EA l;50,00.0j .~e·~-~-~ .-S~?·~:B ~.I~;~~I e~ )"V;_

t:nolost.tres 1

·r.

CT ?006,

_( 1')

I,., \• -1"-1.

overl'a:Y - "Traff1oa'P111't:V or :Roads and Tr11Us", Conf~a.ent~a~:; dtd 7 Apr 51.

~y~rl~lf _ ~ ~e·e~y. ~-~t!!lslve naentlal, o ta ., !lpn _0.1.,

Selected

Con-=

. a. Thia stJu'y "''B.B prep~t~ed by the· Ph6togr.aph1~ _Int~_rprat~tion Team of the G-2_ section. It oove:re_ generally that areacof immectiate 1nterest to this Division. Ct.trrent non-ava~la'P111ty or photo cover to the north of th1 s· area l1m1 ted. the- exten_a:~on pf· 'thi~ $t~d.y .beyon~, .. ...._~ ---~----• ---"-'~-- 1.t-4fo.· .. 'u ........... .,, ... ...,. ..,;..,.,..,a'i....,+ ,...,. 'l..,h .... to:l'\ t\r.U.:t~Y' A1-~Y6 pl'tlti~UV UV.l'VU'1:1.l"U.+-.I.II~"""'"'• u ..... ~~'"'"''"'·"' .•vv~·~., ,... ... ;i:' .. ,.v.,. .............. ,_~-ready requcat~d ·Hill .enable· a subsequ-~h_t eitten~1on- of this s-~ud.y •

·b. rlource ~atertals for this st\.ldY. were as foll0~1s: · Available nhotO. coVer; -F:c- rrerre. 1n stu.dy., l,\!O 'i 6 on ~'Ortherh_ leo rea; ._ ~t!SAK ~-. Pfmtogr··aphic :Cnterpre_tat1on.- Ra~:~ort~; IX .. Co~;e Phqt'ogr~ph!c · !nter.protatlon Re:;or·ts; _ stu~,i~e-·ma~~ :bY_ ~X. 0?~-fHl Jng1n~al;'~; and .st~..td!es 'Py let Sngineer l'.e.tta:).1on Of th18 l.llVl8~0n,

. . . • -~-•---- _ _,. ..._ __ £_~ .. •- _.-.. .... _,..,4..,-4...,. 4~i'l4'hJ:~i'!t:~~rl -A~AAS c, Gre.~llt1o pres en ~nv;a.on. o,~ ·, ~-c-",':£:~-~1;-~~~'·'~~~ !~~g ~-~~':;.' ... ·::::-:~· ... ¥:;;;·-..,....A;;:~:

is cont!lil'lod in·-thc follOW'1ng O.OO).Ull~ll"f;!•_f>ne oopl_VI , ..... ~ .. -~~p ~~.w. tr!buted to Qaoh regiment: ·-- · '

DF.Ci ,ASSiFiED


DECLASSIFIED

:~:t:_: ~~~~~·-~~r~~ ;1~~!'::--· ·'.:n~::.:'~ .. /'r .. ;:+H:l:;· ;i ,. ,- --;,

- . ...,,, ,...,,...,, .fA\ ........ t"r.r.d~v &"ttlo :;...,,. , ~o~~ --UV ... VP~<I. V \ .. f ', :·""llo'- >01':""":~\- .. :~.':""'''~.t-;_~~,y'.•,. ~~~¥'f-

(3i :::_crre,in Ane.ly~ie. '<eaterP'$ p,~n~ .. at 'Zggesi

:.nclosl1:re C 4\ tb sms/u{ i'!ll No; 249~--~- - - ·.: ',. ;-.:;.... : ; c .', ... - ' ., '< -,_ -

""

. a,. The .Fl.JKHhl'-a-APlT 1s th.a only 'river ,;h_ ,;ne JJ~vi~ism' a. ~o_ne. .. ~r. aotion. and 1tcute1 the D1'i11slbtl's r.ol\e,totlleeou.tno·f tne-!iWACWOl' 1:t eserrt01 r. ~he· :PrKtLAJ!_~GA~G ·-orlti.riat e~.::.:f'~t ~:~{!~-; -~s·M) 'lJhei""_e: -mountain _ ........... __ .. .P...., .. _ .;..\.<,,... ............ ·...,...,A •~H,rofo .,.,..,l"'''··o 1 tl':!+4;0":Ir'l'l·- -tn't"'l'\+.4hn .C-I'r!h1 A 1"1VAT' ti\.I~'!,Jt\Uit) .l..lVUI V~~l.:' _VQ.IjiV _""l~W.,VV!OOI,-.;tV o!-V,._., .. __ ~ :"'l"t,:w.v.,.•_~ ..... ·":'"¥-:"'•••_ . •··~ .... - .... ~~ is f:l~ort antt fi?~'e s~!lth~a~ ~pWrt· ~" .. l:~~~~~;~t,e~::'.:~;~e~ ;!e ~~~ · H''ACHO~ \Gset>Vo lr, . Cle>se .to 1~e llf1U.r.Q9,- FM <'~~'""l'-""'''"' nao. a.. . .... steal) <rradient . .rockY 'bM ana. banks and··a· tew smal.l :raJ,la e.nC!. rapl.o.s, !n .f~llouing its 'co1.t!-ac SoLlthl4e.~· t:·b:· the HWAOH 10N ... GAt,'G, .it -oar.rioa . a vast amount of Cl.ei'br1a .. ·•.··.

·b. The 1--rJAOB:i"Of.i Reservoir; Oiui,·':9t-.:ttl:~ l.aTgo6t 1n _Kor-ea, is , oxoeeded onlv bv the SUIKO And. OHOSI'l\: ReS<ii'YOl'.l's, It oov ors an

estime.tod 13 .. eq~aro miles' ana_ re..e. a.' :_o~p'dpl~Y'. of a!>:~rox1matoly ",.., " A" "'"" -'"-f"\f"\ ...,.......... ... ~,., ...... mt..-4 ,; ' lo.+-Y.t!l 4 ri4-l+ ., ,.:1"\ r. ~"~'"~Y\i", t"ll.r t..Vnr.. flBm J,.;, 1 .L-.tv 1 vvy 1 vvv Vl.tiJ.,I.v J.e.:t,a•• . ~~',":~ "F.""~.1,.1.~.;r··~, .. ~·o'j•.•.'"" .......................... "'oiJ:":- --····

is 2?5 t.eet high and .. ~a ~ .-~~·~.~~~.¥: ~~:v_:: 1Q;@:t~ 151n6•~ .:~th2· ~~~tet ... ~~y~l flu()f;Ua tee bottroon 51? ano. o~~ -·ree.t. 'a])OVJl_ :~.ea .J.oveJ. ~>.nu c<Ln "• "'""'·' a height of 32 feet above ~he, !l:pUl."'a}'~. · ·

o, Acoorttlng ~jjO t ecl:"u··d.oa~· .atud.16S .1 t .ie .. "otil!~Vc_d- ·that the en e ... my 1s 1noapable ot· bre\6chirl'g.: the dam ·-a~ :(C:T 9018) by demol1tional. how~vor. aerial observ.ere j'la.ve:-noted..1>ha.t.the epill'{~Y.g~<toe.are MM n1',0.~~~ "'" +.li~1" mllYimum P.l(tet\t, 'and 't)l;&.t <>IllY 9. f;l;'ibklO Of 1~£\t-~r 1;·· b6ing'"'-~oi0c:;-tc1:~· -zt~-re-~$ht1);:.$,ly' );)lat.ta~~t,~.·t,h~t ·,t:~ci o.hemy ·is·~-~ . :. · tryirlg 'to raise .the ·.levUl ·of t.ho._.ra~.ot-Vo.i.~~:tc. -!~s .,!'J1~x!..~u.tn e~ev.ati-on and eubsoqucintlY ~q.leaei_n_g-~_flood Qf:W~t~f_by. ~1?9~"f!PS'.~~~.PS.~~~ocl~~ A.nd an111ws.v v.atea. Interrogation Of o1Vl,uans 1n :;;ne area a .. eo · ind1catee that the present ~·iitel' level of tho r.ivor bolo•~ .the o.nm 1s _v;e-11 'bolou· normal for tli.1:s t.1me .. ot. ·~tee.p·;_· . . 1'h1s le ·anot;li~r ·1-nd.i--_· cation that ·the -~nemy t~a .Bl.toh.';:a pl~~·.·.A.r~~~~Jld• ... ~f·,t,l}~_-.:~~.f\.t~.r .. ·-in_._tP·o

• ·• •• '. • o.·'.l..~,I.OIIl...' ... 1.·-.~·.il '1-"> _.,.., ....... _ ........ ..,,.. ...,v-,,1!1

re-a.el'voir has r .. aono_a. lt:e _ma:x:::~.mv.m: 9e:•~rp;,1 ~n!f. ±.! ~J.-~Y:~:: .... ~~Y_':·r:'.:~~~, .... n~riatocks wore ouenod aimul tnneouSlY, · n 1nrgc n.ow :OI ;w'"'"'" wv"'~"' bo-·reiee.eed ~.o,~r\ the PUKHAV RivQr w~~l;l th~ d.<rrJtll of wMa:r varying ... u.t.. .. ~..._··~"A"',_., ... .,.. +\-.,..., ,.n,,.,l"'nl o.~ s1n~ ·-nA~t.-~nu1Afl \1~1nt ... ·In the·ttor ....

. WJ.\f.l' \,I,I..Lt) W.£.~ UJ.~ V.L u~~,., vu,...,~ ... .,. .................. ;:, !.';".,..."' ,.~ ... -·-~··- 4-- . • • . ,.

tiona of tho :t•1ver extending from .tue d~T. south to (0'11 f?306) tlH> _ -- -- - .~ • ..., ......... _ ._.,_ ....... \..-~A- ....... + (tim QO,()MC!\-·t:h~

we.ter may rl.so lU - J.~ y·ee'tl. Ali """~ lJ~~wu_y!~.:'::'~~ ..... ~~~ _;~~ ...... ':'~:;.:' .,. __ _ AAtimatod r1eo maY ree.ol:l 10 feet. 1n. ;;qe \111Ul,un•v" uuv" J?,!."'•" ;::,._:,~ .. t-hn ~i'liAYJ ro.hA.nnPla me.v be e?tn~oted ._tO. ·r_1 S(i_ ~p·:-r(:)XiJilatelJF: 5 f~;t. "'~1 th- i~~u1d;t1~n.., Or ... the en t!.~e· ·rtod~ ··.p~ain wlth: t1.bout i ;. root or we. tor anU r. subsequent be.ck.ing up . .Pf' tP,e river .enO. st:ronme in tho. entire a ron. 'J.'he, de-pth ,of~ ·the '"~~:t.9~ .. ~n ... ~h.~--~~r_rol: c.~e.nnel bol~~: CHU!'JCH'O'< mliy be-expected to rue-·e.oo~~ o ~." reo•,

a. Sou.tl;. of 'tht?. ae.m .the .P!J;!(~tt..N-'GA~tG··o.ont~nV._()S ·Cl._o\'-rn the roe-. . tricted val loy •:>est CHUNClf10t~. At'· :th_e. da~:, tPe. r1'yet._ tl( .f.l~nko~ by steep rooky cli'fra w'hich. Pimitli_Sh. ii.to .. ~ ·~r?ad~~lc~:\"~~~;~,\~! ... ~·,.. ~l-I'TTN~H' ()\J M ~he small strcrme -tnat. emp'tiy •1n11o. 1;;no ·tul\.nJ1.1"-..,..t\.~'IU" t.\1- \01

f~rd~b1 ~-· Stnc1- P-P1l ce.r to he.vc ee,nd an:cr ·gl'D.Vel b·ea.a. 0. At tho .._,roeont 1..-i.mt~, tho PUK'PM!4ANG bel ell the d.~.m is ford

Able at tho spots indicated in onolosuro (1).

.. "

.·,.

•

DRCi ,ASSiFi.ED


DECLASSIFIED

•• ~!

'

OONF!DDN'r!AL

Gcncrtt.l: '

(i) Other thr~n the 'improvell o~.rt tr~.ne bctwoen a1t1os und tOwns,- tho ro_f..a:s of' northern.KorcE' .. h.!ivc.Jfecn ,oone:tr,uoted to eervo as .au-:nl~monte:,l and i.ot:-d.et"' i.,6uttitS :f'oi: :·thO-:J~p.uncac _-'built rt.1l'roc.eta; h6wcN .. or, 'the: mD.in_ .supply -~6\tte :th:i'.q~gh :ti!-~ -oonter !l~ ·.;·V!lfi ~-~~v1·~-!J?n f s zone wtls constructed. ·.also to'!.' .m111 tary i:5Ut'PO~oa; 'rl'l!l ooi'ISI<I'tJOUOn. ~ of tltis i:'o~:d M~. ,the. ror,C from C!lU!ICW'O~. t;'o, K1t,}:$QlW: lj'·M' severely. , . hnmpol:-oct ''bY· th'O rUgg-od o·On·tfitl ~durit'Ain -m.~es·/·'. ,, ··· ·· ··." ·

b. Clnae1fic<~ don ':na. Tra.ffio. Tonnuge:

. I r I '"h n · wioil a 'wfil tih <>\'>\all'lA t ~ withiti · th t · D l.v fa ion· fa ZOii'O ' · o6mo uno-~t.' thr~o ~ g~n0r~l ... ~n-th·€;0~.i~~;_-~ Fit~t~·- -·~hOSe 1-llit·o·~ £~.ro. t:rc~.~tio-nblO ·300 Dnys n yci'.r, tfro -·well mc\!ntc1n.a~., _ ht~v.e t~· i-Y1~tn· of 16 fo?t to· 25 fc._0tj .. P.n(l, permit Spqcde ot 16 tO._:~Q_-JJlil_oe. ~~~~~ _1194_17i,· s~con.d,, __ · .. th<>An whfoh l'l'e :not all ~/eathev. 9.t'0.1)00rly m().1!l1if\1TIGCI, TII'IV(l ·l'.. . ~idth: .c-:r ·is tO 2_5 ·teet,~· .and_ ~)On!l! t· s,~eet't(.Qf ~5_-·t·o. '25 ~:i:l~bs -:pOr· .~pur; and, .th1·tct, "JOCi) 'or! OD:rt· ·trc.'lls thnt~ r.t.o t;OriCft~.ll~ 1 !m~?n·es-?-blo ·tc>" · lo.rgo·.r. _:_V·opioular traffic. The woO~ on ···b.~idgos ~o!'ay_~~c~ed-~bf;-_~~c.-~~~-- ~ Jr.''r.nca·c 110'1.'0 'dee1gnod to support fOUl' tons ·nna 0'1.'1ogce 01 ~~:~s "Yl>" muit. o!thor .be .0)(,-,pn!!s~d .or r~einforcod .it' tho. '1.'01\1.\e .:r.:ro to t~eoom-__ ;~;.,..·,.. ~l'\nn4""" +-..-.n--f'.,..i:n. ... !-:t.~rt-..nnr\,l'\a.1'1,..-n.('t\_· ·,_· il1U'-·U;;~\IIo1 .,1.~\.IIO'oltol-'-14- "·'-~.,,._,,.,.,.,.-' .~";..,.. .;or.:~•--·~.,.,_--.•:"!"· '"':'' •

(2)

"._,

,_.~__., .... ,_. ~"~-~---oi.'lo. b~:_ ... ~··_o:~'l:f.;,_·,.~+ -~nt:\,~,_.~bra. ._i,;.,_ !1"'-".-."-·-A 1i~U.1,UO \1llUV£'(i.J..L,Y "1./ -"''"" ..,v, .... ~~.:"!'J_. to'""' !I' U~U·:·-·.·-.. _ ,- ...

_whelf_e ·oUt-a· Wth"e n·e·oe.aat'f. f;J:-;grn- 16_ :~?: '18--j·o-9:t-,

Ti'af.fi0,n'b1i~'t·y -~~hG _j·tt.intcm_c,no~.:_, · .... tl;mes ai:t:t~oul ~ d\li:'i'ilg tainy

.fairl-Y good oond1tl.on; .. ·

"Joh1oul~r· l'~~ee_ns-o spm~ Beason •. RonC is-in

·1/r;X·trr:.U.rn -~P;\;·od.:: eo tO 2e mi'i'O$· .per ho't~-~: . '.·

Grndc· and curvature: ' 11£\:it:iQlum ·gt'«.Q.J.cnt 'petwc;-an_ ~HUNCH_' ON FJ.nd ICH''OH 1.e .Ll? to :t.l.f>'; and. min~mum ra~.ius of ~;~,..ut\t:u~-n r.f' AA f'Ant ~- With -mnn:v ·:steep aat>untn1n ou:rvps • ...................... ., .,._ ~-. ----, ' ' -~ .•

'(3j Route B

Leng-th; 65 miles.

't·71dth;

Trr~fficnb1litY -~.r;d. H~.intenanoe~ _ Vehiculf',r p::tssngo somatimes difficult during ±ttl;tny scne_o_n_: ~o~d 1s in rc.f~ly goo_d ., o0nd1 t1op,,. .I-'~x1mu.-n speed 16 to 29 mi.~ es · pc:r hour,··

G-rt~do E'.nd curvatUre: m1n1,iaUm · rndf.us of

.. ,,

' .-' '-·, .·.

l!".iimum P.r"ll.dicnt lil2 .to 1.15 ~nd curvat~ro ~~ ~ rc_o_~* . '


\.••·

DECLASSIFIED - ~ .. , __ '• .. _,_,,.--

5.

(5)

Longth1

•.J1dth: .

. - •.' ' : . . "· rr·ruff1·cnbl.l~ ty v.nO._:'l1E-'-iht:e11EmOEli Vch1Cuifl t -~_r\·6St;60 C: iff1~ · cult O.url.l\g :rain~ aoveon, iJlhU rohil. is in fairly

goo~- oori<l_i Uon €ltOej)t ~there noted on onolosmcc (1 i.

ltoutEJ D - CHIClPOt·!-NI (CT eo6ll4i: · ·

8150~5) to the ,,rest vie. !G-OK

' ~r~.ff1cnbil1tY nnd H~1ntonahco: Vohioulnr tr·nfflo d1:!'fioul t- aur1ng :rainy season.- Road is in f"air pond1 tJ. on nn~ .. htH! -n~.a no hoavy tr~ffio recently.

AhiL:=toADS:

n.~ At the :)resent time .ther:o: ·nto·ho .ecrvioct',blc ra11l~ofids to tho Divisionl s immcdintc f~Ont:~_ .. '~he r~.llvonO.a 'ln tho Di'ViSi-on·t s zone or r .. ction, although ~-~~--:1.\Q'-( ~erv1oeriblf;t; w':tll be briefly diaouepc

I . !

b. .;.. number of rail, 'll1noa· converge_ __ on_. CH! OR~TON._ .. 'Tho 42 mile C!JI O"t'ION ( CT 4334) - KUHH'~A ( CT: 6538 j ~· 0H t ~i~<1!:iO-R! ( C't 9463) . . cl·cotric rnill·ff'.'' 1.;! ·!)ro'be.'bly non-6pere.t1onnl, The extension of thi~ rail~1ny ii-·om·_ CHi.A.NGDb-R! 'to NAtKU!J!G.(l~~ ,(DT-.18?3) ·'t<ta.~ ribanOoneU.- 1n 1945 Vhcn it "ms rO!JOi~teO. ·that ~he· roils t·r.e~o re..rnov eO; :- ·

c. '.:'he BIDt'L - CHUNCifl ON :ra11f.oad 1-a· nOn-opernt:ional ~t.t prt::sont duo to Cr.-~mtgod brid.ges. However; it is rc,ortcG th~-t UN Fo:rcos int~nd to r·c.etoi"'C tb1a :re.il·ron.a. to·· opero.t-1-ono.l s1;r.tus in the noar fllturo. · · ·

]), Dl.scr.sos: (1). \rq,cto~s· o-·f d1·s0.Et8C --D;ro·:·:riumol-;OUS iil'i·~··-inclUdQ mo9'q~t1 to_o.s,-~

tiCt~o~ ·lico1 -'t!oke~ u~1;o:r a.ne.ile b:nCLrod~nts•

. . ' .. "· ; _.,, . fl. ice,

(3) common .. ,... 4

~ _, '

c.i t -! ·• ;:·' .,

_, :-:. ___ ;_,;~;."·i-f:-;_"-,

~;;;··r~,:ri.j~;dt!:-:~~J~,~~~ :4-i'i~:·rnitif·-~;_:: 1n.Ci .ASSil~ h.u


DECLASSIFIED

·'.

.( ' ' .

('\i) Vonorenl diseas~ is w~d~eprDnll,

. (fi) A Bnd6P.n f'11lY.fl· un nf" Rtljdnmln oro 1ouan-bntvl tvnhua ,P . .-.n:...M 4.., ·~:..~.--- .. ~,'~- ..... ~-~~~\--..;;:·.~--, ~-~~-~~+-::..- ..,;:.~~~-;;:.;·~~""; ~ A"4 ~:::..::tl~;, -~,;'1-!~~"t:, ~-'~""'"""'A 1'- ,YV ..,,. ___ ....... ~-·~ u _ .... w.vvuu .... !"'.._ I;.· to:• . .l'l.""-l.ll "'g;-, '!'o'V~'""""U .. J-.-<.e>.,"'"..., .,._..,'Q.,.~~9-¥P :~u-... -.v.u_ loO'.i,.,..+;v~"?"

.· thr·ough- the l"~c.s~Jii•tl,t~ry' tl•e:.et; (!)1pth~i;1a-;· o:ero'btv,sp:1n.nl 'n'ip:n1ng1 t~$, sctrlet fev.~r. sm~'-1 poli,: end; .other&), 11re lt\)6!1n :t0·•bi! j;>revr.lent, , :I

.,

· T.he c.o.m~o_n -house ·flY l. (mueof.l. domoat1_on). 1a 'l)rPV8.10rit; It is v. n10ct-~~tticc..'l oart1e:r 'of' in~.~a~:tlnr~l:-,d~scaeca ·p.nC1; diser.ee_s of the eyes;- .both. cond_itions uro vety wid&e1irettd, ·snn~fl-1es·;. t1)1ioh trnnsm1t 'thc·v1rtls or a~.nM'lY .rever, may i>~ founcl. l.n smnll numbers,

.. ·'!lh~V ArA v~rV omnll And Mn nel\etroate .cir>di·l)!l.l'Y .ffiOSOUito nc.tt1ng, ._.,. .. ':'"., ---~ . -- .. --.------ ---- . '-- ..... - -- ·-. - . .• ·-

'' . Several 'spcc1e·s ··of .fleas nl;'e .. foul)!i. >~li

1mport~.nt 'being: thd ti>op1cal· rat flee.. (xonopayl'!l.f\ :p:r1r_c_1'P_f·~ ,.y.r:c~o:r._ of ~~·ngue. __ ,_

. '

i-- .t·ect.'btj_gf? ·-ej•o .. numerous~ ·,' '· ''

I>Ol'CE\ 1 the mbe.t cheop1 s) , tho

. T . •· .

-~- : 1 _ ~~~o, r:lei0Y.''~(?us~---~ped1o~tU·p_~-~~~~~ri:!-~---~~lJ?Of~-~! .. ~2:::::e t~ci E\ll:ont of e·.)it\omlc typnus aver; nnQ.li~Cep~~~····~.v~•·· ""Y"""-.,vn'"·, , r~.lapaing fever is cnuilod by the. epirocheto \ oorrcun roourrenns}.

( 5)

~ho mo~t irnportr.nt. ap·o_o~~e !?I_, m1~o in~ ~?r-ca ... ~P ~he __ arne.ll ,..~d harvest m1 to, ( trombia.ium ( tromb1cUle.) aJtrunusnl}. HS . .tar·vae ~.;.r.. ,..,ll.,..t~~it:1n t\Yl vAr-iouA rcdents r.ntl t.re veo.to:rs ,of tho oausat1ve ;g~nt~cr-a~ruo ~typhUs~--The 1t~h mite (e!l.rooptos f;Scfibio1): the cause of acabicHil, .lu t~lso provalent.

(6)

Tl~c; Cog anCI t•rood. :potential vectors of disea:se

(7) 11ollusks:

ti-ok -e.:re pre~ __ E:Jnt,,.-is inaign·if!·oc.nt.

but the1r role ns

Sovcrnl species of .-\lmtc.r.·:a.rtail:s--n,l~:o :tmnot•tnn1L ns 11ltermcc~iat'e -hosts of \Jfi.rrs1-t1o· f'1ukcs -1.-nfeot!.ng man•-- . The ane.~l (katayr.mo. (oncomoil'.ni ~_; nosophOYEf) __ ·oat\i~:ee .. ~~le. ;~o~oc~~~f'·~ ... ~!. !-~e ....... A· ~ol'1entrt1 bloo~ flu.ke ( SOh1StOaomet· ,]EtpOl'l'l()\,\ll)), :j•lc.t·~:nle o•w1~1•.~. ""~

ti. i11:>ert1nn oo.:r:ry tho ocro~.rifle o:r the tnta.sUnnl flulte.

(a)

Ruta a.re ';)revnl~nt,.

DECLASSiFiED

·.-, ---

: ' '


DECLASSIFIED -. -. -.-.,,;~~>"'i""f'"·""'""'""'"'"" '<•oj'"'' ;bO'>"'!I'f"'' ---. . . ' ... ,_ :;'0"'';,'' ~~~ "i·!p~~;. - .

I . !

( "'. -·-: --,·.

•·' ~:.-

··. ; ...

oornmon bl~:~.ck ho_qec t'!l.t, brot'{n- s_ewet- -:~~._t·(·--~-.!1-~~- ·r90·t"_~rt?-t~--- :Aa ho~t .t.? r1eras and mitoaJ tt..ta: _ppfe~d. ._plagUe;"\1\Urr1-n.eA·en~yrif!C) !typbUs -fever, scrub tY).?hUe_ nnU tYl)h~~_.fevor.; --~~et~-~-~r-~:-~~~o_ ~loS);·~· to :~\>f£\~1' tt\~)cworms r.ncL ot11or pr.re.e1pQ· worms 1110lUCl,lng :~t'J.Mln<\lU\ sp.1rnl,1s, Their b1te mny .caueo r~.t-bl.te fever. ·· ·

be

(9) SnakeS· v.nd !naocta:

T>IO epcOii"S ratl:\1, ~ bLlt M ~. rUle

.• • _ _··1 _ '·_:· _·r •.. _- ,_ .-: .. _ ~J N: pl1i ,·v1]:le!'ll IW~ r@01'1i~i, .Tn~ the lJOilloh 18 t)ot v~i'y po'!Jcnt,

' Poisonous· ~co:rp!on·a,

. ,.,, ;· .. , t;:'hc t1ger,

in the mountf-·d.ns. 1 ynx .una · ~-rol r mny

{11) Poisonous pl~nts:

'boon

·~he common·cr ;o!~Orf~liEf ;·Pi.dnt~ :~liter -thqrn-{'.PplO, .- mool~ (or_ I!ld iHn). 'bct·~·-~oa, _ g;;•aen S?rz:el t · t .. ~~9~a-~;_~~r~ e.r.~.~~~m~·-- ~~-?~~-~~u~1 ,_: __ ., wolf onno ~£l.oonltt,.m .KOr'0f',n!-llll)., nnu wnJ.ve neJ..s..e uor•e ~vei'tJ.\tl"U.Ill uJ..uLuu,,

Poisonous· mua·h~~-6~S···~ls6 ·:·-ocot,J._r,- --tho m·oat -1mportnrtt. or wh1ch r.re tho fly a~erio {amnni tn m_uscnr!tt) _e,nd. t..~e {lcP.dl~r nh1E~.n!.tD. (e.mv.nitn phr.lloiUca)·· ·

·(>'

\'he snp 9f .the lacquer tr~e i !'h\.\e. vcrn~c1:1'ert,i oc.ueos a severe cLcrmnti tie !'tcsem'bling th.at ·o'!' ·po-t_son !vy .: -·'!'-he· Vf\_.mieh-- ie. aDpl1od to wnny urti.clea nnd. muat be e~llol-red to ~.r'y f¢:r · ee\~eral·· w'a.eka ln order to lose its 'toxicity.

7.

____ -~~~ ___ T!~o 1:x·inw.~·-y Pf~p~r~~ ·defe~ soS_ ~~E~¥!·r-~ t? ~ P_~ ~~l~5'lg ... !h~--~--.;...-· .. ~ li'VAUH. 1 0}! _-to!\.0. on . t:ne ·n1gn g~ouno._ 110 ~"uu .·-.~~~-~. ~u \..i,:'!J ~.tu~ ~~~ :-').J.;:J_.,,.vA-1ml\hlv 1000 vo.r<l.e, Genoral·ly. sp MUng, llll~ ,qerona1:ve v!l!lllll~quo;· +,..n,.'lt'.h- Y"itlb,Tt"''l"loL (H~Vr-t'nd Amnlnoefnerits. and aesOOlblY· nroaa nro Of .::~::··::·_:: .... .:;.::;.~.-:;:' .,;;;- ~~~;;..; .;:;,~;:.Y>+.'~A- .-~ i nt:-:MF1,.;in~ ni'-riAion Pcro1ocl1o UUI,; Ct:\llll;' ''~''-''-".._...,_ ,._,~ V"' 0"'"''"' '"""l._.._.. ... v...--· .,.. •• -.,-- ···.·----- -~·-----_- .. -·· --- h" tntolligo.u-'u. R(...'lJOl't -Fo. l58 of ~9 l·~srch l9_f?l.- :tt ·fl-:?pon~s the,t t .... .QeO po·a1 tion s nrc d~cl.l'ying in nf\tUr.e-~ Q~cnu~:JE' ~~hey· ~:r<! a)ptt:rC:nt;~ ~~·~Y __ ·:i;., ·.fle.nk. .Bnnnoel bv a· detcrmtnoo roroo tne.~e C!el·cnse~ wou.1.~ ac.o uo ~-n;,;.,,..1c;. ~" nur· ,di;r,noe. At 'the ·umo t>f t\11B<:Study,·phQtO"gl"l:\1)l1Y :·1-.::-;:- Ui:;.~;~UI "''~T ··;,-n~ h,..,~ ~;m11 ~'h1 r.. ·~nd tinnAeoUontlv n -de:rens1ve stuCl.y ('\.1-.,JVYV '''l.n.v•• v•· ., . .,_, .. oo...,v ....,.,~.- ...... ~..--- w·••·: -~-•.----........ -~., .. · · · , -

of thHt rl.l'l:.f\ }lfd3 not been made ..

b f1nd 1 gl'nph

·'

(1)

'3)

( 4)

(a·:: 926166')' ... Two _(-2) covo:ree.. gu.n ~os~.t.ione., ecv~n- __ (-?) N-:·! poe1 t~16,ru~ ~.nO.- t:r:enohes· 'between, ·.I-ob.4 'ana res o:rvo 1_r.;

(C~ 020161) ~wo (2) AW positions r.nd tronohoe,

(CT 903155) o.nd trcn ch.

(0" 2?5160) Four (~.) A1~ positions MEl extensive tronoh system.

DRCi.ASSiFiED


DECLASSIFIED

.,.,

CO!'-:FIDE~!T!.l!J..

(5) (OT 866171) -Eight .(8) Ai'i ')Oeitions,

(7) (CT 8Ml?7) -Three (3) gun 0oosition$,

( 8) (C':' 86f:;1?3} Jilour (4) PJ:J po,a1t1ons r~"la trcn~hca. Lr.at tiu~ce (W) ltoms -conetit_~to t' Single dofcndod v:to-J..

(9) (CT 8Ml70l -Two (21 A1~ nos1t1ons nnd trench. . . . . . .. (C.~ S52~{)?} .=·r1v¢ {5) ~,rt1llcry yosition·s, _r.l!:Po9-r to bo Ole:: ROK --dC:!'orlscs~ · · · '··-- · · ·· , .. , · ~

(11) (CT 9%0C9) - Poaslblo AT gun j1.1at 1-1 of shM•p bond in rot~d .

(12) (CT S73112)

(15) (C~ · 963107) - '::.'hreG (3) At;i pot:l~t1ons on h1e;h g1•0und FS: of strc:nm Junct1on •. ·

{lS) (CT 97109?) -Seven (?) A'.! poeit!ons nnd. tr.-enchos nlonrr, r:l..U.ge botln.;;m ror:~d and stl'ee.m.

( 1?) ( C'i 9B'i090) - Six ( 6) A'~ positions nnt\ t-rmchc e on· high erotmd botorecn the t~to (2) stronme nnd Just s of tho j t.mot1on.

(18) (C~ 969086} - ltuu ~)os1tion on !•' side of tr-n11: OP on S siC! o of trf'lil.

( 1 J) (0\:· 959111) ~ O!lo (1) rll,rot p1ll-b<;>x, ollc (1) gun poai~ t!on, t;\·~c (2) .ll.'-;r pce1t1ons and trenohoe on S end of t•1d[ c.

(20) (CT 950106) ·- Possible d!rt pill.-boJt, tr<nohes 'i of stroe,m junot.ton~

( 21) ·( CT 960091) to ( CT 961097) ..... Fout' 'tronohoe ~.long 1~· aida of stt'~t:un.

(4) poa1t1one E'.nd

(22) (C'C 9f•60Bl) - Six (6l ·nrt1llory '>oe1t1one, unoool.lp10Cl, :· of strcEl.m bond.- at bn-Sti of 'hif;h~ eround. ~ ·

( 23) (OT £49120) - FC?~;:' (4) ~;'t_ill-ot•y :':IOB1ton~t .. -thr--eO }~i ;:: of rond, two (2) of >wh10h nppel>.l' OO(/U;,>loo; ono lLJ S rd' r·n~ll whioh nmoelirB ocoun1od. Two 12) aeot1ona of :;:.~~ .... ;:,.:_1.,_ ,r,~~~ ... ~•drn~~-~1 v nnr> h~H''Ii'll"'i'!d (10Dl Vf'_lXiB to tho S • . "''- vuv~~ .._."J.'"'J;-'"'....,~·-•••,.. .. ;---¥ , ........... , ··~··--- ..--· •-- • "· · -

(~1) (CT 94q112j -Two (2). A·~ poe1t1ons r.ml tronch ".~of' strce>m Junction,

.

(CT. 960101) - A,~r ,,~sittoh t~.t _:NE end ot long tronoh oxtcnd.~ng r·.-:)pr-oxlmc,tely f!vo_ hut:ldrcd· _-(600) yr.:rd.e to th0 sr·r ~

(26) (CT 9-1·6118) - UnOcrr.:rouhd ·i~~tf'--13-ntion, J.Y,f"Ubf\bly c.rru-:nuni= tin!'l atorego.

i".-.""' ,,.....,., r.Ar.. ... .,r.'\ t:'o;.. ....... lA\ ht·T ..-..i"'I"J'4'1-"-,..;,,...·J:I f1 .• n.~_ ~-·"'·· "'.-n.n_._h_A_._. S_E_ of. ~~r J \y_f-·_ t?"'.O:l,..,J.:-1--V/ _, tvu.a. \-..1 -:>-"' ~..-:"' ... """' ...... u .... T" •

V,l.lJ.f£',0.

DRCi ,ASSiFiRD


, .... \

( 26)

( 3·J)

DECLASSIFIED

·j ,.

" . ', ,. ; ' ( . . .. ,1':· ;.' ,:. . '1 : .-· - _., •' - .• .

(Co;' S2Bl20\ to (OT 940122) ;. hl'of'. ~-DPX'OX11)'<E\'t~l,Y nvo ·iiUnd-rcct {-6b.o) ye.rd~ .. ~.r!de · Oortt~ine th:r:q:~ ( 3) A1~' -uoai~ J.t.~ .... .., ~-1- hT' ,.,.,....;_q,..,.....,._,,.,. /Ot.JI.tlr ....,...,..a:ot+i.-r..ntt Jit. r ;;m" ·And-.(_,_<.-_, I.!.:I.VUD C\ll II.· QU1.4-) .. .YWO:.O ,....,,. "~-" .'·.':-','""·-"('..., !"~~·.,.,. "'r,; ._ ,..-;-:,~..,..- · ••••••

tcnsiv_e ti;'eqchos. .,. " ·.. .. ·· '• ' /. ., " .. ·:, .. :. :'-

i (C~ 92(>119) - A1~ 3,o tlHion H· o:J,'- :rc.;,o,' find Q.uo .y o{ .etrc;-.m jtmct!on ..

' •, ' '.

(o•r 922087) - li'iv_e_: .(5·)- ·diJ:·:~·::_:,ill~boxos ,or oovel;:'Gd. .f~un vosition.a e.nd trenches c:.long E-tt snt.Cllo covEJI-·ing vnllo"Y 'to tho ~~. Dofin1 t~ly so om to· bt;> o;J.Ci. ROlC ¢Qfc!leo _line.

("oT Bt:.:2i23) ~ 'lTJ.ungulru• ul~en bG:t;.;een roCd anCl stron.111 oontu1ne. f. our· ( 4 j urpll ery, o'osi tiona, . !:J?P'"'.e.n tl~. _ ocov:,~<J<ll one (l) dirt »ill"bo~; fivo (5) ;n ',iOBltlons r.D:d .. c,:tcbe1vc trCnoh sy·at'offi; rtO'"lY dug or 'recently used,

' ' . . . .

(3\\) (CT €45120) - :;·nre~ fii1C1 F Of stream,

(35} ( c~ e4Cll2') of l"lOf·-~,

• (3)· A~l po.dtione on high ground '!

! 36 l ( CT e3·a2o l ·F'our ( ti;) 't1-1ocn tu~· ( ?.) etreRirrs •

AW. poai·tions along. r-:tdec

( 37) · ( c~ !\lid

.... t7n·., on\ Ol)C>J. f".-1:.- ~

stroPm .. - TWO

{ 38)

(40)

(4.1)

(OT P09H2) - Two (2) A'·i poaitione on high gr·ound S

ii"!'T' ··R15l88\ - Tl'ronty~ont ·(2.1)_ n:rt~~lcr•y poa_iti.ona ;;;up·i~d; .·bel.iQvod to ·be ·old ROK d£fon·aea. ·

(o~l2i .-(c:r 812101)· ... -Tlrc, (~)- gv.ri-'p?.a~tione, · a~r-v:cn_·. {11) ~;_,J,.~r ?Oe1ti6nS r~nd exter1e1vc .treneho._s_ on tuo._ -{~-~ knolls ;.-,.1 of .briClge .~ ·These a,ppea.r to '-b~·- .. ~·t¥-.-~"i '~-~.cfor.ra·ci;S. · '

{ ·13) ~~'"' """;"; \ to" /!'!'!' Rl2109l ~-;-~~~e~~ivo ~r(,nch syatom . _\_":::.~~:""''~·;:-/·~:: ~" ;:; .... ..:. ~ ~-..,~.~-.-+}. ~·r ,._~rit.hr-_-.·-nnd·· n.·y.~rox1me.t oly e-ixt_y __ \.1 .L lt'U 1.-:ioH • ~uo.a. "'""""u .. ~._..,.,.,., , ... ., • .,_ ':"", ....... ~.':"-~""'.,. .. - ~-.. , (60) fo~ ~oleP. __ on Ntif aide•.·· '·· ,·,

- 8.,.

DECLASSiFiED


DECLASSIFIED . '~: ..

. ::r:

COi"FIDENTIAL

c.

A1~ position on 4111 tno1rol.cd by trenoh.

(16) (0':' c;?o149) -Two (2) covered gt.m ,_,oaitiona !:1 of stream jt>pction.

(47) ( OT 854.13'7'} _:.__,_ bOv;erea· gun po:s1 t'!on r-.na. tr~n'ch ~., of v1llago end stl"'~oam.

(48)

(49)

(50)

( CT 860122) to ( CT 650130) - Long tronoh pnrnl lcl to ?t:Kf;~.r River. ~>.un uoeition. P.\f -·,osition t•.nd fox holc!l on hig..l-1 erout1d .... !mm"'e~-1ately-to_ theE~·

{CT 8.:~51:33) ..... T'VIro (2) AYV positions c:.nd tr=cmohca ·r of roec1.

{C~ ·843135) - Pooa1blo ·or on .pDf\k juBt •1i of t"'ro (2) n") pos1 t1ons above.

(51) (CT 8~.0133) - AW ]10Slt1on $·!;a)~ trenches with firing bc.ys on rid[';e bet.-een t~w ,.. etrea;ns.

{CT E'2Cl43) ... Possible supplY e..rca.. ~o obsC;rvod moving just S of t.1.1a p'61nt. .

(53) (CT ?60133) - Foseible oovored gun position end trench E of trnil ~

(55)

(Cs:· S5?103)·and (OT 946104)- .A~,f :')ositions.

{CT 950120) - Four (~) m'tlllery uos1 '&lone. Previously rO'OOl't0d with one {1) 'OOBition OCCU\)100, !;'heBe ')hOtOB no;: ind.!cAtc three (3) of theee positions probt'.biy ooou:.Jlod,.

(56) (OT 94?166) to (CT 9t)Ol18i -Four ('1i Ail positions.

{57) {C'l' 915112) ·- Tt·.'O (2) A''J position-s~

(b8) (OT 8?208?) - Tronchea antl roxholaa,

(59)

( 60)

(CT 883087) - Op'en emplaooment on to;o of hl.ll and trcnchoe along ridge.

(Or.( 91B082j - Trenoht:B along ridge,

, ( 61) (CT 928073) - Poasible Hgbt AA ''oe1t1on, and trenohoe,

( 62} . ( CT .9430.64}

'(63), (OT 948089) ._Possible ilght AA: position f'i1Cl trenohOs.

Sec enclosure (2) for ovefl~\Y ot .8'bp.ve ~os1 tiona,'

DECLASSiFiED


. ·.! ·-!' . ' -~ •·.

---

DECLASSIFIED

f!-'J Ali'f'iON ;;:....:.-:: t'-.- ~ "

;~: - '

. APR 2 4 1951·

DA'rEA_,.. ___ ~,.~~~-~--~---.:. ...... __ ..... __ .... . DlSTRiBUT-IOt~ -------;-~----- ..

i' ;-'-:':_!'··· '!'' -~68551

-·-·:,

~ ["- ,, -' -. : . ,:·. DECLASSiFiED

. .

. .


DECLASSIFIED ;- __ ,-·-

• . .,_~- ;~--~:,r:r.:~;-';r ~imr;lf4'~r~ ~·~~ -·.: ~:~ey:')'·~~-:!. ;~-~;- ;·

~ --!leadquartera

oio lat J•1ar1ns. Divisi.Qn" Fleet He.-r:!.ne Fcl"oe

F'lcct J?ost Otf1ee, San Franol.soot Cal1torn1~

From: To:

S~bj:

ASsistant Chief ot Distribution List

Enol: (ll Subject Addendi!Jil; number of oopl.ee ae Distribution List

Enolo sLu·~o

2. EncloeL\ro (1) contains add1t1ons to l>eragra~>h pare,graph '?,, DEFEI<SES extre.oted from r:us;cK Pnoto Haport l~o. 117 of ? J.~pr:!.l. 1951.

DISTRIBUT!Ol~ LIST:

2 e 2 2 2

6 6 6 6

WM'< !X cor:')s X Oor::JS 6th ROK !J~V let Cnv Div 2nd D1v 27th BOB

lst Harines 5th MRrinoa 7th !.fat'1n~s 11th Me~rinee

6 .~.oe" Xl-1C Rogt 2 - let MT Bn e ?th wr Bn 2 h•t T~>nl>. Bn e 2 1st 2 ~ let 2 - lst 2 - 16t

l:ngr Dn Ord En flig -3or Hsd

Bn !3n Bn

2 .... Hq Bn

1 CHO 1 - Fl~F

!~OS l l - 2na

'

Div

1 - OG l - ADO 1 C/S 2 G~3 " - fi_:.d_ .., "\,l~ ...

1 !JlV MTO l -Div r::ngr 0

DF.Ci ,ASSiFiED

e:.:r~s:bop 9 A)?r 1951

on

4., ROADS 1 r.nd Intst'9ret•tion

COHFIDE~'TIAL

,1 I \


. '

~-! ;

f· '!;.

'"-,, -· i. .'JI -

o/o

EPCL.OS':Ri ( 1)

lie ad quarters· let Marine Division, Fleet M11rine Force

Fleet Poet Office, San F.r~>.no~eoo, Cll.lifornl.a

2: JPS: bo··? IJ Apr 1951

.ADDEND1JM !W. 1 ':CO !:<TELLIGE:!WE STUDY NO. 1-51 OF 7 J<l'RIL 1951 FCKIU.N COR.~IDO!\ AFb El1V!RON8 .

1. '.'nC!er parngrel'h 4, ROADS, sub paragra,h b, (2) 1 aM:

(a).Roed block oone1st1ng of a ditch aorose the road at CT 821094. , .

(b) An anti-tank 'ditch a~pro:!timately 91 ~ride 6()CI long extending acrose the roa(l at CT 837108, 1\oad is uneervl.oeable at this ·~oint.

'(c) A ditch is across the road at CT 830102,

2. ~·nder :)al'Eitre.•)h ?, DEFE~lSE!S, add:·

64. ;;11ght (8) medium gun emrylaoements a'o;>roximetely 181 in dl.amet·er at CT 812116 a:;:oear uno'ocupied,

65. Three (3) heavy gun emplacements a:;..,rol:imeteU 241 in diameter at OT 813117 a•)pear·unoooupied,

66. Four (4) medium ~run emplacements a,.,roximttel:r 121 in diameter at CT 815109 appear unocou9ied.

67. ~etwork of trenches and foxholes on hill ~t CT 810096 8.))pe!ir unoooL1pied,

69. Ap)roximately eoo1 of firing trenohee at CT B44l32tare unocoup1 ed,

. 69, Nett~ork of firing trenches on hill at CT 840128 1s unooow;ieCl.

70. Net~<orlt of firing trenches in vl.oini ty of CT 872150 is unooou;>ied,

' n.. l'ot\'rork of firing trenches in v1o1nity of c~ 875150 1~". UriOOCUO)iSCl,

?2. Nct;rorlt of firing trenches v.nCl foxholes in v~cini ty o{ CT 923167 appeer·unoooupied,

?:3, Six (6) possible medium gun empi~.oementa 10• in diameter' et OT 91?.164 e.,,pet.r unoccupied. · · , .

. \ 74. Trenches end foxholes in vicinity of C~ 930l'l2 a:>:) ear,·

unoccu·.)ied. ·

75. Five (5) vchiolos on road at CT 933164, Direction of \ .movement could not be determined.

Dli:CLASSIFJF:D

~ J i


----DECLASSlF!JW

• Headquarters

Pre;cr:d by G-2 Sect!c.., l&t Marine Di•ision

August 1951

~\ ~.]~?) vL---------------------------~

DECLASSTFTlW


~:

SECRET

1st V..arine c/o Plod Post

DECLASSlF!JW

Headq-utirlR:r;:; Division, Fleet Marine Force Office~ San Fra~cisco, Califcrni~

·") f'f•l u !~ ... -.... .... , -'-"'"I'-'+"'

Ser: 00334(B)-5l 7 ll.ug-ust 1951

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1:!B.SlC Korea .... ,-,.... ............. .s..; ::;~v,vvv JJK.S L751, i:lfiC8l.S 6728 I, 6728 II, 6828 I, 6828 Ill and 6828 rv.

Area Cover-ed by ReporL; Bounded by DT 0802, D'T 0825, D'l' jj2j and DT 3502

Enclosure :s: (l) (2)

m Sun and Moon Data for August J 1951 Strate?ic Terrain M2.p of Y."J\TGGU-INJ'S Routes of Communicat.j_on Major EneJW Routes of .Approach

:.rea

1. IN·T·R6Dlll!'l'lON.

a. Puroose: The purposo of this report is to present an analysis of the weather .md terrain~ duri!'l.,q; the curr!:!nt period.: in the y;·.NCCU-INJE ,',:rert and their probable effect on en~ and friendly operations.

b. !.rca CoverGd: The area covered t"enerally includes the present X Corps Sector south of: b'..tt io;_clu.-1ir.g ~ the ',nCHT'T'/, r.n'B to a depth of 20,C•:JO meters.. Thu place name y;'.NC'.CU-INJE was selected f"!;J_r. inclusion in tho title of th.is report sinco t.1i.i:So:::: l'l.J',:; th"' t.-....ro l~.rgCJst tmti-:!s in the ar~a covered.

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( 1) Th(· 'bru;:J.r.l, currcr:.t Divieio~ mis~io-no

(a) Prepare :::or cl:lploymcnt on either the, IlotUCHGN-INJE or HONGCHON-CHU~'CHON llxis.

(b) Prepare :for tactical movement into other than X Cor;:>s Sector for subsc-que:nt e;nploymcnt as ordered.

(a) Th~;; J;LVJ..~lon mission in thC Y JIJGGiJ-ll\JJ.Ji; Jl:rea, if so employed, ma~-- be derlvcd frbJJ::. the mission stated in subparagraph c, (l), (a), above, as: Prepare tor enployDent on the HONGCHON-lf:'Y.\NC'-NI-INJE A..xis and th.::; HCI·DCHON-iJM-fiJIJ(;...f 1--LJ\.'(',C-U il.Xis.

(b) 'I'tle ··accomplishment of this mission, if ordered, w:Ul involve one/or more of the followinr general confiitions:

(1') Reinforcement of X Corps elel'ncnts in t..~a v-idnit:.,- c•f the Kansas Line.

(2 1) Occupation and defense of secondary ~ositionR, <o.g., the 1'lich:ita or S .. 'itch Linus. (SP--e ('.i'lClosurc (1..)).

(.3 1 ) Conduct of cou..Jter-at.t.n( K~ again!'St enemy- penctrG.ti-::m:::;.

(1) To defend to t.h.=e li!£!.)cim,~rn ~...-ith force6 currently er-..gagect.

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(2) To attack With two NKPA Corps now in contact, reinforced -.. d.th one or- possibly two additional NKPi. Co:r-pa ..

(3) To att<.td: throurh N"'r( ForCioli:i wiLh t:ltm~t;lnts of an urd.d~ntii'i~d CCF \nny Group,

{4) To condur;t limiter\ guorrillo. and air· activity.

c. Reference Materiel and other Sources: The sources of tho material used herein are l~sted below:

(1) Map 1:50,000, c'.MS L751, Korea, 4t.h Edition: Sheets 6'128 1, 6?2$ II, 6828 T, 6S2R TI and 6828 IV,

(2) Photographic Moai'!ics 1:25z000 ~'1-!S-FE'(! 1051; l$t Edition, Sheets:

6727 I, II, NE, :t.W, SE and SW; 6$27 I, II, III, IV, NE, f.N, sE a.'1d :JV'i.

(3) Vir.ylitc Relief l-b.p: 1:250,!'000.!' Sheet NJ 52~6.

(4) ~-:ap 1:.250,000, .'.MS L552, Sh~et NJ· 52=6.

( 5) RESTRICTED: prBpared by MIS, rn:;, 17 i.pril 1951.

(6) X Corps PIR No, 309 of 1 August 1951.

{7) Engineer Road Rcconnaiss~nco Reports.

(8) X COJ'1'S ltr, SECRET, AG 686 (18 Jul 5l)c, subj: Location of' X Corps ,\.irstrips.

i. .Speu1ng 01 l..t~ogr-dpn.to ~~<mH:lsl Tht: l:ipt;lliag of pla.cv nar~K;a is the same as that contained on .'.MS m~ps series 1552 Korea., 1:250,000, lst eal.t.l.on (/~IS 1) 195C, On -r,hese maps, names have been translatctl in acoordf.!.nce with the McGund-Reicnauer eyatem. Japanese forms of KoreM names arc snown in parentheses and ar~ transliterated according to the Hepburn system.

g. Sit:"lar Stu:lies: Tactical Studv of l'leather and Terrain of M;iNI);',E-RI l~rea, Sea.:tct, dt<'l 4 July 1951, prepared by this Headquarters, is complima_,l'ltary to this study in th~tt. it cover:"! the a:rea. to the immediate north of this study.

2.. GENER,'J.. DESCRIPTION OF THE ;.RE,l.

a. Clilr..ate and ,!leather Conditions:

(1) Storm T:J.o·-pi) s .:.nd Frequency:

(a) Frontal Storms: Unfavorable weather over Korea is usually associat<=d wi. th fr~~,nt.co.1 Aet.i v-i t.y ertw:;;::;;i t-.y t.hf": i pt.er-rn::.t inn nf di ffr::r-i ng ai I' masses, or by the pas safe of cyclonic disturbanceS across the Korean Peninsula f-tCJrn North C:hin;_:;_ or Ivb:ngol:!.;_:; _ _. Th+:'' atQrt!i. o:.onrlit-ir)t!S a.c:eampanyine t.h;;-:sE• frontal movements A.re not ordinarily severe, although very infrequent gale Wind;o< .<on~ t_,-,,...,..,.,..,t_-.f;'li ..... .,;,_.,_,. ,.,,,,_ ,.,,..,...,,.,.. r,jPii-r1,-.T;n,-.r1 f"T>n'l"\t_ni ... t_.-.,...,.,,. .;.,~r<>"inn . ---- --~--------- ~--~--· ,_. .. ,. ----4· ··-- ---~------- ··-··-··- ---····- --·---· ~r;egu~~r~ b~t~ccn ~a~ch ~j ~to?or~ r~aching_thcir_~~ f~equon~y an~ ..tn~<o:ns::t't:;r 1.!1 JUl.y anc: ... ugust;. Mucn o! tnc near.Ly ccntJ..nucus t:act '-'m:::.t.ner c~ midsummer is caused by the cl'evc:loprnent of a .S_emi.stationary or slightly fluotuat.i..."1g front.J.l zone between polar an.d mariti;ue: tropical air masses or be~ tweon maritime tro;)ical and cqu."!.torial air masses.. During these st.or:ms, Winds arc ordinarily moderato, low and visibility poor. disturb~l.!.lOe.s occur.

although rainfall is often heav·y ,_ a.eil+ilgs d.re ·v·ery In the winter only a few weak and brief frontal

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(b) Typhoons; Typhoons affect Korc;;. once or twice <:, year on the J.vcrarc! and four ui' fivu times n yc;ar •mcter e:x-t.r-..s:m~J eonditions.~ Tho:<y ''"'Y occur any timtJ between curly June and :mid-September, and :nay strike across Korea ctt ;my noint.. o-v-er lr.Jrtg P'=t'iod!:! 1 the Southwe~t coastal region is !:'.orl often affected. Typhoons are attended by wide-spread lm.r overcast, torrential rd-.!.ms ~ w-i..rld .sp.eeds above sevcnty-fi ve (?5) :r.i.les por. hour :mel in the oo;:;.st.'!l area, by very high It folloWing tides 11 ~

(2) ~: In the Southern T/...EB."tEK Range, surface wind directions in the enclosed valleys are c;;...-ti'c:mely variable ar1.d. the average speeds are very low, but, over the mountain QaSS as a whole, the prevailing winds ~re northwest i:n W:Llter <1nd soutlTwest tu ~ou.thedst. .in s.umm~r ..

(.3) fr~clpHation: /~.u.gust nomally brings continued m?J.Ximu."!! precipitation although usually less than that experiGnced in July. Korc~ lies within ~ne nonsoon bolt hence receives considerable precipitation ns the result of tropic~l moisture-laden winds drivin~ inland over the gre~ter part of the peninusla durine.: tho swrmer months. X Corps Sector lies within an area of heavy rainfall~ gener".ll.y averaging 15 days of rnin duri..ng :.ugu_st~ At least two rainy spells of two to three da.ys duration may be expect~._;cl with approxioatclv three thundcratort'_s normally t"'eCorrled 'in ;\_l.!f,UB+~.. Rainfa.ll rW-g8s froo,_ lO to.l6 inches durin~ Aup"Ust. It is worthy to note that the maximmn re.infnll ever recorded in Kor~~ in a sL~ple month tot~led 21 inches.

(4) Trt1fficabilitv: Milita.r"J trnffic. en primar,:: ro.:;.de :;:hould bt: gen~ eriliy unrestricted. Haw-eve.:..~, tr':ffic will be affect d ·by any bc~.vy seasonal· rains or fl.'lSh floods. S".Jd-".en cou.ldburs.t:;: :rr-.a.v t01'lporar:i.1y close ro.·.;ds while w~.shouts mrl. dam.at"ed bridges arc repaired. Under heavy rains the roads will become extre::ely slippcrJ and many by-passes · ... "ill not be u:sii.b1;:;~ C:r·<=>i'i;:i country traffic ordinarily is not possiblej however, should the dry season contirr..:w~ areas not :irrig,~,t.eri w-111 he f>A.>'<;:;r:;hle: /;ny flood wJ..11 r::.reate :m<:u'!.y traffi;: problems as larger rivers, suc:h as the SOY:.NG-G."\NG, present impassable ba.rrier-R rc;_t. flo<)<j st. age~ A 1 1 known ford si tcs woulrl no longer be usable and the usc of floating bridges would become a major problem due to increased wid.t.h r...•£ t.hc W"u.tcr g'lp a..'1:d the current velocity.

Korea; h~lv!~:i;;~~;~~ons ~~~g~!d~!~~~~~~~n~!~~= !~e0~~~~ht~~o~~. Cloud cover 'n'ill .~nrera;-e ?C/% a.-~ cml.y .3 cloudless days Jii8.Ji Uc c.11.pec t.o.::u uur .ing the month. As in July, minimum cloudiness is experienced ciuring the early night hours. Fog in the inland areas Mould be extremely rare and should not prove to be n limiting factor in visibility. Inland, visibility will be restricted Jna.ir.U.,~· 'u;-1 prucipitu.tion -:md. haze. Dust may prove to be a restriction nenr activo air fields. Eleven to thirteen da:vs of 1~um1st mA.y have periot.l5 of visibility of less than three miles, but many- of these periods Will be of short dur.:ition.

(6) Temperature: A.u.eust no:rmallv is the hottest month of the ve:lr in Korea.. 51Jlnnor temper.?.tures throughout K~rea ::J.re moderate," aver~gi~ 1~~;-tb~ ~?'the: United states~ However~ due to t.bc high ht:unidity7 the heat is some"t.J.lTies oppr-essive, especin.lly in thu lowland areas.. Relative humidity ranges' from 7(1/, to c,l.most 9Di~ '1\;:mp~r-"lt.ures aro in thr; 801 s during the d.e,y, f[!llir.g to a~und 70 degr~os at night.

(?} Sun ar.d Moon Dt~.ta for l.uzyst - SEle enclosure (1).

b. Topography:

(1) Relief: This areu consists of a complexJ mountainous structure "-'ith pe-9.k9 G!Y..ceedinR 1.100 meters in heif?'hth a,.,,-] v.~·11eys ;~.s l<Y..J c:·~ l()(l !Jl'-<t•_o,rs (DT 0809), a max:i.rrruffi. v.ir1.ant in elevatio;, ,of over lJOOO meters. See enclosure (2), 11strategio 'rerrdn Map; Yi.NGGU - TI.i.TF. 1~rea .. ~ for a graphic depiction of relief.

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(2) Stre~s and Rivers:

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There are one river and three streams within the ~rea covered by this r-eport! Tho SQY,'.NG-G .• NG C."td the PUK=CHUU, Ni~..IN='.::HO~ .:J.l:'ld SO-CHOU.

The SOYll~GiJ-!G flows southw-ar-d thrvugl'• the narrow v."'\.ll~'Y on the east ~d then at DT 2810, its course changes to the west. It is no~ally iord~ble. During periods oi heavy ra.ini'all, .iLia generally Ui"1for-dahle.

Tho PU'"K-CHOU is a stream on the Gust flank a.nr~ it flows from tho;; nor-th i~· a southwesterly direction to a confluence with the SOY;..N:i-GlJ.!G.. '1.'\J.c !ord.ability o! this str"eam will vary from dey, to day until the end of the rainy season.

The N:,ERIN-CHOU is a. second stret:rn. on the east flank nnd it flows from the south .in r. northwesterly direction to a. conflU<mCe With the SOY;.NGG,UI!G-,. The fordability of this stNom. is questionable until the end of the rainy season.

The SD-CHOU is the strea~m in the northwest section of thu nre~ coverqd b-j' tl"..is study. It !'lot-.'9 frO!:'. north to south ~'ld empties int.o thro. H:·f,'J!'HON RESERVOm. This stream is fordable in most spots at tho present time.

See enclosure (2),"Strategic Terrain Map Y:~U-INJE i~rea 11 , for l<)<;uti o:ns .:<_-n:l. onur>3t<R of t.l-.a ,-,bovo river and strea.i'tlS ..

(3)

the remMnts (~~ ~::~;~~ a~~r~ p~~~~1~ r~~;;~~a~n i~h~n~~~~;~(~I:~~~r ~;e. Cultivctcd arc~o arc conccntr~tcd i11. the V3.llt-oys. !n areas :~rhcrc no c"1tivation is ~ttemptc..d :--o.nd in crop lands th0.t have been aQandoned, coarse g:rasoc;s, &"lrllbs u.:nt1 sc:r"u.b pines p-redomir...stc. Tree type; n.r-f.; simul.:-:r to those found in the New Englenr1 Stat.es, with pine., fir, spruce, birch and maple predond.nating,

(b) Fore:st: 1ne fore~t. i~ largt>ly pint: w1u fi:i-:·. Huch of it is brush forest whi~ been cut over at least onceJ and the najority of present trees are second or third grovi:.h. ror t.ne area covereu w..Lvu Lr~::o;:;i:;i ur scrub ~rowth. see Map of Korea, 1:50,000, AMS L751, Sheets: 6728 I, 6728 II, 68'.28 r; 682:~:f II, 6628 III and b&B :lv. 1'hest~ nap Sheets h.o.ve recently been corrected.

(c) Cultivated lLrea.s: The cult.iw:J.ted areas are r'€Strict8d to the narrow river vAlleys and flat sections in the area.

(4) Surfttce Materials: Thoro is nn e,bundance of certain typos of field cons.truc:tion nt"'.tcrinl avniln.ble in this ~rea~ The stream beds Gonsist of stWd an:l rock m1d the hills arc densely wooded with tiJnber. The abundance of :r.:lture.l rood materie~s '.-·.rculd be of gren.t 'lssist~"10e in iJnprcnri....,..._q the prGs-enl road system. Tho nerrowncss of the road in pass areas and the rice paddies n.lcng the :road in the r.ar:rO'il valley:::_ present the ·gre.:!.tcst- tr.:>..fficc.bility prcblamS to vehi"'Cul.?.r movenbnt in this A-rea. The ruggedness of the terrain and tho lu.v t.r.-ct'fin<chil i.t.y nf -..o<c<'l5 during thG rainy season throughout this area would be a htndicnp to nny vehicular movement.

(5) Culturel Foeturos:

(a) Villages: The 1n<1.jority of vilJ ages in this area h.:we been

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(b) Roads: The roads thro'Jghout the area :md their tm'S"bccn presented in snc.losure (3), =:Route~ of

classification ... -----------~ ~-.1." ---" L·O!!!.<"n'..!...TJ.l.t.'tl.LL'='H~--

(e) u-<_. ... .,,,. The JnaJ0:-1 ty of t.ro.ils in th" ;:::.r~ .!'..re depicted on the standard, tucticr>l rrAp, 1:50,000, ~IS L751, Korea, 4th edition.

(e) Bridges and rords: -Thcec are dep;ieted on enclosure II Routes of Communic:o.tions" ..

;..,, \.,}) J

(f) Defenses: No positions or install:ttions are currently mrumeQ. by cnc.my forces in the area.

(g) ;'d.rfields: Exi.stinr- airfield sites in the nrcc. are presented Q!'l enclosure (3) ~ 11Routes of Corrmunicntions11 •

a.. C.ri t:ical Te:rr~in _Fe~tures:

Tho eriticnl terr:d .... "l features in tl'-.is .a.re-9. arc presented in enclosure (2), '1stragetic Tcrrllin M:>.p, Y:'.NGGU-INJE Area11 • JU.so, see enclosure (4) "llkijor &,e.;·ey Ruut<:Js of ;' .. pproa.ch11 The strO..@:Gt.ie tcr:-....in .fet".tures nf this ar0a.. are:

The llfichitn. Line is ~G:nere .. lly domineted by higher terrain to the :i..r:nediat'::"- north thereof;

The r:'"'",jcr -~venues Y,'J'.fGG-U and lNJE.

Tho H·.·L..CHON Rcsor.roir provide::: ~ r..:ltur.:::l b:>.rrier upcn '.·Il".ich tho west flunks of the !-'Tichit~ <'lnd "SWit.ch Lines ar+? anchored.

Thero r:~.ro two ec.st-west, cross-corridors within the ere e.. Them~ crur:s:j-corr.i.tlur iti fttJJlJ INJE westwar-d illong the trc..ce of the SOYi:.NG-G/,l\U. 1\nother cross-corridor exists imnediateJ,.y south oi the i·iichita Line along i:.ht.: eaet.-w·tlst road from DT 2917 to DT 1619. The western flank$ of other east-west, cross-co~ ridors lie ·on the eastern edge oi the nren. Tncse are: ~ns

POK-GHOU strca,"':"i flowing southwest to a confluence with the SO... y_:·.Nu....ci;.NG r"l-t U'.L' 301'7; an unidentified stream flowing west to a confluence with the SOY/J&-G;:.J\JG ::~.t DT 281.4; and the NAERIN .... CHOU flowing northwest to e .. confluence with the SOYJ•NL .. H..rANG at DT 2913.

Th•: m~jo:::- terra.in prO!l1il"''itocy i~ the ~;HJuthern extension of the T"~AM-SJ..N Mount.:-,i."l. of which the highest ri..dgelines in the are,'). project south~a.rd therefro!!'. ,<>~ong the 21 verticctl grid line through the Wichita 1).11d Switch Lines.

b. Observntion and Fields of Fire:

In gener~.l, the enr.;;rr:Y has superior obscrvtttion from positions north or t.k l;Tiehik. Lin'-'~ Obst::;r"'VCJ.tion fr-om the GGntral portion of the '-lichit· Line is limited dU<.- to coirllliBnding grol..Ul.d to its frontJ the broken nature of

~ t~~r:·~u;~e -~~; ~~~~rd:;~~i; t~~~ier o;~~~~\i!('~v~~~:o~:·<~F~!~~~~~:-1 ~~::_the ODrridor. Visibility on the flar.ks of the 1t!'ichitn and S-witch T."i't!e~ .1!:! considorP,bly better bocaus<::; oi' the nort:tJ.....south corridors. However, terrain to

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the imnedi-~tc north 0f these flanks cnn be nonn,"'..lly considered. as commn.r.dingt:row.xd, rivint. superior obscr.:c>.tion to the ene::rzy"".

Fi!jlds of fire :::.n:: nonr1.8lly limited due to rcctrictcd obsel""l:.ttion and rurged terrC>.in. Thu tWo cotTidora of approtJ..ch into the flanks provide limited exceptions.

c. Obstacles:

The rt".jOr obst~cl~ in the area is the ff{.CHON Reservoir. The strear!lS terrn.in in

·.,-":",,

P.ft.::::r hea.vv nrecipit['.tion will be an obstacle. .Uso, the rug,r;ed the ~.re~ will be .m c-bstMlc in thl'.t it. Will restrict novement. (2).; 11 :-it.r~p:d.ic 'T'crrr'.in Mn.p; Y.'.N!JGU ... ll'JE ,\rect11 •

Sec enclosurE:

d~ Cone~~l~_e-nt an-::1_ Cover~ The n~'~J;.t_t:rc of th~ tel"rr:.in nnd vegat.J.tion in the -"l.re~. 11fford exCellO:i1t Conce?.l.mont and cover ~t this time of the year, except :J.J.cn.,.'7 the t1.,0 m:1jor cerridors of ~pproach into thP. f1 '!nks.:; the cleared n.:ro:1s a.nd in the vicinity of towns.

e. •· .. venues of APPrO<.~.ch:

See enclosure {4) 1 llHajor .Linemy noutes of :.pproc:cch11 over laic! on 0nclc•SU.!"oi:' (2) i 1'Strf•.togic T,:;crr.c,in 1-1ap; Y!:.Nccm~HJSE ,~rcn 11 •

from the L~o~~ =~~t~;t~;~~~ ~~n~~;g!1·: 7w6~~~'1(n;n~oi~) ,w~~;i~~~~s~~c !"lai.'1 .<\Venur s of ~ppro.o;ch into the e019t. il&L;., of the ':lic.f"d.t.,-, Line'; Fu.rthcr southern pcnctr2.tion on this axis would ·be. along :the INaE-Hffi;GCHON Road, or,of lcs::::cr i.."nPort~.ncc, the li'.ovcl:',ent "'.lor.p- the road extending southe;:tst.l.'ro;cc I:·.i,JE~

The oentrn.l pn.rt of tho \.rca, in th: vicinity of the ·hcr>.itrc, Li."lc} is devoid of north-south ;-..rtries, except fOr foot trowel o.long ridp-e l.ines.

In the western flPnk of the area, two north-south corridors, c'lch containing a JIL:'1jor road, join south of Yj\1reU, p:rov'i.din.t£ the DD-in n.vonues of app:rottch into the w~C.st fl.mk of the 'llichita-Switch Lines~ It should be noted that another road, p!l.rallcl to the north side of the H'J .. CHO~J Reservoir, enters the •.Vichit-".-Sw:itch Linr:s anr'.. joins the P.bove north-south road, thereby providinf." r..nother, less import::nt, apJ)roach into th~ ~<Vichita-Switch Lines, Further ponetr.'!tion on this n.xis south of Y,'J..'GGU would meet the INJE-HO:r(}CHON Road, or, of 1 esser importnncc, would allow the movement out of the <~rea to t.hc west ~.long: the 'r'nqd pn.r-.Lllohn~ the !30YI.NG-G,\NG.

4. TJ~C'T'IC·T: EFFECT OF TifB i_RF.:,~

a.. Effect. on En•.;r.J.y C:oop:cb'ilities

(l) The he.:rvy r'"',infe.ll ,'lrtd red"Uccd ran.d <'-Tld ground ti-affi,~a"bility · renders <?. comparitive artvante.ge to the on:.:my, for his system of supply ·"nd tr.:tnsport~ticn dcpcncl.o f:J.r lc~o en hc..""l-..r;r motor moV8.'l1ent::;.. :2-so. the reduction of visibilitY will allow him a greater security in the conduct of .~round :ccti•.ritv bv sericuslv lv,..erin.-: our e.bili.tv to u.:;c ob:::c:r..r-"'.tion nircrnft. t'.ir strikGs¥ a.n~J observed- artillerY fire. ~ -

{2) The nature an:l predoodnancc of the terrain to the im2di<1tl; north of th~ Wid:J.ii...a. T.inu~ prov.iU..irw .!.L \'IC.Lt:; ~·.:l'6t'd by th<> '.:!H'-''llY., .,.,_,.).1•1 1-'''"' Lr.> b_j_;:;

distinct adv:!ntctv.·:,, from cith8r vic"III'Point of offense or defense.

(3) The "!1""--:.in corridors on the right .Lnrl left fL--mks of t!.1e Hichit<>. and S1·titch Linc.:s, lc:1:'"1lng 1.nto y;,NG·l,tJ G.nd INJE, f:tvor the cncrrr'J '-'lith reg:1l"'d to movenent into t.his area. The rugged terrain between the·se corridors, in the CGntcr of ttw aro,"l, is r.o.gged, rtascending mount~inous svurs extending south from T.iE.:Jv:-SrlN Uountnin. If the cndmy sould seize the 1.1Tichita. LJ..ns, it should be noted th<>.t an cast-west, c1~oss-co1Tidor li<:Js between th.::

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Wic:hitn Line -:nr:l the Switch Line in the central s.;;;ctor which would increase .. .. --- -- - . . - -- . Further southern pcnetr~ti•Jn (DT 2105), rosultinp in the

t..nD 'lllllC:U.!.ty or· -~ ccnt::.nu:of1 cn~my o!Tens~ve. fror.1 Yi.NJGU ;md INJE would COlJVOI'l=:t;; on UMY,.NG-NI further threat of" " penetration 3CJUth on the GT·iY.·,NG-NI - :IO!.CCHON :xis. Of lesser ir:J.port-mce, the un...:l""y could extend his penetrCJ.tion ;1.long the rocd cA"tending to the S(:ou.thc£.st of IUJE and from Y,':.NGGU :;.long the road pa.l'a.llclin? the SOY:cKG-G;'.J'JG to the west.

(4) The possibilit:y o.f ::m enemy fle.nkinp ::!oVe by crossim:· the lfJJ,·._cHON Reservoir is 13. possiblity and should not be overlookc.;d.

(5) Enemy usc of E:.rmor 1n nn att<:.ck on the ·~achit.:t-.::.'Witch LJ.ncs would prob.:,bly be restricted to the north-south corridors l~e.. 'inf into the Yld>llGU Area m'lrt lNJE, The west corridors pt;!.NGGU Are~·-) may 1\llo•.r t:x~ enemy limited lattcral deplo~mt of bh; r.>.fl"or,. Howeveri in attemptlne t." us<- his cumor on the Y.lNGGU-UHY;,NG-Hl :.xis, his am.or t<~ould be ro'!c~ bound upon enterill£' the nrtss Ptl'Cif! in t.hn vir-1nit ... r n-f ;}'1" 1/,1}," 'i'hr.t P!'l~t.r.o1"1"1 ~l"l'f-'l"i<""ll"ll" (Ttii,TF.1 ho·i"'.rm<'l" of t~~ t~~;;.i;--~~:-t h~~30Y:~G;.trG 1 -;;~d ;~~t~i~t~his -;;;,;~~to ,~--~~i~;;.~r~;:-:rrt..ation prior t!') reachll"..f the &.zitch Line. A subsequent sauthvm.r~1 thru.st of arr::.or fror: north of the soy,·~;JJG in th10 vicinity of UMY;JJC-FI would be difficult r~u:r.J.r.e thi~ n.onth unlc~::; bridges ~·:ere :-:.vnil blc for tr<"!.nsit of t...ltc river.

(6) Inclement woP.ther woul{l har'.per eneny rdr ·'!Ctivit~r, inclu~inr the use of cd. ;--bnrnc; t y .. -,.-,PR" :3ne:h W<::rttht•r woulcl; hcilli•}V;;;'r; facd l-i t .. ·.t . ., hi~::- er:tplnymcnt of guerril~~ forces.

b. Effect on Courses of /lction to ;,cco-:-rplish cur 1'-ii.s.;don:

(1) The weather, inclU(1ing its effect ·upon tr:"lffic1\bility, during .iu.pttst, offers m.:t.'"lj" di~,-:;.~.v~nt~fc::: tc r..ili.tGry opcr~tion <"-nr; ncy r.~nt"'.cic~p O'J.r forces with their depenc!enc.:; Jn motor transpo'rt mid ;1.ir power, depending upon t.."l.c dcp·cc of procipit3ti:m :;_nd a.ssoci.:~tvtl fact·'J:rs ,:-,t the tin,::;. HG<l.iry precipitation nnd t':>c rcsultirt..g flooding of lowl::mds would restrict usc of 'lmor, i.r:rpede supply omd troop movements a.nd seriously r·Gduce, for indt:fir)it.t: puriocts·, close air support, obscrvntion (from· OF's, .\OP's and tactic::.l <:.ircT.:'l.ft), t.'lkin1 of i'\\n·idl yhvt.ugr'"'.phy -:m · observ~d artillery fires. iJ.th6~h n,~in rooil.s will norm.1.1ly be tr£Cffic~:.bl-3, secondary roads msy be renrlered impn.ssable by flash floods, slides r;.nd wnshouts. Sudden river anti stream rises m3.y .~'.<:tr!tagc present bridging,mrrke present fords unusable and incre[';Sc the difficulty of bridr:ing. The foregoing ;ere possib1lit1e~ Which couJ.c'l be Gncountcred in /,ugust; thus, it must be borne in r.ind that extreme v~ri~tions·in nrecinit~tion. visibilitv. tr?.fficabi.lity <:m.r1 o.ssocintt.d factors, such as fl~ods," may occ\';.r. ~ J

(2) The tc:r~.in nnd \tle.,_ther in general could affect the reinforcement of X Corps ch'!!'l.cnts in the vicinity of the K~))sas Line in th.s fo:Jllm-.>ing respects:

sECRET

(n) Rugged terrain with difficult routes of ~ppro~ch, especially in l.ncleJ:J.cnt we.::thcr.mny rr.rtkc tho move.rncnt r,.f ur<its tc fro~t lines and the rcsuppiy ihereof difficult.

(b) Th<:.: nomel I .. ugust averc>.r:e of 10 to 16 inches of precipitation

:~. ~~c~:P.:n~~;u;~i~;:e~~:l~~ ,~f!:~!r~~:~io~~~~-:;cl:~h;~~=es .s-lhil"ii-.v nf' '"'""'hrv~ rmt h...-ir'iar'-''" """'"";..,;,., T,....,..,.;,. <:>n'"' iN.r ~·- --~--.- -~ ··----~- ~-~ -~--o--, -··-~~--~ ~~~~~ ~··~· -~··

trafficn.bility of ground nrc:1s used, other than i..!T".proved roads.

(c) Re:ducerl visibility an.-1 coverage of enemy ~reas by OP's, AOP's tactic."'.l .:.i.rcr.::-.f't nnC. :1crial photography, th·zreby reducing air strikes, observed artillary fires L!.nd observg.tion of his nctivitie:J.

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DECLASSTFTlW

,,


DECLASSlF!JW

·~ -, .-. ,(· SECP.Er 2/JPS/cfb

Ser= 00334\B)-51 7 l.uguat 1 ~51

(3) The terrn.in '1nr~ weather could affect the occupation and defense of secandar; positions. e.f- .. , tha \•fichi:t.<J. or &n"itch Lines, i..~ the f"cllO"->!i!" .. g aspects:

(n) Srunc as (2), (a), above.

(b) Some as (2), (b), above.

(c) Same ,. (2}, (c), above.

(d) Dela.J.• the construction of imrte.lltttiona, r~evolopmcnt of positions ..me~ the movement of. engineer equipment, supplies ..and orrl.nanee thereto.

(4} The terro.in Gnr! weather could ?.ffect the conduct of counterattacks against eneey- penetrations in the followinr aspects:

(a) Same ns (2), (a)' a.bove.

(b) Sruno ~s (2), (b)' above.

(c) &l."'l.C ~s (2), (c), 11bov-e4

(5) ;Uthough irlprob.-.bl...,, a typhoon or cyclone could seriously impair r'"'"to~ bride:o::si <:•q•lipm•mt. P.n"'\ F<UJF-,lies~ thereby seriously lO' ... -cring tht; cor.:".bat ability of the Division.

Enclosures:'

OFFIGIAL:

V. H. KRULi;K ColonclJ usr~ Chief of Staff

(l) Sun and Moon Data for ''Ufllst, 1951 {2) Strategic Terru.io Hap of YJJ.)('.GU-INJE ArGa. (3) Routes of Canmunioation (4) t·Injor Enemy Routes oi Approach

J,, ._,_ )"[1' ' ·~.\.Jr.~~

T. L, RIDGE !' LtCol,. U~ ACofS, G-2

DECLASSTFTlW


SECRET

DISTJUBUTION~

CG ;nc C/S G-1 G-2 G-3 G-4 Div MTO il.sst Div En..gr 0 FSCC Hiat Section 1st Mar 5th Mn.r 7th Mar 11th ¥...ar 1st KMC Rest lst E..1gr Bn 1st J<:T Bn 7th NT Bn lst SF En ..L~t- Ord Bn 1st Serv Bn l~t Sig Bn lst Tk En

IX Corps X CC1"p3 5-2, X Corps .\rty ~ncl In! Div IJLG, 5th ROK Di v 1<1-L--,G, 7th ROK Div l$7th h.irborne Regt lsL 1-H.Ii -COMNl.VFE CHC FMF Pli.C fti[F' Ld-J1' 2nrl. Mar Div 2nc1. MIL'.!J MCS TTU P .C TTU L.~NT

SECRE'r

(l) (l) (1) (l) (1) \1) (1) (1) (1) (1) (5) (4) (4) (4) (6) (1) (l) (l) (1) (1)

~ij (l) (l) (l) (1) (l) (1)

(10) (1) (1) (1) (l) (1) (l) (1) (L) (1) (1) (1) (1) (1)

DECLASSlF!JW

2/TLR/cfb 3cr; 00334(B)-5l 7 uugust 1951

- 9 -

DECLASSTFTlW


DECLASSlF!JW

RESTRICTED

SUN T.~IE

~ ~ ~ ~ 1 063? 2037 l 0429 1942 2 - 0637 2036 2 0528 2019 ' 0638 'JfV:.l <: J 0629 2050 (New Moon) -VJ/

4 - 0638 2034 4 0730 2018 < - 0639 .,,....., ..,

5 0831 2143 ' "'-U.)'

6 - 0639 20)1 6 0931 2207 c, - 0640 ................ 7 1032 2231 ' .GV..JV

8- 0641 2029 8 - 1135 2257 9 0642 2028 9 1240 2326

10 - 0643 2027 10- 1349 (1st Ql.larter) 11 - 0644 2025 ll - 1500 2400 12 0645 2024 12 1613 0042 13 0645 2023 13 1?22 0135 14 0646 2022 lh 1822 02.38 ~~ 0647 2021 15 1933 0351 16 -0648 2020 16 - 1955 0508 ~·, - 0648 2019 17 2029 0625 (Full Noon) 18- 0649 2018 18 2059 0738 19 - 0650 2016 19 2126 0848 20 - 0650 2015 20 21!)2 0954 21 - 0651 2014 21 - 2218 1059 22 0652 2013 .2.2 2?.46 1.::?03 23 - 0653 2012 23 - 2318 1302 '?.h 0654- 2011 24 .:?355 1408 - . . - \L.::.St '..Jur1rtcr) 25 0655 2010 25 1508 26 0655 2C08 26 - 0037 1/...nJ;. .... ...,...,.,~ 27 - 0656 2007 27 - 0125 1656 28 Q61)7 "~' 2S - 02.20 l740 .,._,1\_Jr_}

29 - 0658 2005 29 0310 1819 30 r-.Lr<i 2C)C.i3 ·z,-, G4l9 lf352 1../U~>O 'v 31 - 0659 2002 31 - 0521 1921

RNCLOSU7E (1) TO T;,G'l" G,~T. 3TUDY OF \.li'E.'.THER .. !'ID TEP .... !(,.IN OF

UESTRICTW

DECLASSTFTlW


DECLASSlF!JW

,., . ' - ... .... --....-..-.~pa- ..... ~~ .a.,;- r.--~# .J~c;'";a,-,

.Firsr JC,Ior~.ne .£>i,.i:.r .. ~~

~\ ~.1[::)) VL_ ________________________ __

--··-·~··

DECLASSTFTlW


SECRET

l st 1-larine c/o Fleet Post

DECLASSlF!JW

Headquilrters Di•risiOn, Fleet Iv:UrinC Office, San Francisco,

Force California

2/JPS/efb 3cr: C028G(:a) -51 4 July 1951

TACTICAL STUDY OF WEATHER AND TERRAIN OF MANDA;:;...:n AREA

Basic Hap Reference: Korea 1:50,000 AHS L75l, Sheets 6728 :tr 0729 II; 6828 IV and 6829 III

Aree. Covered By Report: Bounded by DT 0825, DT 3325, DC' 3:5'!,8 Md DT 0848

illclo sure a:

1. INTP.ODUCTION.

sun anc. i'1oon Data for Jul 't _Stro.t egic ~ erre.in 1"l:ap H~_I\TDAE't-RI Area

(3) Vegetation Overlay (4) Obstacle Overlay { 5) Eneml' Pefenee !nctallatl.ona (6} J.\Lajor Enemy 3.outee of Aypronch

a. Puroose: The :pU11JOSe of' thia r~-:~or't i;:; tn p·r8;:;ent Etn an a.nulysis of the weather and terr.::.ln, during the cu·c-,'f'~t neriocl.. in thP. ro:;:'P.MHnt ;:rr:;r;t'::r~-,1 ,:;,.-:--otnr' nf' ,-,nP.;-•;;_t•,,-,n nf' tl~1.::. iavis_iOn and th,~L~.-p;~b~bie er--.;;t -~n ~~e;Y-Md-f~i~~diJ~~ opeP::J,'0lons ..

b., .l~ea Covered: The arcQ covered. gcncr;:-J.ly in elm: co tho pre:lSe-nt battle area, limited from west .to eo.st to a short dictance beyond ·:Joth fln...'"'~1'>:s of" t~'le D.i· . .riaion sector and to n depth of 15,000 meters, The place name MAJI.TD~-RI l>TD.s solet?tcCl. for inclusion 1n the ti.tle of this report since that i,s the title of the principle 1: 50, COO map sheet of this cre:1,

c; CU~rcnt Division Missions:

(1) Organize and defend the Kansas (Bro;m) Line,

(2) Conduct active natrollinf!, f'or.\rarC!. of the Kansas (Broun) Line. - -

d. Enemy Cap a bil.t tieB:

(lj To def'end fran successive h1gl1 ground positions to the KI.n~G-ANQ....8AN (DiM~onc'l t.rt - Drr' 227B' .o:rP..cJ, tv1 t.h P.1 emf'!nt~ of tLc II and V-NK co,Ps BUp1)orted-by nn' uno.eteminei:- lll'OOUnt of art1lleryi :nean1>rhlle, regrou-ping n.ntl reorgexd .. zing preparatory to launching a counter offensive.

(2) To attack alon;, the axis HAFYON-KI - YANGGU, ¥-.~~JQN ...... NI-- !NJ2~ 11ith clo.!;J.ents cf the V o.nd·rrrNK Col"'":-)B supported by .an Undetermined a.rnount of armor B."iiC1 artillery.

(3) To reinforce Hith ele~.ents of the II nnc1 VII NK Cor:r S: plus other u..•ci.-etem.in<:d CCF n.nd NJC uni ta,

. (4) To 1nfiltl-.£Lte fri enc1ly poBi tionG etn•"'l e.onclu_;;t. guerrilla activities against rear o.ren installations.

DECLASSTFTlW


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,_

DECLASSlF!JW

2/JPS/orb _ Seri 00286\Bj-51 4 July 1951

(5) To conduct increased 1'\11" not1v1ty.

(6) To conduct 111n1tcd airborne operut1one,

,e. Rotor once materials nnd other aourcos: The sour,cee bf ·:;no 6__..tcr1Ul -uaod. l'lel"'-e.~:ri- -.:lrc .L~fH~da. oe..LO\oJ:

tween (l) Aor1a.l photogrnph.ic eortioS· Of this aren nown be-

15 M1'.rch and 1.JUly 1951,

· (~) ·Mnps·i!so·~ooa.· AMS L751. KOHEA; 4th E~J .. _t:!.on: Sheet $728 ! 1 6729 II, 682S IV. and 8829 lri-.

(;;) Photo i4osn1cs 1:25,000 AHS - FEC ·Lo51, lst r:tl1t1on Sheats 6728 It NE, SE; 6729 II; SE .. 6828 !V~ NE! SEt N~l & Si·J [U"}Q ,6829 lJ:I, SE, & SW. . .

(4) V1nyl1 te Rolief Maps: l: 250~000, Sheet NJ 52-6~

(5) l>lnp 1:250,000 A!t.S L552, Shaeos NJ 52>-6,

( 6) Term in Himdbook l!o, 66 of Northern Korea, Reatr1o terlj prf!Parod .'by MIS: FEC: 1_7 April l95lw

Sortie

2933-R 3463-B

1:1o,ooo. lao; ooo "ioln·nnn. ... ..._v 1 vuv

l:1o,ooo

Dnto of Coveruge

16 l1CJ.l"'CJ.'1 1951 21 April: 1951 30 April 1951 18 Juno 1051

(8) Acrlo.l PI\Ot!'igrc.1)h1c Intorpretation ::leports !loa; 9=51 of 2 Juno 1951_ to 21-51 of 24 June l9bl, lncluei vc~,

{g·; P.el"lodic Intelligence :L~eports Nos. 237 to 250, inclu.sivc, covering tl:c period 18 Juno- 1 Jn1 y 1951.

(10) Prisoner of Wn.r Interrogation to 1 July 1951.,

: ' TI.opo:rte from

(ll) TLO ::leports from 18 June to l JUly 1951.

(12} Aerial reconnnis acme co of' the nrca.

(13) Gazottcr of Kaps of Korea, Amy Map Sorv1oo, -sep.tc.J'Clbor 1941.

On ~hon0 r;;nps, :n~es hmte boen t~anslatcd in accordnnce vrith the McGund-ll.eichnuor system. Jo.par..ese forr.~.s of Kor.;,.'ln nu.m.os rt:t"'c sP .. m·m in parentheses and aro tr'E.nsll t~·ruteQ according to the Hepburn systcn.

DECLASSTFTlW


DECLASSlF!JW

2/JFS/efb Ser: 00286(B)-51 4 JUly 1951

An index of place nrncs is to be found .!n g.c.7.9_tt!.-9r. of !J!c.pa of Koren.

2. GENE:AAL DES(t;IPTION OF THE &"lEA.

n. Clino.tc Md lfentt:er Conj'litions:

(1) Storm tYpes md frequency:

(n) Frontal Storr.1s - Unfnvor.oblc >rcn~hcr over Korcrt is ueunlly u.ssocinted with front,.,_l nctivi'GY Cl:t~HleCt by the 1ntcrnct1on o i' differing l;lir mnssas, or by the pnssngc of cyclonic; disturhrnia eB aCPOHEi tl~e Kororm Penin;:;uln ff'ni:1 North Chinn or Hongol1n. Tho atom conc1i t1ons c.ccon'Jrcnying tho8e fr·ontr•l moverJCJ:lte arc not o:r.··,:cinnr:!-ly sevorei ulthon~~;h very infrequent go'J.lo winds o.nd torrential rnins r:;['_y occur. Hcll-•:lcflned frontE-J. stom.a: c1.cvclop :trrcgulr'..rly Uct"V-rccn March t>.nd October, ror..chlng thoir r::taxintli'J frequency o.nd intensity in July and .. ·~ugu.st, Huch of the ncurly continuoue bud uenther of mida1.l!:lr.1cr 1s oo.uscCl. 'by tt .. e c1cveloprJcnt of a ne::ist~tionnry or slightly fluctuating frontal zone between 1:1olar and nnri tine tropico.l air nnsses or between r..nr1ti6e tro_-;-:-lcnl cmd cqu.o~tot'1.al alr r:1o.sscs. Durlng these ston:1a, winds o.re orc11nar1ly oodei'ute, although rn1nfal: is often l'lr;.:-,vy, ceilings D.re_ ver-y low w"'l.d v1s1b1l1ty poor. In tt~e winter only n few wonk und 'brief frontal _disturbances occur,

(b) Typhoons - Typhoons affect Koren once or tl'.rice r. yepr on tnc nvt:rt'.e;c,- anC. four Ol' five tines a yeur 1mdcr oxtrroc conc::itions. They on:l occur any ti.r.:o between cnrly June ;md ~:J.1d-Septcr..bcr) ni1d ::~ay strike across Korea at nn:y point,. Over long per:i.ods, the Southuest COf'..StD.~ region is aoet often affected. Typt.LOons are nttcnclcd.. by vTidPffi"'rPnrl 1 m.r nv r.>:l"All!=lt torrPnti.i:Jl rilins. wind fffiCIE:!c-:.s t:'1boVe seventy-rive (75) -;;ii~S p~r--hOUr~·.md.~· :tr: ti1c coD.~Str>.l nl~oa 1 by very high ''folloHing tidcsn,.

{ 2) 1'lind: L'1 the Southern ~AE3.u:K J.enr:e. rmrfacc Y..rinel directionS 1n the enclosed vellcys itre cX.trcrJ.ciy VD..ria.ble nm.1 the c..vcro.:::re- sncuds- arc verY lo;,-r. but. over the GOU.l'lt.nin C1<1SS c.s a uhoic, --.~he pre•lnilin£; winds c::trC not'thwcst in wJ nte:r n.nd S<)Uth>ues.t to southe(;St in S:..EJrJcr,.

{3) Precipitnion:

SU..~Jner·· is the season ci l--le<:lVJi :r~.ninfnl1 througr!out Koren, ";ith July being tho nont-.1. nf grentost frtinfnll.

~~ {:~i~n~~~~ ;~li~n~ 7 d~~~~:s n n~i f~ ~~J ~~~~5·o;1 fi~c ~~o~~~~~t~g£: ~~1~~~1;o ~~h:l ~n n~~f~~ t ~no; h~oiilii~o~G~o. :in~t v.~e n~~;~~~r hoa·vy to torrcntittl 1n into.."'lsity nnCL rcr:-,ch their poc.lc;: in the niddlo of the.pcriod,

The rainy Sl-U"" ... ::1cr set"son is the lcnst fnvornblc periocl for ;-.-!ili-tnry uoVf'J;lcnt v..nc1 f~loo fo:r- aeric..l activity because of r_(1verse cloud. conditions associated with heEWY rc.inr·al..L·. HeaVy to r.1od.ernte rnin D.ny fall for eevet·v.l boUJ.'i at a tine, nnd neriode of intemittent rain r::u:~.~r last for sever~.l diys. Although the rainy scnson contiiw ... ee urttil

SECRET

DECLASSTFTlW


SEC?.£7

DECLASSlF!JW

2/JPS/cfb ffer: Uu286(B )-31 4 July 1951

nid--Septenbor; rninf<"'l~- iR ~n'":iparativcl:r light.: in th~t: C'.1nnth., Only in July .".nc, August co.n rninfnll conditions be roe;c..rc1efl_ [1_S <:'.. anjcr b...:..'1nCL1cn:o to nilitnry ·Jper.:ttions ..

( L1) ~rt>.ffi ctl.bili t:r: 1.11 lo'l.-.rlc.nC~ n.rens n::-e ir~ c.~-~l!'er of flooc1.ing, hence, vehicular trr:.ffic Will ger.ornll~r be confL1cc'":. to the ronC.ts. scconCI.~ .. ry rou.::ls will often beconc irlpr.tssable nnc1 prifmry rends i-1111 require dny to day nc_int;;no_nco nt ;,.;o:tk hpOtM; Slides and ;-;n;::;h.;uta nny ('JCCur nt ;;ny locnti:Jn v.rhcrc the ronc1 traverses steep slopes. Flash flo.oc:ts ;--;ay <~tl;;:;.rupt tr;:-,_ffio v.rhile repatrs nre off'octec1 on ;;.;n;;hcflt:-.ut bri(Lges 1 b;:t-oasses and. fords. Tho najority of cll flooc1s oecur· c"':.u:clng- July thus .oa.'l{:Lng ford.-!'! ir::IpassR.ble t:-.nd bri(\.t;-ing opcrotioEs difficult during this perioc:..

(5) V1s1b111 ty: _An a::erugc of Q ole':-~ cl.nys "-"Y be _ c:::_pcctcd in Ju.ly ;,'i th tu. -co eu percent c.Lou.a. covcro.ge nomru. during the entire IJ.onth. Stratus clouds constitute the nost_ frequent covcrr.gc. Tk:..is period in gcncro.l·ly poor f"or vicual "bor.1bing in Korcu.. Haxioun cloudiness usuo.llJ' occurs in the ea:..."'lJ" noluing l'lotu·s. Tl1ore is a tor"dcnCy -ror slightly inproved cloucl conditions lo.tc in the cl.D.y, 11:1c1. the lcnst clpud covor ofton. occurs aruunc1 IJick"it;l1t or shortl:r there-aft cr ..

(6} ':'cr.1Pcro.turc: The tenperature -: . .Jill not un:"'.l;)rgo cny npprcciable cn.-mgc ns August- is the nbnth of g,rea-tOsL heat in Koren. Tenneraturcs sLould range. during July. froo m1 uvcri'.ge loW or b2 degrees to nn nverilg8 n.Q.xir.:lin of bo c1cgrecs; 1vhilc the nights will n.vemge 65 degrees"' Al'?n~ the l'TONS.dN -- SEOUL Corredor the average nnx1r1m Sho Lll:.:. De 80 rl cp_;,..ecs ..

(?) Sun und Hoon Data for July: Seo enclo8ure (l)..

(1) ::=lelief'! Thia aron consists e·r e. c.or.role;{. r.~cUJ1-to.inous structure with p~1..~s excBocUng 1300 nefers in height nL'<l vr._ll ,-::;y,-. tl.R 1 nw i-;;; ?~?',n nP.tf!rh.A ,:-;_ cr-xiDw-:-. varl&nt itt ~levc>.ti;l;··~f ;V~~ l~-6cQ-net8:r8. ~see enclosure (2), 11 Strate-gio ·.::cr'!'<:-' . .!.f!

of relief. ;;t;.;,rn:..t"-7':T .1;.,,-.,.,l! f'nr- n _o--, .. ,-,-,-,)-,1" tiP.T,ic:tinr'l •• ., .... ____ -- •- --- :t --- -· u- -·~·--- -·-.l.-- -- -

There is one river nne. tuo strea.IJ.e within the <:trea covered by this rGport: the s:JYi\.NC"---'GP .. rG- ~.1vcr a.nc. t':e SO CHOU nncl the St'IP CROll Strca-,s,

The SOYA.t:G-GANG flo\-J'S throue;~1 the nnrrmv Vt>_lley vn tl1e east. It 1s ron.1.st.ble· at all s-oot~ '11il1ore tJ~e lJric~_ges arc out o.t present. Houever, \vi th th*e anti~pr-~tcc1 rnin fnll of July aild early Auguat;, tL.c fo r·dl "b111 ty, w-,til the r.iidcl.le of- August, is quest1ono.ble,

The SO- CHOU actually is two strcw:os with the s2.x.1e n£.r..e r:..nd nrea ol" origin, one flowing south f'.nc'L the other north~ The so CHOU1 s orirzin is fro~.1 the urr.ss nrcn rmst of H1li 872 (DT 178326). This streaD is t0rc4nble at t;,e present ti:·.te~

SEG?.ET 4

DECLASSTFTlW


SEC:\ET

DECLASSlF!JW

2/J'PS/efb Stir'! 00286(:8),._.51 4 )July 1951

The SUIP CHON is tho atrerc'l along the >rest flm1k of the Division sector and flows fror:. north to south. Thia streac. is ford.nblo nt the prcoent tine.,

Ree f':.nclnsurP. {?:). n~t.rnt~~in ~P.rl"'niD Study 1-iAN:CAE-r.I Ar8nn;--:fo; i~Cn·ti;I1sui1d C~UrS~s -~f-tt;~ Qbove river nnc1 streQTJB.,

(3) Vcgctt'.tion:

{n.} !Jc;:cr,:1.l: The hcc.vv foract nrcno in the Division Sector o.re tno rerr.nnn~s of ~...cc.es"tic ~.nc".. pri~:n+.c pre-. scr:es in the Scn:tht':rn ~.AE'R.At:K hc:mgc., CuJ.ti·vnt€:r1 D.T'811.i1 fli"O concentrated. in the vnlleye. In nrco.s where no cW.t1vc.t1oi.1 is .r.~~tnnpttJc:1 ai1r1_ 1n crop l.•n,:!_t< thMt h;::;_ve been .[:1.bnnd.r:)ne(;_~ coersc grasses, shrubs ..md -scrub pines prec1cr:.:ino.te. Tree '

!f~~s P~~~, ~~~~: .-_ ;P;~c !~1o~~r~~~-~~n~n~,;;~~ 0N;~e~~;i~~.~1~~~'.t es 1

~--- ,_. ~b). For.as~: Th? f?:e.st. is turgel:i_pine ~-n:1 fir~ 1~~~r~~ ~;nk ~ t~~- ~~j~~ ~-~r~~tp~~~~~~~~~e~~e~r~u~a~~~~ ~; ~~i~X grov:-c.:.1. .t.·or 1;11c arc.:; covcrcc_ u1 -en t:rccs or ccrun gro-.,rt:n, sec enclo s ur.e ( 3), iiVee;otc. tion Overlay11 • ~hi a ov crlD..J c1o os t;ot in(~:icnte snnll out off .o.rcns or areas uhlch 11avc been ci1r:.ngecl due to art1ll er~· fire or bonbine;.

(c) Cultivated Areas: T:,.o ctlitivatccl nreas are restricted to the- n(._~r-rU~J r1v~r vulluJt;; .c:om.1 th~ H..A.I'J> .. N-Hl"'N ol~ 11 PW1ch Bowl 11 • However, very little of the lnncl co..pnble of l;elrq_~ ftnuell. is nou unc1er cu:!.tivation c:ue to tl:e nrec.. -ooing i:-1 tho cor:fbat zon8.

('1:) Surface Hntericls: There is an 2bundancc of ccrt.:1.1n t:rpes of f1olc~ construction ::w.tcrlal avnilablo ln tllis nrm1. Thfl str~an b~dS consist of snnO_ ann .,.n,.,ll' rn•1r! +-.,., ... hil~_n nre. densely "t>r0oneci.-w1t::-l· tinbcr~ The abUDd'"anCC or- -....... naturnl l"oad :J.aterinls ~·mvld be nf grent assist!'li~co in 1J:1 .... proving tl:.e prc~Jc::-lt roncl iiyr,tcL.!. The nc,rrm.mess of tho rond1 in pass nrens !'..nft tho rice pnc1C.ies nlonr~ tho rout in t:-.:.e nnrrou vc,.lle:Y'epresent tho g!-eatost trn.ff!cnbility problens to vchicu.ln.r"::wvocent in thin .s.rcD.. The rug-gcc1.'1cS-G of! -~he terrain ar:.(:_ ·th8 lo~v trnfficnbility of ronc1s -during tho r.?.in~ san.snn thrtmghnPt -thih tJ.'''"-' -;.;-,ulfl. bc. A.. h.snd1cn~-, t,('; nny vchiculo.r r.wv.Jnent.

(5) Culturc.l Fcntures:

(a) Villngcs: The v!llnces in thi.s u..rcn hc.vc bE::C C1.l:.1o st co:1:plet oly c'".os ~royeci..

(lJ) ::-tcado and Tro.ilc: The rcoLo througf'.i.OUt 1;:10

f'-!'~o.- ;.1Y e preBf!!'"i~ ell in_ the ro~!~n:r1!::~. th!cG ~ clQ:SBif~c[~ ~~or~s 1 ~,nncn . .o.rc used 1.n enclosure ~~J, 1

' J:5"tr.:•-'G cglc 'l'crrc-..1n s~.;uc~;;.~ "'"" HAl'.rDAII-IU Area'~ there bo1n(';' no nll wca thor roudz in ::he arcr

Those which ure not ~11-,'feuther, nrc poorly r_lu:!-ntaint::c11 huv~;; a w1Uth uf upprux1.uutelj s1xtcuJJ (16) roet o.nc1 pcr.:11t speeds of !'iftoen (~5) to twenty-five (25) oilos pel' hour.

SECRET 5

DECLASSTFTlW


/

DECLASSlF!JW

Wamn mld o.nrt il:lpassabl e to veh10ula:ro tl'af'f'10, nem1 t sinrda-1An P. v~hiOUlar tmf':t'!c englneering effort.

Foot pn1;hs. Enclosure (2) 11 8trnteg1e Terroit) Map l.t_A..ND.AE~F..! Area", includes the mejor_ fQot }n~~!~G ·;;):'o~t ~ those on ridge lines which were omitted _~>!>cause o'f nn ove .... print in rt.n to cr.rphns!;te t...'i.e locat!vn _of r-idge 11nee,. However, foot paths do exist along nll ridge lines,

(c) Rn1lroads: Thcre-_are no ~tajor l'&U~·oad·s 1n this n.rea; H6W8VB.r·; thez·e ls- U. !100f-t se-ction Of nal"'rQl';.-.ga.ga roil:road betWeen the b1nes nt D!I''l29397 and the open Vnllcy nt D'l' 115395. See enclosure" (2), ;Si;ratcgic Terrain 1·1ap ..... HANDAE-RI Aron. •

(d) Bridges: Bridges and fords arc depicted on unc,losurc (2), '*Btrc.te-gic Tarraln ~ - KAl~ Aren=~ Bridges which he.v e been destroyed or seriously dn!:laged are ~l.ep1ctcCt on o."lcloaure {4), ffQbstucle Overlay~.

{e) Defenses:

See enclosure (5), !!En coy vefanae ..lntrtaJ.laotionsn, for najor encrly clef'enaive areas to our present front, The Strung poin~s contain open eoplnCecente . covere,q. ooplo.ciJccnte, artillery anc1 wortnr_ positions, ,POS!!!Iible · stores, v.. fc~r pro_'be.ble r.tili tar;-,r billet a and b1vouno areas, cntiaricraft machine guns) autonatio weapon's pits nnd nnny ro.x.hol cs.,

The strorig points in the westem part of the Division Sector are priMarily along the two MSP.!!!, a.''ld arc co~ncctod by foxl1olos and nutomat1c weapon• a pits, One of the boat npp:r>tJaohes to the noet southern- -o:r tl"...eae strong points co~tains Din€ fields according to TLO afonts and pt"i.sono:t-6 of ¥m.r. ae indicnteCt on enclosure (5 1 ~

~· J.!ILIT_A:RY ASPECTS OF THE AHEA,

D ... C_ritical T crruin FeE"~ turns:

l'flhn .. ,...4+4 ....... '1 •--"~~ .&- __ .._ ______ . f'n:riior.,.Pr'l nT Tho tt ...... .,..., ..

(Bro1m) ·wn;· t~·th~ ;;;;.;_-;;~t:d'-'·4eL·;,.d- ii;;~-a~e ;;~s~;;t;d"' on cnclosurn (8.); !!St:r.--.utegie Terrairr Map .... MA!ID.A.D-R!' Area'' .. Gri Ucul terrain fenturcs on or near the Bad,ger Line, from c::st to woet. nre as Iollo~rs:

Hil1 r:1 ~vnt!o.n a no U<•J

ll 79~1059-1181.=1243

773---.983

hO·<: vuu

SECRET

Grid Oor-d1nutes

DT 2944

DT 2&:H-DT24-1l-D~ 224i

DT 1533-DT 1333

DT lU3l

- 6-

DECLASSTFTlW

Existing Eneny Detm•••· \tj_co Encloeuro (5 l

Yos

Yes

Yes

Yes


SECO!ET

DECLASSlF!JW

, 2/JPs/cfi> Dcr: Co266{B)-51 1 July 1951

b, Obscrvn tlon end Fields of Fire:

The ::~bsorvntion in tho ¥CStcrn portion of tho urea. {~."est of tho !!Punch Bot:ln Arec:J.) 1s liultcU by r.lMY obs·!a"'t.l.ct-1ng ~m.~rf".in n.['_sscs and dense vogetnt1on. V1sib111t? is :-:'.Uoh ~T;;ntcr> f'row the high ground c.n tho southern Sldo". of· the F£&,:-:1YON. -Tho thickly wooded_ arcus provide ['_ nntnrnl cc.DOllflD.gc ~ ... rhich tl:c enu-;;y 1s very £'.dePt r>.t using. Soc enclonurc (3) 1

11 Vegetation Overlay".

Duo to t!1c 11:~1 ted obscrv~tiol'J ancl the ragr;-c::1!:c-sr; of the terrain, fields of fire nrc narr.w.ll;y 11:::1 ted u1th the !r:'.portnnt exce:,otion of the HAEAN-MIDN ~t~..re~ ~'ll"'+1cl: cc.n be "t;oll co·:ercd with observed !'lre fron the contiguous KansQs .(Brown) Linn~ · -

c. Obstttcl es:

All kn0~..rn obstac-les to the front of tho 'K£1218!..~s (Brotm) Line ns o:::' 1 July 1951 nre shown on on6losllre (.j,) nobstu.cle Overlny 11 ~ They consist of' r.linc fielCLs, :r-rJ-::tC't bloolt.s anc1 crc.tercc"t sections of ronda unc1 b:;;-ic1ges which r.ave been C:.t:.!::Lag-:' oc.1 or destroyQO.,. There ic no rr.:!)Ort of the ener::Jy using burb:r~VTire to elate.

c. Concealmen-t and CovGr:

The natuPc o.f the terra-in in t·h1s arcn affords excellent ·6ancec.lnent ttnG, r.nre-r~ especiall;:t Cturin[; tl:c sunr.ter nontho, except in the narrow val2:oy regions nnd the H.ALA.N-MYON Area~ Sec enolosure (2) tiStrC!tcgic Torl"'C•in Nc.p MANDAS-RI Area 11

:J unc1 enclosure {3) I nvccctati6n Ovcrlc .. y 11 .-

In the western hnl:: ... of the D.rca, the terrain lcacling lnto the Kw1sue-Bac1:;m .... Lin::o cw• Oc cons1Clorult ns t':'TO cc!'.lpartr.wnts, co.c.t contn1ning n north-south ,roc.c"l in the vnlley thGPeof fil1(~ "thich :::::crT:c -tho sncoy ns un :·lSR. The ri(gc lines botw-Gcn these r.lrdn·vo..lleys nrc quito pronounced C'nc1 c.:.·c lccc:.terl c:long the- 08, 1·~ und 20 vertical grid lines. ~n thin .-::hcsc north·-south con.pnrtncnts_. thorc nrc ninor c.roas co::r<::artncnts. It is of uo:r•ticulc.r intcre.;s-:; to note, ns · · 111Uatrutcc1 in enclosure""' (5) 1 "Enooy Dcfenso Instnllo.tlona'', tho.t ti:c- ene::~y b..:cs pl"ii:w.rilzr- develoPed ctef'ensive insto.llu ... tions v::.ich overlook D.nci. control thes~ north-south ro2ds in cl.ep~l: froD cor1 tiguous, b.iz,h gro LU1cL.

. In the easter~! bnlr of tho'nrec., the prec1.on1nent to1•ro.in feature is HAZJU.!.-l·1YON A:re£'..i n circular C .. cpressio!""'. su..:•_counc1cC~ n.lr::ost ':)nt.1rcly by n periphery of .f.1Qc11v.r.1 to very high ::1aunta.1ns. nncl therefore freQuently cnllc1 the 11Punch Boulll. At preSent, fr1Emdly· elc.'Jents control the sou~h M(1. southeast nerinhnY'v .. ' '!bile tho enc::.1y controlr. t1-.c -.:Cst rL'1C. north peril;hCX.Y~ -- Ti:.0rorore, the en tiro 11 botrl n nrea, in eff'ect~ is An[J'i(..!"'t: t:o o1:-aervcd fire b·r fricnCLlv cecncl.. ont:!'.ljt oiononts. Ai~~;- du~ to tl-:.e co~:1parnt1Ve steep ground t!"'.o..t encloses the 11 bov-1lll, :t-: c1oes not lend !tsnlf' in noE;t po:-r_,~-<:t:: of t~1e periphery to- dc·slrcable routes of r.yprouch.

SECRET - 7-

DECLASSTFTlW


DECLASSlF!JW

~/JPS/ofb Sor: OC2Rfi(B)-S1 4 July 1951

l~njor cno=.::y routes of .1":·:)r.)P.C~~ into the Kn.nsns-3:::-::·.[_·cr Lines cm~siSt of t:'lc t.b.Tee nor'.:h-south ro,.,::!.s 1:-, t:te 7i:::lr:lty o~"' tLo 11, 16, .:.-:nd 30 verticnl gric1 lines.. L:port~ ~--~J.';; t.:..:.=tical cntro.nts into tho K.2nsns (Bro•tm) Line consist e:f' ti~-...:: vo.ll~y coopc.rtuc::-1ts leo.c1inc; thereto bet"t'fcen tho 08 c.,lC 15 vcr'tical e;rid li:IGS: tl:c GD .. CLHt:: lacc .. tcC!. c.t D':: 2132 e.n..:1 D':' 2133 o.ncl. the v :\11 ey e::t ending bct,:J"e Cn DT 16;).::, c~1tl DT 123?.~ ·Ther;r; ,J.rr:; (!.p,~,lctnJ ,_,,, F:Y'i.Closuro (6). 11 l-~rt'tor :Cn·~~-·; ?..Jutes ~f .APpro;_cl:ll: -- - · · ~ ~ -··v

<:::., ~'AC~IC,:J... EFFSCT OF ':'HE AFI:A.

'-·• Effect en Encny Cttuo.bilitics:

Tho hcnvy r:-.infi'll unll rcducccl. roD.c1 nnC. grounl. ti"'2f-1"1cnbil1tJ' rcnC:.ers r:, coupo.""'r'.::ttivc ndvnnto.gc -r:o t.:c cncr Yt fer his syste:.J cf sup-ply dO'venCI.o far lens on hco..vy ootor oovou-::;n-:::s. Also, the l"'CC:v.c-:.fOn of vist~bil1t~· will fl.llo\..; hi:-J !:c c~ce-:-:cr sc-::mrit~r in the conduct of nny grounC:_ ac.tivit:;:r by ' s::.,:r.·.ioLLBl:.r lu 1;J"u:r.-·lrq; uc..tr· <::c-oil:tty to use obaor-r.:,tiCJ:1 c:cil~cro.ft,

c.l:."' stril;:cs £'.i1L~ obsorvcc:. ur-tillory fire.

The nn.turo r.ncT hoi[:¢1t of tl-.c terrs.in in tho r..nnds of CJ.1C::1~-- :.o t~l.c north of -,chc Knnoas (Bro1m) Line nllo,.rs a slig:::t n.-::1vo.nto.gc over our forces.

'::'hl"'OO l':'.(l_in corridors in t~-;J vicini-::;~~" of the ll~ 1~, ['_j~(l 30 vertical grid lines do ra:vor the eneoy l.rit:"~ rc~.::-n., tr_~ ~1t:~_,r!nnnt into thn ":::lnttlc nrno.~ Hm.revcr. it shoulc1 ho notoi i"llQi-t11C~Y.oD.~i-uloD.g--thc il-verticnl [;1~1c~ llnG c.ht.nc;cB· t-:1 u.' southNGst c!.ircction u-oon ontorinn:: t~J.c BaC..2:er Lj_nc. c.nC: .• ".;;lms, avoids the Division Sector_, but ""'acts c.s fooC.or rOQ.Ct · :o the r.w.ny southcnst e..TJ.tro.nts into tho south f'lP.nh· o:f' the :;.-L,;~L-Slon Sector o~: tho Konso..s (BrOrm) Line. :aetwec1 ~he ce C'-~1ll tr~e l5 vcrticnl gric1 linos, tho!"8 ~re oisht tr.ctic~.l cntrc:uts of tbis nnturc; o.c dcr91cted L-;. cr.clo~urc (G) 1

u~ic~jor Lnc:;:/ Hout co of ..-'..p_prJ.nchn. Bet1:-.r8Crl tl;_c ror}.:'.s j_::i. tho vicinity of the 16 o.nc1 3C verticnl s-ri d. lines, tLcrc o:;_"'c ~;·,Jc, t;_:.._-:tic:·l cntrnnta into the Xc:.ncas (Bronn) Li!"l.c: cnc ·ucin;:; ·~:1c rudrllc in the vicinity of DT 2132 E'.nC:. :8T 2133 c:J1("2. the (:thsr beinc; 8. valley ext en fling bnt-:;.~erm DT l534 ~na. D':' 1932, both of' which are pl"esented in t::1e above encl6sure. ':'~:o :t-L.::.:S).l!-HYG:--: Areu, 2. natu:r·a.l rt·bot<.rl!! Rre:~~ .. tet,_ .. reen -:-::Le ric-:.c::c l1no along the 2C vcrticnl [:;rid. line aw:', the road i:1 ti:c ·7icinity of tho 3C vcrtico.l g;dQ litH~, :s net cc~J.C.id.cPc.:J. o. ~-;oocl approach into -~l"~c :friendly lines bec£1_uoe of the Gtocp sloucs e.nC~ the b.i;;;_"l grounc1 in the vicinity of the lL'Xt::o'-·~-s (3r~1m) Line, fran \rhicl-~ accurate nnd ho2.vy obccrvc6. fire could ·::.e plc,ccd on B.ttacklng cncc:y forccc. ·::hcrcforo, ::.s c" t;cnc:rr.l Sw:lD.:::.ry, tho enony is f.:::.vorGd. ~ri t!:J. 0.9yroc.:,0l--_,_ l""D~rto:; to -'cl-:b Kansa.s-Baclger Lines on Dotn siCLcs Oi' the B;,._::Ar--aYGl' Area, but t:11 s ad VMta.ge is con:::iC:..crr.bly n cutroJ.1 zocl by -tl:o li:,c~ ~h1:ct Lc uuot tLei1. ~~ttu.ck tho KD.i'is.s:.G {Broan) L.i:-,n, -: . .rhict c.:J.n bo considered as a cross co::ri6.or e:;~cept for "l:::--~c ·Fr_llo:."r: :t."ollo1J"CC by the roaO.s in tllc: vie1nit~" o:f tho lG .~~nc1 30 ve:;:tlco.l r~rid lines.

E:~.eo_'f usc of v.ruor in an c:.t.tnck on the Ko.ns.;:,s (Drmm; .!..~no, ujoul:f-c-robo.bly be rostrictcG. ton ur:c of the norLilGo·_·_th ronde ln thE: vicinity of the 16 nnd 30 vcrtico..l r;rid linos. i:~oithcr of thcGc ro.:1.ds 1iJ"ould lond"thcosc1vcs tor:. use of urr..or e::cept in n ool1J.!Yln fm-nn.tioil; espccinlly clurin[ periods of ~oo r t rafflcub111 ~ y. Howcvort one c enc..rny nrno r

8.

DECLASSTFTlW


SZCRET

DECLASSlF!JW

2/JPS/efb -Sor: 00206(3)~51 4 July 19Sl

pcnctrnte::a tho K~lnsas (Broun) Line in t:1o vicinity o::~ ~T 1C::7f"\ ~+- ·--·1;:! --~-"' ~~-~----~, .£"---~-- ~~ .f.j,.- ~---1-·-~-~~J· _l_VLJ~/; .l..U ;<\J . .LLL I::II.JI_J~,J .JIIIll"~'c.'.hC_<IC ll"J-"-"-'l_llt J.ll ..Luh t·;:_tl-I.J.ll~''--11;,!"~

·.;.-!LC -~JC~<".-~.;.uer, incluc~~!!F .!.-.!;) c1rer..:t OH tn' . .l..LJ.•.:-t:_-_,ility~ ~ur~n:; the r:10nths of Jul;Jr rnd Aut,1.wt, offers o.:::.ny Uis.::-.cl'/['_nll''-008 ·.::o nilitar~' operatior.s ~nd. certo.inly :·!ill .b'""''1l1[1icp.p our forces T,Jith their dependence on ootor trnnsport nnd r'.lrF .... "'"'""• Heavy prcci~Jit.s.tion .::::..nd the· rcsL:lte.nt flooCtin;:; of l01ilL'.-ncls will restrict use of .:trr.10r1 ir.1pe<.1o supply o.nc1'troo9 novc::::1en:;s &'1cl scriousl:: reduce, f'or indefinite pcricds 1 close n.i( support, observation (fro:J OPs, AOPs nncl t.:'.c?-1-<?n .. l rtircraft), tiJ.l;:L-"g of .:lel-·io.l pl1otogrrc .. ·JJ1s anc.L observe(! [',j""'.:;il.

lcr~· fires. Main roucls in ~;encrC'l lilill be trnfficr.lblc, hot·.rOVC'l', BL:C:JnC .. c~;;:-·y Y·uaC..o ;,;D.y i;w I'enc1cPc.·•.:lc 1r.ipussabl(:· by fJ ~csh floods, Glicl_cs anr1 ;,.,.rnsb...onts~ Sudden river pml stre~.r.1 :i.'"'iscs f.iL~:.' llaua[:;o present bridg-1.::1{-;, n['ke exlSlj~nu; forc1s urm~c.~uJ..e .::.nc1 incre..;..sc the difficulty of briO.gin;::: opernticns.

Tl" .. c terro.in D.r.d veE'.ther in ~cner£~J. '·rill affect o· ... tr ni sRion to organl ze nnd. r'l .. ef'cnd t~1.e K.:ms~.s (Brmm) :..inc in tl:c follmjine:; rcRpccts:

(l) Hu.cc;ed torro.in ~1!th difficult: rout0n (lf' ~.nnroor.h. cs~Jcclnll:/ in inclenont ,;-.rcntl:el", Hill r.1nkc tl1e su,P:f,;ly of"' fr-on·~ line units incrcnsin"O-:/ cliffic.L~l t.

( 2) !ncrcusir .. r:- ar.:.,:·nts of ruinfal2. r.:.::t~,r serio\.:.sl;r ~.ffcct nc~~=~.:...l rlovcr:Hmt sChedules of trucks nne""~ su~oplios clue to v_". do'tcrior;.".::ioi.-: of ro.:.'.ds_, pna,.,i8ilit:r of 1ms~::.ocl out bric.'.t;cs_!o tu1uso.blc for<1s and lo,,v tr<:'.fficabilit~r of groLmcl o:-.rccs L.lBed, otl-ccr 7.>:.:-·n 1 "":l~:JT'OV C•~ T'O['~(l5.,

· (3} B_[:.J.ucc<J. vis1bil1t~' r~r··HJ. cov•.:..:t"?'l6"'' c,f 8n•~ .. .1y El"LC.s h~~ O:Ps, A:)Ps, tactical nircrnft:, a1l1 aerial pl· .. otogrc.phy, "~horc-1::·.':' .~.lso roLll.lcin~ obscrvcrl ..':'~rtilJ .. o:-y fires.

V::O) Hccluccd uoc of .air stril'::cc .•

~·~:.c terrain and uc2,thcr in ::;oncn.i.l 11Till .rcf'f"~ot our nioc.:._cn to conduct active patrolling fort-rnr~l of ti:o I~1.nsc.s (BJ.~ow-n) Line 1n the follo\·7L1g roGpcCtG!

(l) Ir.i.clcnont N"outl-~or unc1 1 ts r.ffoct on terrain \·.r.i l.l prob.:-~bl:r reduce: the :-:1ovcncnt end incrcc.se tho no1T' .. tti' t;i:-Jc L.c.tur· L: tLe plur~nins fo:..~ v.nl1 c:onlluot o:f' patrols.

( 2) Eovenent of t2nks. ['_ncl. ve!liclcs over roacl .. s, lJI'J.LlO';j'·' c.nc:l fa rC'.s r.w.y vary fror.: incrensinc..:;ly d1ff1cul "';; to i6po s sl bl c

( 3) Air obaGrvntion or cover for pntrols \'dll bf rcc14CC>l

(<:b) lZipln?mch~ cr orntro.lled nrtiilci-:r t'111'b' c n btn:or<H< enc:-,y .o~ctivity by FO' c; ncco::1po.n~rinc patrols ,;..rill be reduce·

SECP.ET

DECLASSTFTlW


,~,. ---

E::1c-:!..osuros:

?S~~~Ol!. ~ElW ~'->.l.AJ.i >::j· .,_..._;:-_;

DI GT?.IBUTION:

ADC '' I"' v;_u G-1

Div ETO Asct DiTr Engr o FSC:J Hi st section lc·~ I~t'.r

bt.i1 H<lr 7th Hnr ll th llnr l st KI-I-~ Roh't lst :.:n;::;r Bn ls':; H:' Bn l.st i·TT .B(l 7tl: HT Bn 1"~ "' SP Bn Lst 01'\'J ~-J::;!!

1st Serv Bn " -• R1 ,,- Bn L ;_, L•

TJ~u 1st Bn

~X _CoPpS ~~ :..:o ~.P s S-2, X Corps Arty ?.nO. Inf' Div

DECLASSlF!JW

2/JFo/of"o ser: D0266(Bl-51

, 4 :-:Jul~r 1951.

BY 00Bl-1AND OF !1AJOR GENER<-~ THm-~--=~s:

V. H. KRULAK Colonel. U.SHC Chief of st~f:r

Zun ru1c1 IJ!::on Data for July Strc. tcgic Terrain H . ..,p - HANDAT::-RI Vegetation Ov-erlay O"bstnclr. CvArla~r Enc!'.'ly Defense J;nsto.llations r.::HjO<' :":::nc·i-!Y Rou.tea of .Appronch

{l) (1 ~ ( l) (l) (1) (l) (li (l) (l j (l) ( 5) ( 4) ( ~) (1) (6) (l) (l) (1) ( l) (l) (l) (1) (l) {l j (1) {l) (l) (l) (l)

KIL\G~ 5th ROK Div IGU.\.G, ?th ROK D1v lG 7th Airborne Regt lst g),~'{

;, !".' \-l..V1

(1) (1) (1)

m ?I:~:F LAli-T 2nd Hnr Div 2nd MAH HCS T'l'll ?~~C TTU :.:..NT

(l) (l) (1) (J.l (l)

iii CC~-:~~ :-.:VF~ (1)

SEG:rtr:T - 10 -

DECLASSTFTlW


DECLASSlF!JW

,,,...., ...... TiCA~ S -;

..... , ...... ,f'-,1 Of MA: J,

T£.G1C TERR~~~~~~ ;VJ./\P-MA~t\JDAEJ.Rt EA-.• -- .. - - - ·I;

'-"""-TAT\Of\..j OVE.RLA.. Y. f t TACLL OVE:.RLI-"- r~ !-

·~ Y OEF'ENSE. -!NSTAlLA ll Of'.J~·

' . ~ . -

t:.NE.MY ROi) rU~ 0 F" 1\PPRp/\C!-i. ~ ~

Tl/~L~

DECLASSTFTlW


DECLASSIFIED

:RESTRICTED

:WCI.OSURE (1) !1'0 !l'ACTI CAL STUDY OF MAND.AE-RI AREA

SUN Al'D MOON DATA FCR JULY

D~ Sun RiSe Sun Set Moon Rise Moon Set

1 0516 1958 0321 2 0516 1958 o4co

~ 0517 1957 o446 0517 1957 0539

~ 0518 1957 o637 0518 1957 0738

7 0519 195l osa9 8 0519 195 09 1 9 0520 1956 1042

10 0520 1956 11~ 11 0521 1955 12 12 0521 1955 1352

ia 0522 1954 1502 0522 195 1613

15 0523 1954 17ag 16 052a 1954 18 17 052 1953 1953 18 0524 1953 2050 19 0525 1952 2136 20 0526 1952 2213 21 0527 1951 2243 22 0528 1951 2"'108

~a 0529 1949 2333 0531 1949 2357

25 0531 1948 26 0532 1948 0023 27 053a 1947 0049 28 053 1946 0121 29 0535 19~ o1as 30 0536 19. 02 2 31 0536 1943 0333

llOTE: All times are ffKw time.

ENCLOSURE (1) ro TACTICAL S'ro!JY OF MBlD.AE-RI AREA

RESTRIC~

DECLASSIFIED

1641 1938 2031 2116 2156 2229 2258 2323 2347

0010 0032 0059 OJ2S 0204 0250 0)50 0500 0619 0738 0856 1006 1117 1221 1a2r 1 29 1533 1633 1"132 1827 1914

Noon Phase

New Moon

1st Q,uaxter

Full Moon

Last ~=ter


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