▁arrived ▁at ▁Y ok oh ama , ▁Japan , ▁on ▁ 2 4 ▁December , ▁and ▁was ▁flow n ▁from ▁T ach ik awa ▁Air ▁Base ▁to ▁Ta egu ▁five ▁days ▁later . ▁ ▁Korea ▁ ▁Ar riv ing ▁in ▁Korea ▁at ▁ 1 1 : 1 5 ▁on ▁ 3 0 ▁December , ▁the ▁ 2 nd ▁R anger ▁Company ▁was ▁attached ▁to ▁the ▁ 3 2 nd ▁Regiment al ▁Com bat ▁Team , ▁ 7 th ▁Infantry ▁Division , ▁X ▁Corps ▁which ▁was ▁re group ing ▁in ▁Y on ch on ▁having ▁been ▁badly ▁m au led ▁in ▁the ▁Battle ▁of ▁Ch os in ▁Res er voir , ▁a ▁battle ▁which ▁sign aled ▁the ▁unexpected ▁entry ▁of ▁Chinese ▁troops ▁into ▁the ▁war . ▁The ▁next ▁day , ▁the ▁division ▁was ▁ordered ▁to ▁T any ang ▁and ▁W on ju ▁to ▁block ▁Chinese ▁south ward ▁advance ▁along ▁main ▁roads ▁and ▁rail ro ads ▁in ▁the ▁area . ▁On ▁ 6 ▁January ▁the ▁R angers ▁arrived ▁at ▁Ch ang nim - ni ▁with ▁the ▁regiment al ▁headquarters , ▁where ▁they ▁were ▁used ▁as ▁a ▁security ▁element ▁for ▁its ▁medical ▁units ▁to ▁protect ▁them ▁from ▁in fil tr ation . ▁The ▁R angers ▁established ▁counter - gu err illa ▁pat rol s ▁around ▁the ▁regiment ' s ▁main ▁aid ▁station ▁and ▁headquarters . ▁They ▁first ▁saw ▁combat ▁at ▁ 0 2 : 0 0 ▁on ▁ 7 ▁January , ▁driving ▁off ▁ 2 0 ▁North ▁Korean ▁gu err illas ▁who ▁had ▁in ad vert