▁placed ▁under ▁the ▁control ▁of ▁the ▁ 2 d ▁Brigade ▁and ▁land ed ▁by ▁hel ic opter ▁south ▁of ▁the ▁ 5 / 6 0 th ▁Infantry . ▁By ▁night fall ▁the ▁ 3 / 6 0 th ▁Infantry , ▁unable ▁to ▁overcome ▁the ▁V C , ▁was ▁ordered ▁back ▁to ▁improve ▁its ▁def ensive ▁position . ▁One ▁AR V N ▁batt alion ▁was ▁land ed ▁by ▁hel ic opter ▁at ▁approximately ▁ 1 6 : 0 0 , ▁north west ▁of ▁the ▁ 3 / 6 0 th ▁Infantry , ▁and ▁prepared ▁to ▁set ▁up ▁a ▁position ▁along ▁the ▁west ▁bank ▁of ▁the ▁Rach ▁Ba ▁R ai . ▁The ▁four ▁American ▁batt al ions ▁were ▁in ▁an ▁arc ▁on ▁the ▁east ▁side ▁of ▁the ▁Rach ▁Ba ▁R ai . ▁The ▁stream ▁was ▁de emed ▁a ▁possible ▁V C ▁escape ▁route ▁to ▁the ▁west , ▁although ▁the ▁ 3 / 4 7 th ▁Infantry ▁had ▁seized ▁a ▁number ▁of ▁civil ian ▁boats ▁just ▁north ▁of ▁Route ▁ 2 1 2 ▁during ▁the ▁late ▁afternoon . ▁Ass ault ▁craft ▁supporting ▁the ▁ 3 / 4 7 th ▁Infantry , ▁and ▁ 3 / 6 0 th ▁Infantry , ▁were ▁position ed ▁to ▁watch ▁for ▁V C ▁and ▁place ▁fire ▁along ▁the ▁stream ; ▁however , ▁no ▁U . S . ▁boats ▁were ▁deployed ▁into ▁the ▁stream ▁unless ▁U . S . ▁were ▁ash ore . ▁ ▁During ▁darkness , ▁air ▁and ▁art illery ▁ill um ination ▁was ▁maintained ▁over ▁the ▁area ▁and ▁art illery