▁rem ed ied ▁or , ▁at ▁least ▁for ▁the ▁time ▁being , ▁bal anced ▁by ▁the ▁increasing ▁mob ility ▁of ▁the ▁neighbor ing ▁ 9 th ▁Division , ▁which ▁General ▁Th anh ▁had ▁with dra wn ▁from ▁its ▁area ▁security ▁miss ions ▁and ▁began ▁using ▁it ▁as ▁the ▁Corps ' ▁reaction ▁force . ▁ ▁During ▁ 1 9 7 1 ▁the ▁Division ▁and ▁territorial ▁forces ▁focused ▁on ▁destruction ▁of ▁P AV N ▁and ▁V C ▁Base ▁Base ▁Area ▁ 4 7 0 ▁on ▁the ▁boundary ▁of ▁ Đ ị n h ▁T ư ờ ng ▁and ▁K ien ▁Ph ong ▁Provin ces . ▁ ▁By ▁the ▁end ▁of ▁ 1 9 7 2 , ▁the ▁Division , ▁with ▁headquarters ▁at ▁ Đ ồ ng ▁T â m ▁near ▁My ▁Th o , ▁was ▁responsible ▁for ▁K ien ▁Ph ong , ▁K ien ▁Tu ong , ▁ Đ ị n h ▁T ư ờ ng ▁and ▁Go ▁Cong ▁Provin ces . ▁A ▁major ▁problem ▁facing ▁the ▁Division ▁was ▁security ▁in ▁dens ely ▁populated ▁ Đ ị n h ▁T ư ờ ng ▁Province ▁which ▁was ▁the ▁key ▁to ▁control ▁of ▁Highway ▁ 4 , ▁the ▁important ▁line ▁of ▁communication ▁leading ▁to ▁Sa ig on ▁and ▁it ▁contained ▁the ▁major ▁city ▁of ▁My ▁Th o . ▁It ▁was ▁also ▁the ▁focus ▁of ▁two ▁major ▁enemy ▁in fil tr ation ▁cor rid ors ▁from ▁Camb odia . ▁One , ▁Cor rid or ▁ 1 A ▁generally ▁par alle led ▁the ▁boundary ▁between ▁K ien ▁Ph ong