, ▁ 1 8 5 ▁structures , ▁ 1 7 ▁tons ▁of ▁food ▁and ▁ ▁of ▁cro ps ▁were ▁destroyed . ▁ ▁Th ầ n ▁Ph ong ▁II ▁In ▁ 1 9 6 5 , ▁the ▁V C ▁attacked ▁all ▁over ▁the ▁Central ▁High lands ▁in ▁the ▁II ▁Military ▁Region . ▁In ▁early ▁July ▁ 1 9 6 5 , ▁three ▁People ' s ▁Army ▁of ▁Vietnam ▁( PA V N ) ▁reg iments ▁( including ▁ 3 2 nd ▁and ▁possibly ▁the ▁ 3 3 rd ) ▁completely ▁isolated ▁the ▁Central ▁High lands . ▁AR V N ▁units ▁could ▁not ▁use ▁National ▁Rout es ▁ 1 , ▁ 1 1 , ▁ 1 4 , ▁ 1 9 ▁and ▁ 2 1 , ▁and ▁all ▁res upp lies ▁to ▁the ▁High lands ▁had ▁to ▁be ▁performed ▁by ▁air . ▁On ▁ 8 ▁July ▁ 1 9 6 5 ▁Hi ế u , ▁II ▁Corps ▁Chief ▁of ▁Staff , ▁was ▁entr usted ▁with ▁the ▁design ▁and ▁execution ▁of ▁a ▁plan ▁to ▁re open ▁National ▁Route ▁ 1 9 . ▁ ▁Con tr ary ▁to ▁the ▁general ▁practice ▁of ▁a ▁road - clear ing ▁operation ▁by ▁concentr ating ▁troops ▁to ▁progress ively ▁destroy ▁the ▁amb ush es ▁set ▁up ▁by ▁the ▁enemy ▁along ▁the ▁highway , ▁from ▁D - 6 ▁to ▁D + 2 , ▁Hi ế u ▁ordered ▁the ▁ 2 2 nd ▁Division ▁and ▁the ▁ 3 rd ▁Arm ored ▁Squadron ▁to ▁attack ▁from ▁Qu i ▁N h ơ n ▁to ▁T