 In July 1964 , the 271st and 272nd Regiments of the People 's Liberation Armed Forces ( PLAF ) , began moving into the provinces of Bình Dương , Bình Long and Phước Long to carry out their mission . During the first phase of their campaign , the Viet Cong regiments overran several strategic hamlets at <unk> Sang , Cam Xe , <unk> <unk> , and Thai <unk> . Between August and September 1964 , Viet Cong regiments executed deep <unk> into Bình Dương and <unk> <unk> to apply additional pressure on South Vietnamese outposts situated on Route 14 . During the second phase of their campaign , the Viet Cong ambushed two South Vietnamese infantry companies and destroyed five armoured vehicles , which consisted of <unk> <unk> light tanks and M @-@ 113 <unk> . The PLAF defeated regular South Vietnamese units at the strategic hamlets of Bình <unk> and Bình Co . 
