 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 Xan Sang , Cam Xe , Dong Xa , and Thai Khai . Between August and September 1964 , Viet Cong regiments executed deep thrusts into Bình Dương and Châu Thành 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 M24 Chaffee light tanks and M @-@ 113 APCs . The PLAF defeated regular South Vietnamese units at the strategic hamlets of Bình Mỹ and Bình Co . 
