The invasion was launched from Cambodian Base Area 708 by the B-2 Front's 5th PAVN/VC Division and 203rd Armoured Regiment, which advanced down Highway 9 toward the border outpost of Loc Ninh. There, the 2,000 men of the ARVN 9th Regiment and a battalion of Rangers beat back five separate infantry/armor assaults before collapsing under the attack on 7 April. The North Vietnamese then isolated the 25th Division in neighboring Tây Ninh Province by sending two regiments to attack its forward outposts.