Also on 17 March, the 3rd Battalion, 43rd Regiment killed 10 PAVN in heavy fighting northwest of Hoai Duc. At the same time another outpost of Xuân Lộc District, Ong Don, defended by an RF company and an artillery platoon, came under artillery and infantry attack. The PAVN assault was repulsed with heavy losses on both sides, and another RF company, sent to reinforce, ran into strong resistance on Highway 1 west of Ong Don. North of Ong Don, Gia Ray on Route 333 was under attack by the PAVN 274th Infantry Regiment, 6th Division. The 18th Division headquarters therefore realized that two PAVN divisions, the 6th and the 7th, were committed in Long Khánh. While the battle raged at Gia Ray, another post on Highway 1 west of Ong Don came under attack. Meanwhile, a bridge and a culvert on Highway 1 on each side of the Route 332 junction were blown up by PAVN sappers. Thus, all ARVN forces east of Route 332 were isolated from Xuân Lộc by formidable obstacles and PAVN roadblocks. North from Xuân Lộc, on Route 20, hamlets along the road were occupied to varying degrees by PAVN soldiers, and the RF outpost far to the northeast near the Lam Dong boundary was overrun. Đảo decided to counterattack up Route 20 with his 52nd Regiment, minus one battalion but reinforced with the 5th Armored Cavalry Squadron from Tây Ninh Province. The regiment was ordered to clear the road as far as Định Quán, but the attack quickly stalled as it met heavy resistance well short of its objective.