On 24 March two regiments from the PAVN 9th Infantry Division, in coordination with two provincial infantry battalions from Bình Phước, attacked Chơn Thành with full force but were repeatedly driven back from the ARVN defensive lines. On 31 March the PAVN 4th Army Corps sent the 273rd Regiment and one artillery battalion equipped with 15 artillery guns to bolster the 9th Infantry Division. Following the arrival of these reinforcements, the PAVN continued their assault on the military zone of Chơn Thành. South Vietnam responded by deploying the 3rd Armored Brigade to relieve Chơn Thành, but they were stopped by elements of the 9th Infantry Division along Route 13. To avoid destruction, all surviving members from the ARVN 31st Ranger Battalion retreated to Bau Don in the east. On 2 April the PAVN captured Chơn Thành; they claimed to have killed 2,134 ARVN soldiers, as well as capturing 472, and to have shot down 16 aircraft. In addition, North Vietnam captured 30 military vehicles (including eight tanks) and about 1,000 guns (including five artillery pieces) of various kinds. With the province of Binh Long firmly in their hands, the PAVN then set their sights on Xuân Lộc.