William Camper refused to go through with the surrender, so he decided to leave Camp Carroll along with three officers and they were rescued by a US Army CH-47. Six 175mm M107 guns were captured by PAVN. On 2 April 1972, Camp Carroll was officially surrendered to the PAVN, with a white flag raised over the main gate of the camp. Following the surrender, a B-52 strike was ordered against Camp Carroll. However, it was too late as the PAVN had already moved the M107 guns out of the camp. Dong Ha On 30 March 1972 the 258th Marine Brigade was deployed to Đông Hà to support the 3rd Division. Early on the morning of 1 April the 4th Vietnamese Marine Corps Battalion abandoned Firebase Sarge and retreated to Mai Loc Camp. By 1 April the PAVN had broken through the ARVN defensive positions along the DMZ and north of the Cam Lo River and fragmented ARVN units and terrified civilians began withdrawing to Đông Hà. General Giai, ordered a withdrawal of the 3rd Division south of the Cửa Việt River in order for his troops to reorganize a new defensive line: Regional and Popular Forces would secure the area from the coast to 5km inland; the 57th Regiment would hold the area from there to Đông Hà ; the 1st Armored Brigade including the 20th Tank Regiment would hold Đông Hà; the 2nd Regiment reinforced by an armored cavalry squadron would hold Cam Lộ, while the 56th Regiment supported by the 11th Armored Cavalry Squadron would hold Camp Carroll. Extending the line south the 147th Marine Brigade would hold Mai Loc and secure the high ground along Route 9 between Cam Lộ and Mai Loc. By 11:00 on 2 April the ARVN 20th Tank Regiment moved forward to Đông Hà to support the 3rd Marine Battalion and 25th Marine Brigade in and around the town and defend the crucial road and rail bridges across the Cua Viet River. Marine ANGLICO units called in naval gunfire to hit PAVN forces near the bridges on the north bank of the river and destroyed 4 PT-76 amphibious tanks east of Đông Hà. More tanks were hit by a Republic of Vietnam Air Force (RVNAF) A-1 Skyraider before it was shot down. At midday PAVN tanks attempted to force the road bridge, but 6 tanks were destroyed by fire from the ARVN 20th Tank's M48s. At approximately 13:00 Captain John Ripley an adviser to the Vietnamese Marines swung under the road bridge and spent 3 hours installing demolition charges to destroy the bridge. The bridge was blown up at 16:30 and the damaged railway bridge was destroyed around the same time temporarily halting the PAVN advance. Naval gunfire and a B-52 strike were soon directed at PAVN forces gathered on the northern bank. At 18:00 a USAF EB-66 was shot down west of Đông Hà and a no-fire zone was imposed around the area allowing the PAVN to capture the Cam Lo Bridge intact. Over the next two weeks PAVN forces kept up a barrage of artillery, mortar and small arms fire on the ARVN positions and infiltrated small units across the river in boats. On 7 April the Marines withdrew from Đông Hà leaving the defense to the 1st ARVN Armored Brigade, 20th Tank Regiment, the 4th and 5th Ranger Groups and the 57th Regiment. At dawn on 9 April the PAVN launched an attack, led by tanks, against Firebase Pedro southwest of Quảng Trị. The PAVN tanks had outrun their infantry support and 9 tanks were lost in a minefield around