sentences:  The capture of Camp Carroll and Mai Loc allowed PAVN forces to cross the Cam Lộ bridge, 11 kms to the west of Đông Hà.The PAVN then had almost unrestricted access to western Quảng Trị Province north of the Thạch Hãn River.On 7 April the Marines withdrew from Đông Hà leaving the defense to the 57th Regiment, the 1st ARVN Armored Brigade, 20th Tank Battalion and the 4th and 5th Ranger Groups.