 On the evening of 7 April elements of the People's Army of Vietnam (PAVN) 9th Division overran Quần Lợi, the 7th Regiment was ordered to destroy their heavy equipment and fall back to An Lộc.Once captured the PAVN used Quần Lợi as a staging base for units coming in from Cambodia to join the siege of An Lộc and key members of COSVN were based there to oversee the battle.On 8 August the ARVN 18th Division launched an assault to retake Quần Lợi but were stopped by the PAVN in the base's reinforced concrete bunkers.