On the evening of April 7, elements of the PAVN 9th Division overran Quần Lợi Base Camp. Its defenders, the 7th Regiment of the 5th Division, were ordered to destroy their heavy equipment (including a combined 105mm and 155mm artillery battery) 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. Key members of COSVN were based there to oversee the battle.