 By the evening of 27 March all evacuation flights out of the base were stopped, but propeller aircraft continued to evacuate refugees from Marble Mountain Air Facility.That night General Lanh, Deputy Commander of the RVNAF flew into the base and instructed General Khanh the RVNAF 1st Air Division commander to evacuate all flyable aircraft, 130 aircraft would be evacuated while some 180, including 33 A-37s, were abandoned.The PAVN attack began on the morning of 28 March with an artillery barrage on the city, probing attacks quickly penetrated the ARVN defenses, and the fragile ARVN discipline collapsed and soldiers began to desert their positions and seek refuge for themselves and their families.