Command then devolved upon PAVN Major General Hoàng Thế Thiện. In December 1974 the first phase of a limited PAVN offensive in South Vietnam began. Its success inspired Hanoi to try for an expanded but still limited, offensive to improve its bargaining position with Saigon. In March, General Văn Tiến Dũng launched "Campaign 275", the success of which prompted the general to push Hanoi for a final all-out offensive to take all of South Vietnam. After an ineffective attempt to halt the offensive, Saigon fell to North Vietnamese forces on 30 April 1975.