What happened March 1975AD in Vietnam

On 10 March 1975, General Dung launched Campaign 275, a limited offensive into the Central Highlands, supported by tanks and heavy artillery. The target was Buôn Ma Thuột, in Đắk Lắk Province.

The ARVN proved incapable of resisting the onslaught, and its forces collapsed on 11 March.

On 20 March, Thieu reversed himself and ordered Huế, Vietnam's third-largest city, be held at all costs, and then changed his policy several times. As the North Vietnamese launched their attack, panic set in, and ARVN resistance withered.

On 22 March, the NVA opened the siege of Huế. Civilians flooded the airport and the docks hoping for any mode of escape.

By 28 March, 35,000 NVA troops were poised to attack the suburbs.

By 30 March 100,000 leaderless ARVN troops surrendered as the NVA marched victoriously through Da Nang. With the fall of the city, the defense of the Central Highlands and Northern provinces came to an end.