In March 1975, just before the end of the Vietnam War, the body of a young Vietcong guerrilla was found face up on National Route 1, which was an important lifeline for the north-south logistics of Vietnam.

　 In March 1975, just before the end of the Vietnam War, the body of a young Vietcong guerrilla was found face up on National Route 1, which is an important north-south logistics lifeline in Vietnam. National Highway 1, officially known as National Highway 1A, runs from the Phu Quy Quan border gate near the China-Vietnam border through the major cities of Vietnam. This highway was built by French colonists in the early 20th century. With the blockade of National Route 1, the People's Army of North Vietnam (PAVN) killed approximately 2,000 South Vietnamese soldiers and civilians on National Route 1 between Quang Tri and Hue in South Vietnam from April 29 to May 2, 1972, during the Easter Offensive.

　On January 6th 1975, the South Vietnamese army suffered a devastating defeat, and the North Vietnamese army occupied Phuoc Long City and the surrounding provinces. This attack was a clear violation of the Paris Peace Accords, but there was no retaliation from the American military.

　　On March 1st 1975, a powerful offensive by the North Vietnamese army begins in the central highlands of South Vietnam. The South Vietnamese army was thrown into chaos and forced to retreat, with nearly 60,000 soldiers killed or missing. In March 1975, a new offensive by the North Vietnamese army saw 100,000 soldiers invade the major cities of Quang Tri Province, Hue and Da Nang. Backed by powerful armored units and eight artillery regiments, the North Vietnamese army quickly occupied Quang Tri Province. On March 25, Hue, the third largest city in South Vietnam, fell to the North Vietnamese army.

　　In early April 1975, five weeks after the start of the campaign, the North Vietnamese Army had made remarkable progress. Twelve provinces of South Vietnam and more than eight million Vietnamese people were under North Vietnamese control. The South Vietnamese Army had lost its best troops, more than one-third of its soldiers, and almost half of its weapons.

On April 29th 1975, helicopters from the US Marines and Air Force, which had taken off from an American aircraft carrier offshore, began a large-scale airlift operation. Within 18 hours, more than 1,000 American citizens and nearly 7,000 South Vietnamese refugees fled Saigon. At 4:03 am on April 30th 1975, two marines were killed in a rocket attack at Tan Son Nhat Airport in Saigon. They became the last Americans to die in the Vietnam War. As dawn broke, the last remaining Marines guarding the American Embassy withdrew. Hours later, looters ransacked the embassy, and North Vietnamese tanks marched into Saigon, bringing the Vietnam War to an end. Over a period of about 15 years, nearly one million soldiers from the North Vietnamese Army and the Viet Cong, 250,000 soldiers from the South Vietnamese Army, and 58,000 American soldiers died, and hundreds of thousands of civilians lost their lives.