War dominated 30 years of Vietnam's history last century. The struggle that began with communists fighting French colonial power in the 1940s did not end until they seized Saigon and control of the whole country in 1975. The period that Americans refer to as the "Vietnam War" - and the Vietnamese call the "American War" - was the US military intervention from 1965 to 1973.
The Vietnam War was a long, costly armed conflict that pitted the communist regime of North Vietnam and its southern allies, known as the Viet Cong, against South Vietnam and its principal ally, the United States. The divisive war, increasingly unpopular at home, ended with the withdrawal of U.S. forces in 1973 and the unification of Vietnam under Communist control two years later. More than 3 million people, including 58,000 Americans, were killed in the conflict.
The US was driven by Cold War concerns about the spread of communism, particularly "domino theory" - the idea that if one Asian nation fell to the leftist ideology, others would quickly follow. The Vietnam War was protracted and bloody. The Hanoi government estimates that in 21 years of fighting, four million civilians were killed across North and South Vietnam, and 1.1 million communist fighters died.
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The United States began drastically reducing their troop support in South Vietnam during the final years of Vietnamization. Many U.S. troops were removed from the region, and on 5 March 1971, the United States returned the 5th Special Forces Group, which was the first American unit deployed to South Vietnam, to its former base in Fort Bragg, North Carolina.
Under the Paris Peace Accords, between North Vietnamese Foreign Minister Lê Đức Thọ and U.S. Secretary of State Henry Kissinger, and reluctantly signed by South Vietnamese president Thiệu, U.S. military forces withdrew from South Vietnam and prisoners were exchanged. North Vietnam was allowed to continue supplying communist troops in the South, but only to the extent of replacing expended materiel. Later that year the Nobel Peace Prize was awarded to Kissinger and Thọ, but the Vietnamese negotiator declined it saying that a true peace did not yet exist.
The communist leaders had expected that the ceasefire terms would favor their side. But Saigon, bolstered by a surge of U.S. aid received just before the ceasefire went into effect, began to roll back the Viet Cong. The communists responded with a new strategy hammered out in a series of meetings in Hanoi in March 1973, according to the memoirs of Trần Văn Trà.
As the Viet Cong's top commander, Tra participated in several of these meetings. With U.S. bombings suspended, work on the Ho Chi Minh trail and other logistical structures could proceed unimpeded. Logistics would be upgraded until the North was in a position to launch a massive invasion of the South, projected for the 1975-76 dry season. Tra calculated that this date would be Hanoi's last opportunity to strike before Saigon's army could be fully trained.
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