The Battle of Khe Sanh was a siege of a US Marine combat base in northwestern South Vietnam, lasting from 21 January to about 9 July 1968, with the heaviest fighting in the first 77 days1. Some 6,000 Marines held the base1 against a much larger North Vietnamese force, backed by a massive American bombing campaign. The siege was lifted and the base held, but its purpose, whether it was decisive or a diversion from the Tet Offensive, is still debated, and the base was abandoned months later.
For 77 days the world watched Khe Sanh, a lonely Marine base in the hills near the Laotian border, ringed by North Vietnamese divisions. American commanders feared a second Dien Bien Phu2; they were determined it would not be.
Part of The greatest battles in American history · Before: The Battle of Ia Drang · Next: The Tet Offensive
The base in the hills
Khe Sanh Combat Base sat near the border with Laos, astride infiltration routes and surrounded by hills. In early 1968 American intelligence detected a large North Vietnamese buildup around it3, and the US command chose to reinforce and hold the base, seeing a chance to draw the enemy into a battle of firepower.
The siege begins
In late January North Vietnamese forces cut the roads, seized the surrounding high ground, and pinned the Marines in a tightening siege, bombarding the base with artillery and rockets and attacking its hilltop outposts. The defenders, under David Lownds, dug in and held.
Steel from the sky
What saved Khe Sanh was airpower. Under a round-the-clock effort, American aircraft, including waves of B-52 bombers1, dropped an immense tonnage of bombs on the besieging forces, among the heaviest concentrations of the war. Transport planes braved the fire to keep the base supplied.
Relief and abandonment
In April a relief operation reopened the road and lifted the siege1, and the North Vietnamese drew off. The base had held. Yet only months later the Americans quietly abandoned Khe Sanh4, dismantling the position they had fought so hard to keep, which fueled lasting debate about why it had been held at all.
Why Khe Sanh mattered
Khe Sanh became one of the most watched and argued-over actions of the war. Some see it as a costly North Vietnamese failure, broken by American firepower; others as a deliberate diversion that pulled attention away from the Tet Offensive launched days into the siege2. Its later abandonment left the question of its purpose unresolved.
