The battle of Khe Sanh was important not because of its immediate outcome, but because it attracted worldwide media attention and, along with the simultaneous Tet Offensive, demonstrated the futility of America’s efforts to contain their enemy. In 1962 an American Special Forces team arrived in Khe Sanh Town to train local Bru minority people in counter-insurgency, and then four years later the first batch of Marines was sent in to establish a forward base near Laos, to secure Highway 9 and to harass troops on the Ho Chi Minh Trail. Skirmishes around Khe Sanh increased as intelligence reports indicated a massive build-up of North Vietnamese Army (NVA) troops in late 1967, possibly as many as forty thousand, facing six thousand Marines together with a few hundred South Vietnamese and Bru. Both the Western media and American generals were soon presenting the confrontation as a crucial test of America’s credibility in South Vietnam and drawing parallels with Dien Bien Phu. As US President Johnson famously remarked, he didn’t want "any damn Dinbinfoo".
The NVA attack came in the early hours of January 21, 1968; rockets raining in on the base added to the terror and confusion by striking an ammunition dump, gasoline tanks and stores of tear gas. There followed a seemingly endless, nerve-grinding NVA artillery barrage, when hundreds of shells fell on the base each day, interspersed with costly US infantry assaults into the surrounding hills. In an operation code-named "Niagara" General Westmoreland called in the air battalions to silence the enemy guns and break the siege by unleashing the most intense bombing raids of the war: in nine weeks nearly a hundred thousand tonnes of bombs pounded the area round the clock, averaging one airstrike every five minutes, backed up by napalm and defoliants. Unbelievably the NVA were so well dug in and camouflaged that they not only withstood the onslaught but continued to return fire, despite horrendous casualties, estimated at ten thousand. On the US side around five hundred troops died at Khe Sanh (although official figures record only 248 American deaths, of which 43 occurred in a single helicopter accident), before a relief column broke through in early April, seventy-odd days after the siege had begun. NVA forces gradually pulled back and by the middle of March had all but gone, having successfully diverted American resources away from southern cities prior to the Tet Offensive. Three months later the Americans also quietly withdrew, leaving a plateau that resembled a lunar landscape, contaminated for years to come with chemicals and explosives; even the trees left standing were worthless because so much shrapnel was lodged in the timber.