William Westmoreland

Recorded sideUnited States and South Vietnam (ARVN) / allies

Recorded resultbattlefield victory; strategic/political shock

A coordinated surprise assault during the Tet lunar new year truce. US and ARVN forces repelled the offensive within weeks and inflicted catastrophic losses on the attackers, especially the Viet Cong, who never fully recovered. Yet the scale and audacity of the attacks — televised, including fighting at the US Embassy in Saigon — shattered US public confidence in official claims that the war was being won.

Militarily it failed — the hoped-for popular uprising did not occur and communist forces were decimated. Politically it succeeded because it contradicted US government optimism, amplified by media coverage; it eroded American public will, contributed to President Johnson's decision not to seek re-election, and shifted US policy toward negotiation and 'Vietnamization.'

What followed

The clearest modern case of a battlefield defeat that produced a strategic/psychological victory. Widely regarded as the turning point of the Vietnam War and a landmark example of how public opinion and media narrative can outweigh tactical outcomes.

Recorded sideUnited States and South Vietnam

Recorded resultbase held; siege lifted by Operation Pegasus

PAVN forces besieged the Marine base for roughly 77 days. Massive US firepower — sustained tactical air, B-52 strikes (Operation Niagara), and artillery — broke up PAVN concentrations. The overland relief Operation Pegasus lifted the siege and the base held, though the US controversially abandoned Khe Sanh months later.

Fixed fortifications plus overwhelming, continuously coordinated air and artillery firepower allowed a defending garrison to survive prolonged encirclement and inflict disproportionate losses on the besiegers. Comparisons to Dien Bien Phu drove intense US command attention and resources.

What followed

Symbolically potent siege that ran concurrently with the Tet Offensive and dominated US attention; debated ever since as to whether it was a genuine PAVN objective or a diversion. Demonstrated the decisiveness of US airpower in defending an isolated position.