The Tet Offensive was a series of surprise attacks launched by North Vietnamese and Viet Cong forces on 30 to 31 January 19681, during a holiday truce, against cities and bases across South Vietnam. Militarily it failed, the attacks were repulsed and the Viet Cong suffered crippling losses1, but the shock of seeing the enemy strike everywhere at once, including the US embassy in Saigon, turned American public opinion against the war. It is one of history's clearest examples of a battle lost on the ground but won in its effect.
American commanders had said the enemy was beaten and the end was in sight. Then, during the Tet holiday truce of 1968, the enemy attacked everywhere at once, and the war Americans thought they understood was never the same.
Part of The greatest battles in American history · Before: The Battle of Khe Sanh
The promise of light at the end of the tunnel
By late 1967 American leaders assured the public that the Vietnam War was being won and that there was light at the end of the tunnel. North Vietnam planned a massive surprise blow to shatter that confidence and spark a general uprising, timed for the Tet lunar new year, when a truce was expected.2
Attacks across the country
On 30 and 31 January 1968, communist forces struck dozens of cities, towns and bases across South Vietnam almost simultaneously. The scale and audacity stunned the Americans and South Vietnamese, who had not expected the enemy capable of such a coordinated nationwide assault.
Saigon and Hue
In Saigon, a Viet Cong team even attacked the grounds of the US embassy3, a shock broadcast around the world. The hardest fighting came at Hue, the old imperial capital, which the communists seized and held for weeks2 before US Marines and South Vietnamese troops retook it street by street in brutal urban combat.
A military defeat
Almost everywhere the attacks were thrown back within days or weeks, at enormous cost to the attackers. The hoped-for popular uprising never came1, and the Viet Cong were so badly mauled that much of the fighting afterward fell to the North Vietnamese army. By any battlefield measure, Tet was a defeat for those who launched it.
Why Tet changed the war
Yet Tet changed the course of the war. The gap between official optimism and the images of fighting in Saigon and Hue broke American trust in the war's progress. Public support fell sharply2, the US commander's request for more troops was refused, and President Johnson chose not to seek re-election4. The United States began the long search for a way out, making Tet the turning point of the war despite being a battlefield failure. It unfolded alongside the siege of Khe Sanh.
