North Vietnam attacked 100 cities simultaneously during a ceasefire. It was a military disaster for them. It ended the war anyway — by destroying American public support for it.
In late January 1968, while American and South Vietnamese troops observed a truce for the Vietnamese Lunar New Year (Tết), North Vietnam and the Viet Cong launched the most audacious military operation of the Vietnam War. On January 30-31, 77,000 troops attacked over 100 cities and towns simultaneously — including Saigon, Hue, and 36 of South Vietnam's 44 provincial capitals. In Saigon, Viet Cong commandos briefly breached the US Embassy compound. For Americans watching television, it looked like the war was being lost.
The attack was a military catastrophe for North Vietnam. The anticipated popular uprising never materialized — South Vietnamese civilians did not join the revolt. The Viet Cong's Main Force units were decimated: approximately 45,000 killed in the first phase alone, losses so severe that the Viet Cong never fully recovered as an independent military force. The North Vietnamese regular army would have to carry the war from this point forward. By any conventional military measure, the US and South Vietnam had won.
The political damage to the United States was irreversible. For months, the Johnson administration had been running a 'success offensive' — public assurances that the war was being won, that the enemy was weakening, that the light at the end of the tunnel was visible. Westmoreland had declared in November 1967 that the Viet Cong were 'unable to mount a major offensive.' Tet made those claims look not just wrong but deliberately dishonest.
CBS anchor Walter Cronkite — 'the most trusted man in America' — traveled to Vietnam after Tet and reported on February 27, 1968, that the war appeared to be a stalemate and that the US should negotiate rather than fight on. Johnson watched the broadcast and reportedly said to an aide: 'If I've lost Cronkite, I've lost middle America.' Three weeks later, he announced he would not seek re-election.
The Battle of Hue, which lasted for 25 days, became the offensive's most brutal episode. Viet Cong and North Vietnamese forces occupied the ancient imperial city and executed an estimated 2,800 to 6,000 civilians — government officials, South Vietnamese military officers, teachers, priests, and people identified as 'class enemies.' The massacre was concealed during the war and debated for decades afterward.
The iconic photograph of the Tet Offensive — South Vietnamese General Nguyen Ngoc Loan executing a Viet Cong prisoner on a Saigon street with a pistol — appeared on front pages worldwide. The prisoner had just killed several South Vietnamese police officers and their families. The photograph, stripped of context, became a defining image of American disillusionment with the war. Its photographer, Eddie Adams, spent the rest of his life apologizing for what the image had done to Loan's reputation.
The Tet Offensive fundamentally broke the domestic political consensus that had sustained American involvement in Vietnam. After Tet, polls showed that a majority of Americans believed the decision to intervene had been a mistake. Congressional support eroded. The anti-war movement grew. Johnson's successor, Richard Nixon, was elected on a vague promise to achieve 'peace with honor' — but it took seven more years and 30,000 more American deaths before the last US personnel left Vietnam.