In the few years since U.S. combat forces entered Vietnam, the Tet New Year usually brought with it an informal ceasefire. But on January 31, 1968, Viet Cong and North Vietnamese soldiers launched a massive countrywide attack throughout South Vietnam. This began a two-month string of battles that would kill more than 15,000 American and Allied troops and trigger fierce anti-war protests across the United States. This is the story of the Tet Offensive, told through rare media reports and combat footage, much of which has never been seen or has not been broadcast since 1968.