"Vietnam: On the Frontlines Part 2: Tet in Saigon and Hue War" (45:08) In January 1968, both the NVA and the Viet Cong launch a series of massive attacks on every major city in South Vietnam during Tet, the Vietnamese New Year. The two most important cities in South Vietnam are the scenes for some of the bloodiest fighting of the war. Though both are decisive U.S. military victories, the Tet Offensive is the biggest political crisis of Lyndon Johnson's presidency.