The Tet Offensive, or officially called The General Offensive and Uprising of Tet Mau Than 1968 by North Vietnam and the NLF, was one of the largest military campaigns of the Vietnam War, launched on January 30, 1968, by forces of the Viet Cong and North Vietnamese People's Army of Vietnam against the forces of the South Vietnamese Army of the Republic of Vietnam, the United States Armed Forces, and their allies. It was a campaign of surprise attacks against military and civilian command and control centers throughout South Vietnam. The name of the offensive comes from the Tết holiday, the Vietnamese New Year, when the first major attacks took place.
The North Vietnamese launched a wave of attacks in the late night hours of 30 January in the I and II Corps Tactical Zones of South Vietnam. This early attack did not lead to widespread defensive measures.