The Tet Offensive of 1968 was a coordinated surprise attack by North Vietnamese forces against US and South Vietnamese forces during the Vietnamese lunar new year festival of Tet. Though the North Vietnamese forces were ultimately defeated, the offensive had important strategic and political impacts. It shook US public support for the war by highlighting weaknesses in US and South Vietnamese forces and contradicting previous claims of military success. While the US and South Vietnam fought off the attacks, the extensive media coverage of the brutality of the war eroded trust in US political and military leaders and their assessments of the conflict. This began a decline in support for continuing the war and influenced President Johnson's decision not to seek re-election.