Primary Sources: Vietnam War

The Gulf of Tonkin incident (Vietnamese: Sự kiện Vịnh Bắc Bộ) was an international confrontation that led to the United States engaging more directly in the Vietnam War. It involved both a proven confrontation on August 2, 1964, carried out by North Vietnamese forces in response to covert operations in the coastal region of the gulf and a second, claimed confrontation on August 4, 1964, between ships of North Vietnam and the United States in the waters of the Gulf of Tonkin. Originally American claims blamed North Vietnam for both attacks. Later investigation revealed that the second attack never happened; the American claim that it had was based mostly on erroneously interpreted communications intercepts. The outcome of these two confrontations was the passage by the U.S. Congress of the Gulf of Tonkin Resolution, which granted U.S. President Lyndon B. Johnson the authority to assist any Southeast Asian country whose government was considered to be jeopardized by "communist aggression". The resolution served as Johnson's legal justification for deploying U.S. conventional forces and the commencement of open warfare against North Vietnam. Wikipedia