- Date:
- August 2, 1964 - August 4, 1964
- Location:
- Gulf of Tonkin
- Participants:
- United States
- Vietnam
- Context:
- Gulf of Tonkin Resolution
- Vietnam War
Gulf of Tonkin incident
-
What was the Gulf of Tonkin incident?
The Gulf of Tonkin incident refers to events occurring from August 2 to August 4, 1964, in the Gulf of Tonkin off Vietnam, during the Vietnam War. The incident was presented to the U.S. Congress as two unprovoked attacks by North Vietnamese torpedo boats on the U.S. destroyers Maddox and Turner Joy.
The Johnson administration used the incident to obtain Congressional approval for the Gulf of Tonkin Resolution, which granted President Lyndon B. Johnson broad authority to take action to safeguard U.S. interests in Southeast Asia. Although doubts concerning the second attack existed, retaliatory air strikes were ordered against North Vietnamese naval bases. The resolution served as the principal constitutional authorization for the subsequent vast escalation of the United States’ military involvement in the Vietnam War.
4 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
Where is the Gulf of Tonkin located?
The Gulf of Tonkin is a northwest arm of the South China Sea, bordered by China to the north and east, Hainan Island to the east, and northern Vietnam to the west. It is approximately 300 miles (500 km) long and 150 miles (250 km) wide, with depths of up to 230 feet (70 meters). The gulf is also the entry point for the Red River and is home to the ports of Ben Thuy and Haiphong in northern Vietnam, as well as Beihai (Pakhoi) in China.
The Gulf of Tonkin is known for the Gulf of Tonkin incident in 1964, which led to increased U.S. involvement in the Vietnam War, and for naval activity in 1972 when the U.S. Navy mined North Vietnamese ports.
3 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
Which countries were involved in the incident?
The Gulf of Tonkin incident involved the United States and North Vietnam in August 1964. The incident occurred when North Vietnamese torpedo boats allegedly attacked the U.S. destroyers Maddox and Turner Joy. These events led to the Gulf of Tonkin Resolution, which allowed President Lyndon B. Johnson to increase U.S. military involvement in the Vietnam War. China and the Soviet Union also became involved by sending aid to North Vietnam.
4 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
What events happened during the Gulf of Tonkin incident in 1964?
The Gulf of Tonkin incident, a complex naval event, occurred in the Gulf of Tonkin off the coast of Vietnam from August 2 to August 4, 1964.
The U.S. destroyers Maddox and Turner Joy were sent to the Gulf of Tonkin in 1964 to conduct reconnaissance and intercept North Vietnamese communications in support of South Vietnamese war efforts. On August 2, the USS Maddox was attacked by North Vietnamese torpedo boats while on patrol. On August 4, the two ships reported a second attack by torpedo boats.
These reported attacks led President Lyndon B. Johnson to request congressional support for a resolution authorizing him to take action in Southeast Asia. The Gulf of Tonkin Resolution passed overwhelmingly on August 7, granting Johnson broad authority and leading to direct U.S. involvement in the Vietnam War.
4 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
How did the Gulf of Tonkin incident affect the Vietnam War?
The Gulf of Tonkin incident was a complex naval event in the Gulf of Tonkin off the coast of Vietnam in August 1964. President Lyndon B. Johnson presented it to the U.S. Congress as two unprovoked attacks by North Vietnamese torpedo boats on U.S. destroyers.
This led to the Gulf of Tonkin Resolution, which Congress passed, allowing Johnson to take all necessary measures to repel any armed attack against the forces of the United States and to prevent further aggression. The resolution served as the principal constitutional authorization for the subsequent vast escalation of the United States’ military involvement in the Vietnam War. It granted Johnson the power to conduct a war in Vietnam without a formal declaration from Congress.
3 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
Why is the Gulf of Tonkin incident considered controversial today?
The Gulf of Tonkin incident remains controversial due to questions surrounding the events of August 4, 1964. The Gulf of Tonkin incident, a complex naval event, was presented to the U.S. Congress as two unprovoked attacks by North Vietnamese torpedo boats on U.S. destroyers Maddox. This led to the Gulf of Tonkin Resolution, which allowed President Lyndon B. Johnson to escalate U.S. military involvement in the Vietnam War.
Later, it was revealed that the report seeming to confirm the attack had been misinterpreted and there had not actually been an attack on August 4. In 1995, Vo Nguyen Giap, North Vietnam’s military commander, acknowledged the August 2 attack but denied the August 4 attack. The resolution was repealed in 1970 as the American public became disillusioned with the Vietnam War and viewed the resolution as giving the president a blank check to wage war.
2 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
Gulf of Tonkin incident, complex naval event in the Gulf of Tonkin, off the coast of Vietnam, that occurred from August 2 to August 4, 1964, during the Vietnam War. It was described to the U.S. Congress on August 5, 1964, as two unprovoked attacks by North Vietnamese torpedo boats on the U.S. destroyers Maddox and Turner Joy. The Gulf of Tonkin incident led to the Gulf of Tonkin Resolution, which allowed President Lyndon B. Johnson to greatly escalate U.S. military involvement in the war.
Reconnaissance and raids
The Maddox and the Turner Joy of the U.S. Seventh Fleet were sent to the Gulf of Tonkin in 1964 in order to conduct reconnaissance and to intercept North Vietnamese communications in support of South Vietnamese war efforts. At the same time, the Vietnamese navy was undertaking a mission under the oversight of the U.S. Department of Defense to attack radar stations, bridges, and other such targets along North Vietnam’s coasts.
On the night of July 30–31, 1964, South Vietnamese commandos attacked North Vietnamese radar and military installations on Hon Me and Hon Ngu islands in the Gulf of Tonkin. The Maddox, on patrol in the area but probably unaware of the raids that had taken place, observed torpedo boats sent out in pursuit of the South Vietnamese vessels and thus withdrew, but it returned on August 1.
Events of August 2
The following day, on August 2, the Maddox found that it was being approached by three North Vietnamese torpedo boats. The Maddox fired warning shots, but the torpedo boats continued and opened fire in return. The Maddox called in air support from a nearby carrier, the Ticonderoga. In the ensuing firefight, one of the torpedo boats was badly damaged, but the Maddox escaped harm.
The event led the U.S. to believe that North Vietnam was targeting its intelligence-gathering mission, and therefore the Turner Joy was sent to reinforce the Maddox. From the point of view of the Maddox, the attack had been unprovoked, though North Vietnam was under the impression that the Maddox had been involved in the raids on Hon Me and Hon Ngu islands.
Events of August 4
By the night of August 4, the U.S. military had intercepted North Vietnamese communications that led officials to believe that a North Vietnamese attack on its destroyers was being planned. Those communications most likely referred to operations to salvage the torpedo boat that had been damaged in the earlier firefight. That night proved to be a stormy one. The Maddox and Turner Joy moved out to sea, but both reported that they were tracking multiple unidentified vessels approaching their positions. The vessels appeared to be coming from several different directions, and they were impossible to lock onto.
Both ships began firing at what they thought were torpedo boats, and again they sought air support. A plane piloted by Commander James Stockdale joined the action, flying at low altitude to see the enemy ships. Stockdale reported seeing no torpedo boats. Several hours later, Captain John Herrick of the Maddox, after reviewing the events, sent the message, “Review of action makes many reported contacts and torpedoes fired appear doubtful. Freak weather effects on radar and overeager sonarmen may have accounted for many reports. …Suggest complete evaluation before any further action taken.”
Johnson’s response
Johnson and his advisers had approved retaliatory strikes on North Vietnamese naval bases as soon as the reports of the apparent attack of August 4 came in. Moreover, another intercepted report seemed to confirm that the attack had in fact taken place, and thus Herrick’s caution was not taken seriously. That report had been misinterpreted, however. It was in fact a more detailed report about the action on August 2, and there had not actually been an attack on August 4.
Secretary of Defense Robert McNamara and President Johnson were both convinced of the reality of the second attack, however, and thus they asked Congress to pass the Gulf of Tonkin Resolution. It passed the House and Senate easily, and Johnson signed it on August 10.
In 1995 Vo Nguyen Giap, who had been North Vietnam’s military commander during the Vietnam War, acknowledged the August 2 attack on the Maddox but denied that the Vietnamese had launched another attack on August 4, as the Johnson administration had claimed at the time.



