The second Gulf of Tonkin attack

The second Gulf of Tonkin attack
	FALSE
	"On August 4, 1964, North Vietnamese patrol boats launched a second, unprovoked attack on US Navy destroyers in international waters in the Gulf of Tonkin."
Domain	Politics & Elections
Tactic	Fabrication; Propaganda Technique;
Era	Historical
First seen	1964
Origin	Announcement by President Lyndon B. Johnson in a televised address on the night of August 4, 1964, based on reports from the destroyers and on signals intelligence
Last reviewed	2026-10-27
	Further reading: books on Politics & Elections

The claim that North Vietnam launched a second attack in the Gulf of Tonkin on August 4, 1964, was the immediate justification for a major escalation of the Vietnam War. President Lyndon B. Johnson announced the attack on national television that night and ordered retaliatory air strikes. Three days later Congress passed the Gulf of Tonkin Resolution, which gave the president broad authority to use military force in Southeast Asia and became the legal basis for the war. There had been a real clash on August 2, but the second attack almost certainly never happened. Doubts were raised within hours by the commander on the scene, and declassified intelligence studies later concluded that the evidence had been misread and selectively presented.

The claim

On August 2, 1964, three North Vietnamese torpedo boats attacked the destroyer USS Maddox, which was conducting an intelligence-gathering patrol near the North Vietnamese coast. The Maddox and US aircraft damaged the boats. On the night of August 4, the Maddox and a second destroyer, the USS Turner Joy, reported that they were again under attack, firing at radar and sonar contacts for hours in bad weather. Johnson told the nation that renewed hostile actions had been taken against US ships on the high seas and that the reply was being given as he spoke.

What the evidence shows

Doubts on the scene. Within hours, Captain John J. Herrick, commander of the destroyer patrol, cabled that a review of the action made many reported contacts and torpedoes doubtful. He attributed them to freak weather effects on radar and overeager sonarmen and recommended a complete evaluation before further action. No one aboard saw enemy boats, and no damage or debris was found.
Signals intelligence. Officials cited intercepted North Vietnamese communications as confirmation. A study by National Security Agency historian Robert Hanyok, completed in 2001 and declassified in 2005, concluded that the intercepts had been mistranslated or related to the August 2 clash, and that intelligence officials presented only the material that seemed to support an attack while omitting the large body of evidence that none had occurred.
Later acknowledgments. In 1995 former Defense Secretary Robert McNamara met former North Vietnamese defense minister Vo Nguyen Giap, who said no attack had taken place on August 4. McNamara later acknowledged that the second attack probably did not happen. Johnson himself reportedly remarked privately in 1965 that, for all he knew, the Navy had been shooting at whales out there.
Context omitted. The administration did not tell Congress or the public that the destroyers' patrols were linked to covert South Vietnamese raids on the North Vietnamese coast, which helps explain the August 2 attack.

Consequences

On August 7, 1964, the Gulf of Tonkin Resolution passed the House 416 to 0 and the Senate 88 to 2; only Senators Wayne Morse and Ernest Gruening voted against it. Johnson and his successor used it to justify the deployment of more than half a million US troops. Congress repealed the resolution in 1971, and the episode contributed to the War Powers Resolution of 1973, which sought to limit presidents' ability to commit forces without congressional approval.

Why it persists

The Gulf of Tonkin incident is now widely cited as a case of war launched on faulty or manipulated intelligence. It illustrates how ambiguous evidence can be interpreted to fit a decision already favored, how quickly legislatures can grant sweeping powers in a moment of crisis, and how corrections can arrive decades too late to matter.

Lessons for readers

Be cautious about claims of attacks made in the first hours of a crisis.
Ask whether people on the scene have confirmed what officials are announcing.
Notice when evidence is described as conclusive but not shared.
Look for omitted context, such as provocations or covert operations.
Broad emergency powers granted quickly can outlast the facts that justified them.

Sources

Robert J. Hanyok, "Skunks, Bogies, Silent Hounds, and the Flying Fish: The Gulf of Tonkin Mystery, 2–4 August 1964," Cryptologic Quarterly (National Security Agency, declassified 2005).
Edwin E. Moïse, Tonkin Gulf and the Escalation of the Vietnam War (University of North Carolina Press, 1996; revised 2019).
Robert S. McNamara, In Retrospect: The Tragedy and Lessons of Vietnam (Times Books, 1995).
Gulf of Tonkin Resolution, Public Law 88-408 (1964).