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The Gulf of Tonkin Incident: The Attack That Did Not Happen

How a reported second attack in August 1964 led to war, and what the NSA's own historian later found.

Quick answer

Did the Gulf of Tonkin attack happen?

Partly. On August 2, 1964, North Vietnamese patrol boats did engage the USS Maddox. But the reported second attack on August 4, which President Johnson used to win congressional approval for military action, did not happen. A study by NSA historian Robert Hanyok, declassified in 2005, concluded that signals intelligence had been misread and presented in a way that supported an attack that never occurred.

Timeline

  1. August 2, 1964Three North Vietnamese torpedo boats engage the destroyer USS Maddox in the Gulf of Tonkin.
  2. August 4, 1964The Maddox and USS Turner Joy report a second attack in bad weather. The crews' reports are confused.
  3. August 7, 1964Congress passes the Gulf of Tonkin Resolution, 416 to 0 in the House and 88 to 2 in the Senate.
  4. 1971Congress repeals the resolution.
  5. 2005The NSA releases historian Robert Hanyok's study concluding that no attack took place on August 4.

What is documented, and what is not

On the record

  • The August 2 clash happened.
  • The NSA's own internal history concluded the August 4 attack did not occur.
  • The Gulf of Tonkin Resolution authorized the escalation of US involvement in Vietnam.

Disputed or unproven

  • Whether officials knowingly misled Congress or sincerely believed the reports is still debated.

Common questions

What was the Gulf of Tonkin Resolution?

A 1964 joint resolution of Congress that authorized President Johnson to use military force in Southeast Asia without a declaration of war.

Who proved the second attack never happened?

NSA historian Robert Hanyok, in a classified study completed around 2001 and released in 2005.

Where can I read the declassified documents?

The NSA and the National Security Archive both published the Gulf of Tonkin materials in 2005.

Read the record yourself

Links go to official archives, museums, agencies and published research. Search links open the archive's own search for this topic.

THE FICTION BUILT ON THIS RECORD · FILE 066 · VOLUME XIThe Attack That Started the Vietnam War Never HappenedYou can be sure of something because you are told to be. The ocean does not care which.Read the first pages free →

Last reviewed 2026-10-13. This page covers the public record only. Archive files are dramatized and always marked as files.

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