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Politics & World • War Crime

My Lai Massacre

The My Lai Massacre was the killing of Vietnamese civilians by U.S.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 27, 2026|2 min read| Fact-checked

The My Lai Massacre was the killing of Vietnamese civilians by U.S. Army soldiers on 16 March 1968 during the Vietnam War. It is widely regarded as one of the most infamous war crimes committed by U.S. forces in Vietnam, with estimated death tolls ranging from about 347 to 504 civilians.

Background

My Lai was a hamlet in Sơn Mỹ village in Quảng Ngãi province, South Vietnam, an area seen by U.S. forces as a suspected Viet Cong stronghold during the Vietnam War. The attack occurred during a search-and-destroy operation in March 1968.

The killings

On 16 March 1968, members of Charlie Company entered My Lai and killed large numbers of civilians over a period of hours. Accounts consistently describe the victims as largely unarmed villagers rather than enemy combatants.

Investigation and trial

The massacre was later investigated after it was reported by whistleblowers and journalists. Lieutenant William Calley was court-martialed and convicted, while most other accused personnel were not convicted.

Historical impact

The massacre intensified criticism of the Vietnam War and became one of the most widely remembered examples of U.S. military abuse in the conflict. It is often cited in discussions of war crimes, military accountability, and civilian protection.

Key facts

  • The killings took place in the hamlet of My Lai 4 in Sơn Mỹ village, Quảng Ngãi province.
  • Most victims were unarmed civilians, including women, children, and elderly men.
  • Estimates of the number killed vary, but commonly cited figures range from 347 to 504.
  • The massacre was carried out by soldiers of Charlie Company, Americal Division.
  • Lieutenant William Calley was convicted in connection with the killings; he was the only person convicted.
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Canadian context

Canadian readers encounter the My Lai Massacre mainly as a key case in modern military history, war-crimes accountability, and Vietnam War studies, topics that are widely taught and discussed in Canadian history and international relations contexts.

Frequently asked questions

What was the My Lai Massacre?
It was the killing of Vietnamese civilians by U.S. Army soldiers in My Lai, South Vietnam, on 16 March 1968, during the Vietnam War.
How many people were killed?
Sources give different estimates, commonly ranging from about 347 to 504 civilians.
Who was held responsible?
Lieutenant William Calley was convicted in connection with the killings and was the only person convicted.
Why is My Lai historically important?
It became a major symbol of war crimes and helped deepen U.S. public opposition to the Vietnam War.
Where did the massacre happen?
It happened in My Lai 4, part of Sơn Mỹ village in Quảng Ngãi province, South Vietnam.

References

  1. Wikipedia — https://en.wikipedia.org/wiki/My_Lai_massacre
    Supports: Date, location, perpetrators, and estimated death toll range.
  2. Encyclopaedia Britannica — https://www.britannica.com/event/My-Lai-Massacre
    Supports: Definition of the event, date, and approximate number of victims.
  3. PBS — https://www.pbs.org/wgbh/americanexperience/features/vietnam-my-lai-massacre/
    Supports: Chronology, aftermath, investigation, and Calley's conviction.
  4. Digital History, University of Houston — https://www.digitalhistory.uh.edu/active_learning/explorations/vietnam/vietnam_mylai.cfm
    Supports: Unit involved, context, and conviction of William Calley.
  5. BBC Radio 4 — https://www.bbc.co.uk/radio4/1968/mylai.shtml
    Supports: Historical significance and estimate that as many as 500 civilians were killed.