The Ernest Medina Court-Martial: Command Responsibility After My Lai

When a war crime is committed by the troops on the ground, how far up the chain of command does criminal liability climb? The 1971 court-martial of Captain Ernest L. Medina, the company commander whose soldiers carried out the My Lai massacre, forced American military law to answer that question directly. The answer the case produced, often called the “Medina standard,” still governs how courts-martial decide when a commander is criminally responsible for the crimes of his subordinates. It is also why Medina walked free while his platoon leader did not.

What happened

On the morning of March 16, 1968, soldiers of Charlie Company, 1st Battalion, 20th Infantry, entered the hamlet of My Lai in Quang Ngai Province, Vietnam, and killed several hundred unarmed civilians, most of them women, children, and elderly men (PBS, “American Experience: My Lai”). The Army’s later Peers inquiry put the death toll at roughly 347; a Vietnamese count was higher (Peers Report, March 1970). Medina commanded Charlie Company. The day before the assault he had briefed his troops that they would face the 48th Viet Cong Battalion, intelligence that proved badly wrong, and ordered the village destroyed; what exactly he said about civilians was disputed throughout the case (Howard Jones, My Lai: Vietnam, 1968, and the Descent into Darkness, Oxford University Press, 2017).

The killing was not exposed for more than a year. A former door gunner, Ronald Ridenhour, gathered accounts from Charlie Company soldiers and in March 1969 sent a letter to officials in Washington; investigative reporter Seymour Hersh broke the story publicly that November (The New York Times, contemporary coverage, 1969-1971). A three-star general, William R. Peers, was appointed to investigate both the massacre and the cover-up, and his inquiry recommended charges against more than two dozen officers and enlisted men (Peers Report, March 1970).

Medina was charged not for personally directing the slaughter, which the evidence never clearly showed, but on a theory of command responsibility under Article 77 of the Uniform Code of Military Justice, the provision that makes one who aids and abets an offense liable as a principal (Washington Post obituary, May 14, 2018). By the time of trial the charges were involuntary manslaughter of “no less than 100” Vietnamese civilians, premeditated murder of one woman Medina admitted shooting, and assault on a prisoner (famous-trials.com, “Ernest Lou Medina,” UMKC). His trial ran from August 16 to September 22, 1971, at Fort McPherson, Georgia, before a panel of five combat officers, with the prominent civilian defense lawyer F. Lee Bailey leading his defense (HISTORY, “Medina is acquitted of all charges,” September 22, 1971).

The legal lesson: the knowledge requirement

The doctrine on trial was command responsibility, and Medina is the case where American military law fixed its threshold. The starting point was the post-World War II precedent of In re Yamashita, in which a Japanese general was held liable, and executed, for atrocities his troops committed in the Philippines. The Yamashita standard was broad: a commander could be responsible where he “should have known” of widespread crimes and made no effective effort to discover and stop them (Smidt, “Yamashita, Medina, and Beyond,” Military Law Review, Vol. 164, 2000).

The military judge in the Medina case, Colonel Kenneth Howard, instructed the panel on a markedly narrower rule. To convict Medina, the prosecution had to prove that he had actual knowledge that his men were killing noncombatants, that he failed to take the steps within his power to stop them, and that his inaction was a proximate cause of the deaths (Smidt, Military Law Review, 2000). This was a deliberate move away from Yamashita’s “should have known” toward a true knowledge requirement. A commander who genuinely did not know, the instruction held, could not be convicted simply because a reasonable officer in his position would have known.

That distinction decided the case. The prosecution, led by Major William Eckhardt, argued that Medina knew the killing was underway and chose to ignore it, and that “by his inaction” he aided and abetted the slayings (HISTORY, September 22, 1971). But the government’s own witnesses could not place Medina within sight of the mass shootings while they were happening, and a key witness withdrew while Medina’s radio operator refused to testify even under a grant of immunity (Howard Jones, My Lai, 2017). The defense countered that Medina did not grasp the scale of the killing until he saw bodies later that morning, and that the cease-fire he then ordered, which his troops obeyed at once, proved both that he could control the company and that he had not knowingly let it run wild (HISTORY, September 22, 1971). Against the “actual knowledge” instruction, that argument held. The panel deliberated about an hour and acquitted on every charge (Washington Post, May 14, 2018).

The contrast with Medina’s platoon leader sharpens the lesson. Lieutenant William Calley was convicted on March 29, 1971, of the premeditated murder of 22 civilians (HISTORY, “Calley found guilty of My Lai murders,” March 29, 1971). Calley’s liability was direct: he gave and carried out the orders to shoot, and his defense that he was only obeying Medina failed because a manifestly unlawful order is no defense. Medina’s liability, by contrast, was derivative; it depended entirely on what he knew and when. Calley pulled triggers and the law reached him through Article 118 murder. Medina did not, and the law could reach him only through a knowledge-based command-responsibility theory that the evidence did not satisfy. Same massacre, two very different routes to liability, two opposite verdicts.

Outcome and why it matters

The five officers acquitted Medina of all charges on September 22, 1971 (HISTORY, September 22, 1971). He was the company commander at one of the most documented atrocities in American military history, and he was found not guilty. Of the 26 people charged in connection with My Lai or its cover-up, only Calley was ultimately convicted (military.com, “War Criminal or Scapegoat”). Acquittal did not restore Medina’s career; the Army declined his long-expected promotion, and he resigned his commission and left the service weeks later (Washington Post, May 14, 2018). He never spoke publicly about the massacre and died in Wisconsin in 2018 at age 81 (WRAL, May 2018).

The lasting product of the case is the “Medina standard” itself: in American military law, a commander is criminally liable for subordinates’ war crimes only on proof that he had actual knowledge of the violations and failed to act to stop or prevent them (Wikipedia, “Command responsibility”; Smidt, Military Law Review, 2000). It is a more forgiving rule than the international “should have known” or “reason to know” tests, and scholars have argued it helps explain why so few American commanders faced criminal consequences for Vietnam-era crimes (Smidt, Military Law Review, 2000). The chief investigator, General Peers, disagreed with several of the My Lai outcomes, and Medina himself later acknowledged he had “not been completely candid” at trial (Washington Post, May 14, 2018). Whatever one makes of that, the legal rule the case set is clear and durable. Command responsibility in a court-martial turns on knowledge. A commander is answerable for what his troops do when, and to the extent that, he knew and did nothing. That is the question every later command-responsibility prosecution has had to start from, and it is the question Medina’s panel answered in his favor.

Sources

• PBS, “American Experience: My Lai” and “Meet the Participants,” pbs.org
• Lieutenant General William R. Peers, Report of the Investigation (Peers Report), March 1970
• HISTORY, “Captain Ernest Medina is acquitted of all My Lai Massacre charges,” September 22, 1971
• HISTORY, “Lt. William Calley found guilty of My Lai murders,” March 29, 1971
• The Washington Post, “Ernest Medina, company commander acquitted in My Lai Massacre, dies at 81,” May 14, 2018
• WRAL, “Ernest Medina, Army Captain Acquitted in My Lai Massacre, Dies at 81,” May 2018
• famous-trials.com, “Ernest Lou Medina,” University of Missouri-Kansas City School of Law, Famous Trials Collection
• Michael L. Smidt, “Yamashita, Medina, and Beyond: Command Responsibility in Contemporary Military Operations,” Military Law Review, Vol. 164 (2000)
• Howard Jones, My Lai: Vietnam, 1968, and the Descent into Darkness, Oxford University Press (2017)
• Wikipedia, “Command responsibility” (Medina standard)
• military.com, “War Criminal or Scapegoat: William Calley and the Enduring Memory of the My Lai Massacre”

This article is general legal and historical information, not legal advice.