August 21 in Military History

Nat Turner, an enslaved preacher in Southampton County, Virginia, led the deadliest slave rebellion in American history. Turner and his followers killed approximately 60 white men, women, and children before the uprising was suppressed. The rebellion terrified the slaveholding South and led to harsh new slave codes that tightened control over enslaved and free Black people.

Confederate guerrilla William Clarke Quantrill led approximately 450 raiders in a devastating attack on the Free State town of Lawrence, Kansas, killing nearly 200 unarmed men and boys and burning much of the town. The massacre was one of the worst atrocities of the Civil War and intensified the guerrilla conflict on the Kansas-Missouri border.

Italian handyman Vincenzo Peruggia walked the Mona Lisa out of the Louvre on the morning of August 21, 1911, in a theft that went undetected for 26 hours. The incident prompted systematic improvements in cultural property security that shaped later military monuments protection doctrine during the Second World War.

Russian revolutionary and founder of the Red Army Leon Trotsky died on August 21, 1940, a day after being attacked with an ice axe by Soviet NKVD agent Ramon Mercader at his fortified compound in Coyoacan, Mexico City, concluding a twelve-year Stalin campaign against the exiled Bolshevik leader.

Japanese reinforcements continued landing on Guadalcanal as the battle for Henderson Field intensified. The Japanese planned a major assault along what would become known as Edson's Ridge, setting the stage for one of the most desperate defensive battles in Marine Corps history.

Representatives from the United States, United Kingdom, Soviet Union, and China began meetings at Dumbarton Oaks in Washington, D.C., to plan the structure of the United Nations. The conference established the framework for the Security Council and its permanent members, the architecture of international security that endures to this day.

President Harry Truman signed an order on August 21, 1945, terminating the Lend-Lease program immediately upon Japanese surrender. The abrupt cutoff of wartime aid created a significant strain in Anglo-American and Soviet-American relations and set the pattern for the transition from wartime alliance to Cold War confrontation.

Hawaii was admitted as the 50th U.S. state, eighteen years after the Japanese attack on Pearl Harbor made the territory the most famous military installation in American history. Statehood formalized Hawaii's role as the strategic center of American military power in the Pacific.

Soviet and Warsaw Pact forces totaling approximately 250,000 troops entered Czechoslovakia on the night of August 20-21, 1968, ending the Prague Spring reform movement. The operation was the largest military movement in Europe since 1945 and established the Brezhnev Doctrine of limited sovereignty within the Soviet bloc.

U.S. military and coalition forces at Hamid Karzai International Airport processed roughly 8,000 evacuees on August 21, 2021, during the peak of Operation Allies Refuge, the largest non-combatant evacuation operation in American history. The operation would eventually airlift 124,000 people from Afghanistan before the August 30 withdrawal.