Following their successful siege of Montségur, French royal forces burned about 210 Cathar Perfecti and unrepentant credentes.

The United States Congress authorized the establishment of the US Army Corps of Engineers in order to operate the US Military Academy at West Point, New York.

American scientist Robert H. Goddard launched the world's first liquid-fueled rocket, which flew for two-and-a-half seconds before falling to the ground.

Former Prime Minister of Italy Aldo Moro (pictured) was kidnapped in Rome by Mario Moretti and the Red Brigades.

Iran–Iraq War: Iraqi forces began attacking the Kurdish town of Halabja with chemical weapons, killing up to 5,000 people.