Spanish explorer Diego García de Palacio first sights the ruins of the ancient Mayan city of Copán.
The Safavid Empire of Iran is defeated by an army from Afghanistan at the Battle of Gulnabad, pushing Iran into anarchy.
American Civil War: The Naval Battle of Hampton Roads begins.
World War I: A British force unsuccessfully attempts to relieve the siege of Kut (present-day Iraq) in the Battle of Dujaila.
Spanish Civil War: The Battle of Guadalajara begins.
World War II: Imperial Japanese Army forces gave ultimatum to Dutch East Indies Governor General Jonkheer Tjarda van Starkenborgh Stachouwer and KNIL Commander in Chief Lieutenant General Hein Ter Poorten, to unconditionally surrender.
Egypt re-opens the Suez Canal after the Suez Crisis.
Thirty-five hundred United States Marines are the first American land combat forces committed during the Vietnam War.
Malaysia Airlines Flight 370, carrying a total of 239 people, disappears en route from Kuala Lumpur to Beijing.