User:Hawkeye7/War/Selected anniversaries/May 31

May 31

 * 1223 - Battle of the Kalka River between the Mongol armies of Genghis Khan and East Slavic warriors.
 * 1862 - American Civil War: The Battle of Seven Pines.
 * 1864 - American Civil War: The Battle of Cold Harbor begins.
 * 1902 - Second Boer War: The last Afrikaner resistance forces sign a peace treaty with the British at Pretoria, ending the war, and ensuring British control of South Africa.
 * 1916 - World War I: The German and British navies clash in the Battle of Jutland, the largest naval battle of the war.
 * 1942 - World War II: Imperial Japanese Navy midget submarines begin a series of attacks on Sydney, Australia; the Luftwaffe bombs Coventry, England.