Wikipedia:Selected anniversaries/July 31
July 31: Qi Xi in the Chinese lunar calendar (2006), Ka Hae Hawai‘i Day in Hawai'i, feast day of Saint Ignatius of Loyola.
- 1667 - The signing of the Treaty of Breda ended the Second Anglo-Dutch War.
- 1777 - French nobleman Marquis de Lafayette entered the American revolutionary forces as a Major General.
- 1917 - World War I: The Battle of Passchendaele began in West Flanders, Belgium.
- 1941 - Holocaust: Hermann Göring ordered SS general Reinhard Heydrich to develop a "final solution to the Jewish question".
- 1971 - Apollo program: The first Lunar Rover (pictured) was used during the Apollo 15 mission to the moon.