| | 1644 | Battle of Montijo. Portuguese troops under Alburquerque defeated Spanish forces near Badajos. Spain left Portugal alone for a while. |
| | 1904 | Battle of Nanshan Hill. Taking heavy casualties, Japanese isolate Russians in Port Arthur. |
| | 1940 | British begin evacuation from France at Dunkirk. |
| | 1940 | French port of Calais taken by German 10th Panzer Division. |
| | 1946 | Patent filed in US for the H-Bomb. |