| | 48 B.C. | Battle of Pharsalus. Caesar overwhelmingly defeated Pompey. |
| | 378 | A Roman army of 50,000 legionaires was engaged and cut to pieces by Gothic heavy cavalry near the town of Adrinople marking the end of infantry dominance on the battle field for the next 1,000 years. |
| | 1623 | Battle of Stadtlohn, Westphalia. Duke Christian of Brunswick foolishly gave battle to pursuing Catholics and was overwhelmingly defeated. He never again held military command. |
| | 1842 | The US-Canada border defined by the Webster-Ashburton Treaty. |
| | 1862 | Battle of Cedar Mountain. Union forces rebuffed by Confederates suffering heavy casualties. |
| | 1885 | Santa Anna defeated by rebel forces at Acapulco. |
| | 1945 | Atom Bomb dropped on Nagasaki. |