| 1. | Lord Howe defeated and almost destroyed the French fleet | 1794 |
| The British frigate Shannon captures the American frigate Chesapeake, off Boston | 1813 |
| McClellan defeated the Confederates at Fair Oaks, Virginia | 1862 |
| 2. | The Reign of Terror began | 1793 |
| 3. | Admiral Blake's decisive defeat of Van Tromp | 1653 |
| Lee defeated Grant at Cold Harbor | 1864 |
| Hobson sank the Merrimac in Santiago Harbor | 1898 |
| 4. | Kléber defeated the Austrians at Altenkirchen | 1796 |
| 5. | Pretoria taken by Lord Roberts | 1900 |
| 6. | Capture of Memphis, Tenn. | 1862 |
| 7. | Capture of Mamelon earthworks, at Sebastopol, by the French | 1855 |
| Siege of Jerusalem begun by the Crusaders | 1099 |
| 10. | The Russians defeated Napoleon at Hielsburg | 1807 |
| Russia captured Khiva | 1873 |
| The Confederates defeated the Federals at Brice's Cross-Roads, Mississippi | 1864 |
| 12. | The British defeat the Boers at Diamond Hill | 1900 |
| 14. | Final defeat of Charles I, at Naseby, by Cromwell | 1645 |
| Battle of Marengo | 1800 |
| Napoleon's decisive overthrow of the Russians at Friedland | 1807 |
| Napoleon's defeat of the Austrians at Raab | 1809 |
| 15. | Siege of Saragossa begun | 1808 |
| 16. | Napoleon's defeat of Blücher at Ligny | 1815 |
| Marshal Ney's indecisive attack on the British at Quatre Bras | 1815 |
| The Federals under Grant attacked the Confederate lines in front of Petersburg, Virginia; fighting continued throughout the remainder of the month | 1864 |
| 17. | The battle of Bunker Hill | 1775 |
| 18. | Frederick the Great's defeat by the Austrians at Kolin | 1757 |
| War declared against England by the United States | 1812 |
| The battle of Waterloo | 1815 |
| Battle between the French under Grouchy and the Prussians at Wavre | 1815 |
| 19. | Sinking of the Alabama by the Kearsarge | 1864 |
| 21. | Encounter between the Leopard and the Chesapeake | 1807 |
| Wellington's decisive victory over the French at Vittoria, in Spain | 1813 |
| 23. | Clive's great victory at Plassey, near Calcutta | 1757 |
| 24. | The Austrians defeated the Italians at Custozza | 1866 |
| First engagement of the Santiago campaign, at Las Guasimas | 1898 |
| The Scots under Robert Bruce defeated the English at Bannockburn | 1314 |
| 25. | Battle of Little Bighorn—The Custer Massacre | 1876 |
| 26. | The Federals under Fitzjohn Porter defeated the Confederates under Longstreet at Mechanicsville, Virginia | 1862 |
| 27. | Peter the Great defeated Charles XII at Pultowa | 1709 |
| George II defeated the French at Dettingen | 1743 |
| Indecisive battle between the Federals under McClellan and the Confederates under Lee at Gaines Mill, Virginia | 1862 |
| The Confederates under Johnston defeated Federals under Sherman at Kenesaw Mountain, Georgia | 1864 |
| 28. | The American sloop Wasp captured the British sloop Reindeer | 1814 |
| Capture of Silistria by the Russians | 1829 |
| Battle of Fort Moultrie, Charleston, South Carolina | 1776 |
| Washington defeated Clinton in the battle of Monmouth | 1778 |