| July 31st 1803 | - Birth: | John Ericsson, US, inventor (screw propeller)/shipbuilder-USS Monitor |
| July 31st 1767 | - Birth: | Amelie Julia Candielle, composer |
| July 31st 1808 | - Birth: | Frederick Nichols Crouch, composer |
| July 31st 1816 | - Birth: | George Henry Thomas, Major General (Union Army), died in 1870 |
| July 31st 1984 | - Event: | Venz commandos terminate hijacking of an aircraft, 2 killed |
| July 31st 1917 | - Event: | 3rd battle of Ypres begins |
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