- Sep 1 Britain signs treaty with Nizam of Hyderabad, India
- Sep 2 First bank robbery in the US: Bank of Pennsylvania robbed of $162,821 at Carpenter's Hall, Philadelphia
- Sep 3 Battle of St. George's Caye: Week long battle begins between the Spanish Empire and Great Britain off the coast of Belize
- Sep 5 New conscription law goes into effect in France
- Sep 10 British Honduras beats Spain in battle of St George