John O'Neill (November 22, 1768 – January 26, 1838) was an American military officer, manufacturer and lighthouse keeper.
[1] In 1809, O'Neill was commissioned ensign of a company of militia in Maryland by Governor Edward Lloyd.
[2] During the War of 1812, O'Neill was the second lieutenant of a company of militia in the 42nd Regiment in Harford County.
He manned the Potato Gun Battery, between Bourbon and Fountain streets in Havre de Grace on May 3, 1813, when the British raided Havre de Grace commanded by Lieutenant George Westphal.
[3] He was held prisoner on the HMS Maidstone and was sentenced to be shot by Admiral George Cockburn.
[2][3] On November 14, 1914, a monument and cannon was dedicated at Concord Point to commemorate O'Neill.