June 20, 1813
June 20, 1813 near Hampton Roads, Virginia (USS Constellation vs. HMS Barossa & HMS Junon) - On June 20, the USS Constellation launched 15 boats to attack the HMS Junon, HMS Baroosa, and a British razee. A razee was a ship whose upper deck had been cut away. The British ships were becalmed in the Hampton Roads area, about 3 miles away from the other blockading ships. The Hampton roads would later become famous during the American Civil War, when the Moniter vs. Merimac naval battle occured. At dawn, the American boats opened a sharp fire and seemed for a time about to overpower the Barossa, but the wind shifted and took their advantage away. This attack probably convinced the British commanders that they must try to capture Norfolk, the center of American maritime resistance in the Chesapeake area.
Conclusion: Inconclusive. - See more at: http://www.mywarof1812.com/battles/1812-1815-naval.html#130620