Little is known of this vessel except that she was built in Philadelphia, presumably circa 1775 - around the time of the start of the American War of Independence - and was captured by the British sloop Beaver off St. Lucia on 19th May 1777. Assimilated into the Royal Navy as H.M.S. Convert, she was estimated by the Admiralty's surveyors at 248 tons and measured 86 feet in length with a 26 foot beam. Initially classed as a sixth rate mounting 24 guns, she was sent home to England in 1778 where she was reclassed as a sloop of 263 tons, renamed Beaver's Prize and armed with 16-6pdrs. Returning to the Caribbean where much of the naval activity of the American War was taking place, she was one of six vessels of the fleet lost in the aptly named 'Great Hurricane' which devastated the West Indies, particularly the Windward Islands, St. Lucia and Barbados, with great force on 11th October 1780. Beaver's Prize herself was on passage from St. Lucia to Barbados when the hurricane struck and, caught in the eye of the storm, she was driven ashore near the Vieux Fort on St. Lucia with the loss of all but 17 of her crew of 110, including her captain Commander John Drummond.