HMS Adamant was a 50-gun Portland-class fourth-rate ship of the line of the Royal Navy, constructed during the American War of Independence. Built to a 1767 design by John Williams, she was ordered from Peter Baker of Liverpool on 13 November 1776, laid down on 6 September 1777, and launched on 24 January 1780. Her construction cost approximately £16,314, rising to about £27,497 with fitting out. The vessel was completed between 13 June and 12 August 1780 at Plymouth. Physically, Adamant was a two-decker ship armed with 50 guns, characteristic of the Portland-class design. She initially served in North American waters, participating in key battles such as the Battle of Cape Henry (March 1781) and the Battle of the Chesapeake (September 1781). After her return to Britain in December 1782, she was refitted and then served as the flagship of Admiral Sir Richard Hughes in the Leeward Islands for three years, from 1783 to 1786. Following a major repair, she was fitted as a flagship at Sheerness (1787–1789) and subsequently operated in Nova Scotia under Captain David Knox. With the outbreak of the French Revolutionary Wars, Adamant was quickly recommissioned and served extensively in the Caribbean and North Sea. She participated in the blockade of the Dutch fleet at the Nore during the mutiny in 1797, where she was one of only two ships to remain loyal, and was instrumental in the Battle of Camperdown later that year, achieving a decisive British victory. Her operations included capturing privateers, recapturing vessels, and engaging French commerce raiders, notably forcing the French frigate Preneuse ashore and capturing her after a fierce engagement off Île de France in December 1799. Throughout her career, Adamant also spent time in the Indian Ocean, where she recaptured ships and took part in actions against French privateers. She continued to serve actively, escorting convoys and capturing enemy vessels, before eventually becoming a receiving ship and flagship at Leith during the Napoleonic Wars. Her service concluded with her being laid up in ordinary and subsequently broken up in June 1814, marking a distinguished thirty-year career of active service in major naval conflicts of her era.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.