High Quality Content by WIKIPEDIA articles! HMS Glatton was a 56-gun fourth rate of the Royal Navy. She was launched as the Glatton, an East Indiaman, on 29 November 1792 by Wells Co. of Blackwell. The Royal Navy bought her in 1795 and converted her into a warship. Glatton was unusual in that for a time she was the only ship-of-the-line the Royal Navy armed exclusively with carronades. (Eventually she returned to a more conventional armament.) She served in the North Sea and the Baltic, and then as a transport for convicts to Australia. She then returned to naval service in the Mediterranean. After the end of the Napoleonic Wars the Admiralty converted her to a water depot at Sheerness. In 1830 the Admiralty converted Glatton to a breakwater and sank her at Harwich.