HMS Loyalty was an Algerine-class minesweeper of the Royal Navy, originally launched as HMS Rattler. She was a turbine-powered vessel built for mine clearance and service during World War II. The ship measured 225 feet (68.6 meters) in length with a beam of 35 feet 6 inches (10.8 meters) and a draught of 11 feet (3.4 meters). Displacing approximately 850 long tons (860 tons) at standard load and up to 1,125 long tons (1,143 tons) at deep load, Loyalty was powered by two Parsons geared steam turbines, each driving a shaft, fueled by two Admiralty three-drum boilers. These turbines produced a total of 2,000 shaft horsepower, enabling the vessel to reach a maximum speed of 16.5 knots (30.6 km/h). She carried a fuel capacity of 660 long tons (671 tons), providing a range of 5,000 nautical miles at 10 knots. Armament on Loyalty included a QF 4-inch (102 mm) Mk V anti-aircraft gun and four twin-gun mounts for Oerlikon 20 mm cannons, although shortages meant some ships carried single mounts. She was also fitted with four throwers and two rails for depth charges, supporting anti-submarine operations. Commissioned in 1943, Loyalty was initially part of the 18th Minesweeping Flotilla, operating in Lyme Bay and the English Channel, before transferring to the North Sea and later to Dover. She participated in Operation Starkey, an attempt to engage German aircraft, and was involved in minesweeping operations off Normandy during the D-Day landings in June 1944. Loyalty supported the Allied invasion, clearing channels and guarding the beaches throughout June and July. Tragically, on 22 August 1944, while returning to Portsmouth after operations off Normandy, Loyalty was torpedoed by the German U-boat U-480 in the English Channel. She capsized in less than seven minutes, resulting in the loss of her captain and 18 ratings. Only 30 crew members survived. The wreck is designated as a protected site under the Protection of Military Remains Act 1986. Loyalty's service exemplifies the vital role of minesweepers in ensuring Allied naval and amphibious operations during WWII.

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