Castle-class trawler

HMT Edward Gallagher as HMT Cardiff Castle during World War II
Class overview
Name	Castle class
Operators	Royal Navy  Royal Canadian Navy  Royal New Zealand Navy  Kriegsmarine
Completed	about 280
General characteristics (standard ships)[1][2]
Type	Minesweeper/naval trawler
Tonnage	285 GRT
Displacement	360 tons standard 547 tons fully loaded
Length	134 ft (41 m) LOA 125.5 ft (38.3 m)
Beam	23.5 ft (7.2 m)
Draught	12.7 ft (3.9 m)
Propulsion	1 vertical triple expansion reciprocating engine, 1 boiler, 1 shaft, 480 ihp (360 kW)
Speed	10.5 knots (19.4 km/h; 12.1 mph)
Complement	15, up to 18 with wireless
Armament	Most armed with 76 mm (3 in) 12-pounder gun George Harris, Thomas Bartlett, John Bomkworth 57 mm 6-pounder gun Giovonni Guinti QF 4 in (102 mm) naval gun

The Castle-class minesweeper was a highly seaworthy naval trawler adapted for patrol, anti-submarine warfare and minesweeping duties and built to Admiralty specifications. Altogether 197 were built in the United Kingdom between 1916 and 1919, with others built in Canada, India and later New Zealand. Many saw service in the Second World War.