24 World War I naval ships of Canada

The P.V. type minesweeping trawlers were seven Royal Canadian Navy minesweeping trawlers built before the First World War in the United States. Initially constructed and used as menhaden trawlers they were taken into service the Royal Canadian Navy during the First World War for patrol duty along the Atlantic coast. Following the war they were returned to their original service.

With the outbreak of war, Great Britain and Canada planned to significantly expand the RCN. Government and commercial vessels were pressed into naval service, vessels were transferred, loaned or purchased from the Royal Navy, and many smaller vessels were constructed in Canada. The List of Royal Canadian Navy ships of the First World War lists the surface warships, submarines and auxiliary vessels in service during the war. It includes all commissioned, non-commissioned, loaned or hired ships. and all ships crewed by RCN personnel under the command of the RCN.

HMCS Arleux was one of twelve Battle-class naval trawlers used by the Royal Canadian Navy (RCN). Entering service in 1918 near the end of the First World War, the vessel had a short career with the RCN, being transferred to the Department of Marine and Fisheries in 1922. Arleux was used for fisheries patrol off the east coast of Canada until 1939, when the ship was reacquired by the RCN at the onset of the Second World War. Used as a gate vessel during the war and designated Gate Vessel 16, the ship was sold for mercantile purposes following the war. The ship foundered in 1948 off the coast of Nova Scotia.

HMCS Armentières was one of twelve Battle-class naval trawlers used by the Royal Canadian Navy (RCN). Armentières entered service in 1918 near the end of the First World War on the Atlantic coast of Canada. Following the war, the ship was transferred to the Department of Marine and Fisheries for a short period before reverting to RCN service in 1923 on the Pacific coast of Canada. The ship sank in 1925, was raised and re-entered service, remaining with the fleet through the Second World War as an examination vessel at Prince Rupert, British Columbia. After the end of the war, the vessel entered mercantile service becoming A.G. Garrish in 1947, later renamed Arctic Rover in 1958, Laforce in 1962 and Polaris in 1973. The ship's registry was deleted in 1991.

HMCS Arras was one of twelve Battle-class naval trawlers that saw service with the Royal Canadian Navy (RCN). The vessel entered service in 1918 near the end of the First World War and was used for patrolling and escort duties along the Atlantic Coast of Canada. Following the war, Arras was transferred to the Department of Marine and Fisheries where the ship was used as a fisheries patrol vessel. Following the outbreak of the Second World War, the ship re-entered RCN service as a gate vessel. In 1943, the ship was heavily damaged by fire and was broken up in 1957.

CGS Canada was a patrol vessel, sometimes referred to as a cruiser, in the Fisheries Protection Service of Canada, an enforcement agency that was part of the Department of Marine and Fisheries. Canada is considered to be the nucleus of the Royal Canadian Navy for her role in training Canadian naval officers and asserting Canadian sovereignty. Canada saw service in the First World War and was commissioned into the Royal Canadian Navy as HMCS Canada during that conflict. Following the war, the vessel was sold for commercial use and renamed MV Queen of Nassau. On the verge of being sold again, the ship sank in Straits of Florida on 2 July 1926.

HMCS Constance was a commissioned minesweeper of the Royal Canadian Navy (RCN) during the First World War. Originally built as a fisheries cruiser for the Department of Marine and Fisheries, upon completion she was transferred to the Department of Customs, and was used by the Customs Preventive Service. Constance spent the entire war as a patrol and examination vessel on the East Coast of Canada. Following the war, the vessel was sold in 1924.

HMCS Curlew was a commissioned minesweeper and patrol vessel of the Royal Canadian Navy (RCN) that served in the First World War. Constructed in Ontario in 1892, Curlew was initially a Canadian government fisheries patrol vessel on the East Coast of Canada. In 1912, the ship was fitted as a minesweeper and in 1914, joined the RCN. Curlew spent the entire war on the East Coast of Canada. Following the war, the ship was taken out of service and sold in 1921.

HMCS Festubert was one of twelve Battle-class naval trawlers constructed for and used by the Royal Canadian Navy (RCN) during the First World War. Following the war, Festubert remained in Canadian service as a training ship until 1934. Reactivated for the Second World War, the ship was used as a gate vessel in the defence of Halifax, Nova Scotia and re-designated Gate Vessel 17. Following the war, the trawler was sold for commercial use and renamed Inverleigh. Inverleigh was scuttled off Burgeo, Newfoundland on 30 June 1971.

HMCS Givenchy was one of twelve Battle-class naval trawlers constructed for and used by the Royal Canadian Navy (RCN) during the First World War on the east coast. Following the war, the ship was transferred to the Department of Marine and Fisheries for use as a fisheries patrol vessel on the west coast. Givenchy reentered service with the RCN in 1939 as an accommodation ship during the Second World War and was recommissioned from 1940 to 1943. After the war the ship was sold and broken up in the United States in 1952.

HMCS Gulnare was a Canadian government ship that served as a patrol boat and guard vessel for the Royal Canadian Navy (RCN) during the First World War. Acquired by the Canadian government in 1902, Gulnare was used for fisheries patrol and hydrographic survey duties until 1914. Following the war, Gulnare was used to intercept smugglers. Returned to government service in 1920, the vessel was converted to a lightship in 1925 and sold in 1937 to private interests. The vessel was broken up for scrap in the late 1940s.

HMCS Lady Evelyn was a commissioned patrol boat of the Royal Canadian Navy during the First World War. Originally built as a passenger liner, Deerhound, she was acquired in 1907 by the Canadian government and renamed Lady Evelyn for use by the post office. After the war, she was sold for civilian service and scrapped in 1936.

HMCS Laurentian was a commissioned patrol vessel of the Royal Canadian Navy that served in the First World War and postwar until 1919. Prior to Canadian naval service, the ship was used by the Canada Customs Preventative Service. Following the war, Laurentian was transferred to the Department of Marine and Fisheries and used as a buoy tender and lighthouse supply vessel until taken out of service in 1946 and broken up for scrap in 1947.

HMCS Loos was one of twelve Battle-class naval trawlers used by the Royal Canadian Navy (RCN). Built by the Kingston Shipbuilding Company and launched in September 1917, she was commissioned in August 1918. Decommissioned in 1920, Loos was transferred to the Department of Marine and Fisheries, where she was used as a lighthouse supply ship. Sold in 1937, she was re-acquired by the RCN in December 1940 and converted to a gate vessel, spending part of the war at Shelburne, Nova Scotia. Returned to Marine Industries Limited in 1945, Loos was broken up in 1949.

CGS Margaret was the first vessel to be built specifically for the Canadian Customs Preventive Service. Delivered in 1914, she was transferred to the Royal Canadian Navy and served as HMCS Margaret during the First World War. Following the war, Margaret was returned to the Customs Preventive Service spending most of the 1920s intercepting smugglers during American Prohibition. In 1932 the ship was transferred to the Royal Canadian Mounted Police. The ship was sold shortly thereafter, and was subsequently acquired by the Brazilian Navy and renamed Rio Branco, utilized as a hydrographic survey vessel. Rio Branco was discarded in 1958.

HMCS Messines was one of twelve Battle-class naval trawlers constructed for and used by the Royal Canadian Navy (RCN) during the First World War. Following the war the ship was transferred to the Canadian Department of Marine and Fisheries and converted into a lightvessel. Re-designated Lightship No. 3, the vessel was sold for scrap and broken up in 1962.

HMS Patrician was a Thornycroft M-class destroyer that served in the British Royal Navy during World War I. The destroyer entered service in 1916 and served with the Grand Fleet. Following the war, the destroyer was deemed surplus and she was transferred to the Royal Canadian Navy in 1920 and served there until 1928. She was sold for scrap in 1929.

HMS Patriot was a Thornycroft M-class destroyer that served in the British Royal Navy. The destroyer entered service in 1915 during the First World War and saw service with the Grand Fleet. Following the war, the destroyer was declared surplus and in 1920, the ship was transferred to the Royal Canadian Navy. Recommissioned as HMCS Patriot, the destroyer was used primarily as a training ship. Patriot was taken out of service in 1927, sold for scrap in 1929 and broken up.

HMCS St. Eloi was one of twelve Battle-class naval trawlers constructed for and used by the Royal Canadian Navy (RCN) during the First World War. Following the war the ship was transferred to the Canadian Department of Marine and Fisheries and converted into a lightvessel. Re-designated Lightship No. 20, the vessel returned to RCN service in 1940 to become the gate vessel Gate Vessel 12 during the Second World War. After the war, the trawler returned to government service and was discarded in 1962.

HMCS St Julien was one of twelve Battle-class naval trawlers constructed for and used by the Royal Canadian Navy (RCN) during the First World War. Following the war the ship was transferred to the Canadian Department of Marine and Fisheries and converted into a lightvessel. Re-designated Lightship No. 22, the ship remained as such until 1958. The ship was sold for commercial use and renamed Centennial and was in service until 1978.

HMCS Thiepval was one of twelve Battle-class naval trawlers used by the Royal Canadian Navy (RCN). After seeing service on Canada's east coast at the end of the First World War, Thiepval was transferred to the west coast, where she spent the remainder of her career. In 1924, Thiepval visited the Soviet Union and Japan as part of the support efforts for a round-the-world flight attempt. Thiepval struck a rock and sank off the British Columbia coast in 1930, and her wreck has since become a popular attraction for divers.

HMCS Tuna was a commissioned torpedo boat of the Royal Canadian Navy (RCN) that served during the First World War. Built as the high-speed civilian yacht Tarantula, the vessel was one of several converted yachts the RCN used during the war. Following the war, the ship was discarded and stripped.

HMCS Vimy was one of twelve Battle-class naval trawlers constructed for and used by the Royal Canadian Navy (RCN) during the First World War. Following the war the ship was transferred to the Canadian Department of Marine and Fisheries and converted into a lightvessel. Re-designated Lightship No. 5, the vessel remained in Canadian government service until being possibly broken up for scrap in 1958.

HMCS Ypres was one of twelve Battle-class naval trawlers constructed for and used by the Royal Canadian Navy (RCN) during the First World War. Named after the Second and Third battles of Ypres, the ship entered service in 1918, patrolling the east coast of Canada for submarine activity. Following the war, the ship remained in service with as a patrol and training ship. In 1938, the vessel recommissioned as a gate vessel, re-designated Gate Vessel 1, in service at Halifax, Nova Scotia. On 12 May 1940, the gate vessel was rammed and sunk in a collision with the British battleship HMS Revenge.