History
Canada
Name	Trois Rivières
Namesake	Trois Rivières, Quebec
Builder	Marine Industries Ltd. Sorel
Laid down	9 December 1940
Launched	30 June 1941
Commissioned	12 August 1942
Decommissioned	31 July 1945
Identification	Pennant number: J269
Honours and awards	Atlantic 1942-44,[1] Gulf of St. Lawrence,[2] 1944
Fate	Scrapped, 1960
General characteristics
Class and type	Bangor-class minesweeper
Displacement	592 long tons (601 t)
Length	162 ft (49.4 m)
Beam	28 ft (8.5 m)
Draught	8.25 ft (2.51 m)
Propulsion	2 shafts, 9-cylinder diesel, 2,000 bhp (1,500 kW)
Speed	16 knots (30 km/h)
Complement	83
Armament	1 × QF 12-pounder 12 cwt naval gun 1 × QF 2-pounder Mark VIII 2 × QF 20 mm Oerlikon guns 40 depth charges as escort

HMCS Trois Rivières (pennant J269), alternatively spelled Trois-Rivieres and Trois-Rivières, was a Bangor-class minesweeper that served with the Royal Canadian Navy during the Second World War. The ship entered service in 1942 and served as a patrol and convoy escort vessel in the Battle of the Atlantic. Following the war, the minesweeper was transferred to the Royal Canadian Mounted Police and renamed MacBrien. The vessel was sold for scrap and broken up in 1960.

The Bangor class was initially to be a scaled down minesweeper design of the Halcyon class in Royal Navy service.^[3][4] However, due to the difficulty procuring diesel engines led to the small number of the diesel version being completed.^[4] The ships displaced 592 long tons (601 t) standard and 690 long tons (700 t) fully loaded. They were 162 feet (49.4 m) long with a beam of 28 feet (8.5 m) and a draught of 8 feet 3 inches (2.51 m).^[4][5] However, the size of the ship led to criticisms of their being too cramped for magnetic or acoustic minesweeping gear.^[4] This may have been due to all the additions made during the war with the installation of ASDIC, radar and depth charges.^[3]

The Bangor class came in two versions. Trois Rivières was of the diesel-powered version, being equipped with a 9-cylinder diesel engine driving two shafts that produced 2,000 brake horsepower (1,500 kW). This gave the ship a maximum speed of 16.5 knots (30.6 km/h). The vessels carried 65 long tons (66 t) of oil.^[4] The vessels had a complement of 6 officers and 77 ratings.^[5]

The Canadian diesel-powered Bangors were armed with a single quick-firing (QF) 12-pounder 12 cwt gun mounted forward.^[4][5][a] The ships were also fitted with a QF 2-pounder Mark VIII gun aft and were eventually fitted with single-mounted QF 20 mm Oerlikon guns on the bridge wings.^[6] For those ships assigned to convoy duty, they were armed with two depth charge launchers and two chutes for the 40 depth charges they carried.^[4][6]

The minesweeper was ordered as part of the 1940–1941 construction programme.^[6] The ship's keel was laid down on 9 December 1940 by Marine Industries at their yard in Sorel, Quebec. Named for a community in Quebec, Trois Rivières was launched on 30 June 1941. The ship was commissioned on 12 August 1942 at Sorel.^[7]

The minesweeper was assigned to the Western Local Escort Force after arriving at Halifax, Nova Scotia in August 1942. Trois Rivières transferred to Newfoundland Force, the patrol and escort force operating from St. John's, Newfoundland, in November 1942. Beginning in October 1943, Trois Rivières began a refit at Dalhousie, New Brunswick, that in different stages, took the ship to Halifax and Saint John, New Brunswick before completing in January 1944. Following the refit the ship returned to Newfoundland Force. In February 1945, the minesweeper underwent another refit, this time at Lunenburg, Nova Scotia, which lasted until May. The ship returned to Newfoundland Force and remained with the group until its disbandment in June.^[7]

Trois Rivières was paid off on 31 July 1945 and turned over to the Royal Canadian Mounted Police (RCMP) on 3 August 1945.^[7][8] Renamed MacBrien by the RCMP, the ship served on the East Coast of Canada until transferred on permanent loan for conversion to a naval research vessel. However, the conversion was not completed and MacBrien was declared surplus on 13 June 1959.^[8] The vessel was sold for scrap and broken up in 1960.^[9][10]

• Brown, D.K. (2000). Nelson to Vanguard: Warship Design and Development 1923–1945. Chatham Publishing. ISBN 1861761368.
• Chesneau, Roger, ed. (1980). Conway's All the World's Fighting Ships 1922–1946. Greenwich, UK: Conway Maritime Press. ISBN 0-85177-146-7.
• Colledge, J. J.; Warlow, Ben (2006) [1969]. Ships of the Royal Navy: The Complete Record of all Fighting Ships of the Royal Navy (Rev. ed.). London: Chatham Publishing. ISBN 978-1-86176-281-8.
• Haycock, John (2011). Vassilopoulos, Peter (ed.). The History of the RCMP Marine Services. Ottawa: Queen's Printer. ISBN 978-0-919317-47-5.
• Macpherson, Ken (1997). Minesweepers of the Royal Canadian Navy 1938–1945. St. Catharines, Ontario: Vanwell Publishing Limited. ISBN 0-920277-55-1.
• Macpherson, Ken; Barrie, Ron (2002). The Ships of Canada's Naval Forces 1910–2002 (Third ed.). St. Catharines, Ontario: Vanwell Publishing. ISBN 1-55125-072-1.

• "Bangor Class". Canadian Navy of Yesterday and Today. Hazegray.org.