HMCS Algoma

In Canadian service the vessels were altered due to experience with the design's deficiencies. The galley was moved further back in the ship and the mess and sleeping quarters combined. A wireless direction finding set was installed, and enlarged bilge keels were installed to reduce rolling.[10] After the first 35–40 corvettes had been constructed, the foremast was shifted aft of the bridge and the mainmast was eliminated. Corvettes were first fitted with basic SW-1 and SW-2 CQ surface warning radar, notable for their fishbone-like antenna and reputation for failure in poor weather or in the dark. The compass house was moved further aft and the open-type bridge was situated in front of it. The ASDIC hut was moved in front and to a lower position on the bridge. The improved Type 271 radar was placed aft, with some units receiving Type 291 radar for air search. The minesweeping gear, a feature of the first 54 corvettes, was removed.[11] Most Canadian Flower-class corvettes had their forecastles extended which improved crew accommodation and seakeeping. Furthermore, the sheer and flare of the bow was increased, which led to an enlarged bridge. This allowed for the installation of Oerlikon 20 mm (0.8 in) cannon, replacing the Browning and Vickers machine guns.[12] Some of the corvettes were rearmed with Hedgehog anti-submarine mortars.[13] The complements of the ships grew throughout the war rising from the initial 47 to as many as 104.[12]

Algoma was ordered 1 February 1940[14] as part of the 1939–1940 Flower class building program. She was laid down on 18 June 1940 by Port Arthur Shipbuilding Co. in Port Arthur, Ontario, and launched on 17 December 1940. The vessel was commissioned on 11 July 1941 in Montreal, Quebec, and arrived in Halifax, Nova Scotia, on 18 July 1940 to begin her career.[15] In the Battle of the Atlantic, escort ships for convoys of merchant ships were organised into groups, with Algoma initially joining the groups 4.1.12 and 4.1.14 before reorganisation into Mid-Ocean Escort Force (MOEF) Escort Group A3 (EG A3).[16] On 21 February 1942, the convoy ON 67 was located by German U-boats which was being escorted by the convoy escort group A6, of which Algoma was a member of at the time. In the battle from 21–24 February eight ships were sunk.[17] On 11 May, the convoy ONS 92, escorted by A3 was spotted by U-boats. The convoy lost six merchant vessels before contact was lost due to bad weather.[18] Algoma then went in for refit at Liverpool, Nova Scotia in July, which took six weeks to complete. Upon returning to active service, the corvette joined the Western Local Escort Force. She was then assigned to Operation Torch duties in October and left for the United Kingdom with convoy SC 107.[15] On 1 November the convoy was intercepted by the German wolfpack "Hecht" and until the end of the battle on 6 November, 13 merchant ships were sunk.[19]

Algoma was then placed under command of the Royal Navy, escorting convoys to the Mediterranean Sea. In February 1943, the ship was based at Bône, Algeria before returning to Atlantic waters, based at St. John's, Newfoundland. The convoy escorted by Algoma on the return journey, ON 179, suffered no losses even though it was pursued by U-boats.[20] After a brief stint with the Western Support force in May 1943 and a return to WLEF, the corvette joined Quebec Force in June, the unit dedicated to escort and patrol around Quebec until November. Algoma did one quick tour with MOEF group C4 before arriving at Liverpool, Nova Scotia, for a major refit. Algoma returned to service in May 1944, joining MOEF group C5. She performed three round-trips with convoys before joining EG 41 at Plymouth, United Kingdom, under the command of the Royal Navy's Plymouth Command. She spent the rest of the war patrolling the English Channel.[15] For service in the war, Algoma was given the battle honours "Atlantic 1941–44" and "English Channel 1945".[21]

ARV Constitución in 1948

Algoma was paid off on 6 July 1945 at Sydney, Nova Scotia, for disposal. The Venezuelan Navy bought her in 1945 and renamed her ARV Constitución. She was discarded in 1962.[15]