HMCS Amherst

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 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]

After her commissioning Amherst was sent on convoy escort duty from 22 August 1941 until her first refit in 1943.[14] The ship was assigned to Newfoundland Force[14] and on 11 October 1941, the escort for convoy SC 49 was taken over by the Canadian escort group 4.1.16, of which Amherst was a member. During their escort, the convoy was rerouted to the north of convoy SC 48 and their ongoing battle. On 22 October, escort of the convoy was handed over to the British escort group EG 4 at the Mid-Ocean Meeting Point (MOMP).[15] On 6 November, Amherst's escort group took over the escort of convoy ONS 32 at the MOMP, first rerouting to the south to avoid the German U-boats before arriving without incident. This was followed by four more uneventful convoy escort missions, SC 56, ONS 44, SC 63 and ONS 58 taking the ship into 1942.[16]

In August 1942, Amherst was made a member of the Mid-Ocean Escort Force (MOEF) escort group C-4. The unit was escorting convoy ON 127 when it is sighted by a U-boat on 9 September. The wolfpack "Vorwärts" moved to intercept and engaged the convoy on 10 September. Hampered by faulty radar, the escort is overwhelmed, losing the destroyer HMCS Ottawa during the battle. The battle lasts until 14 September, out of the 32 freighters in the convoy, 10 were sunk, plus a trawler that was near the convoy, comprising 79,263 gross register tons (GRT).[17] During the battle, Amherst was fired upon by the German submarine U-92 but all of the torpedoes missed while recovering the survivors of SS Hindanger.[18] Amherst and sister ship Sherbrooke detached from the convoy on 15 September, escorting four merchant vessels that had been damaged in the battle to St. John's, Newfoundland.[19] Amherst and C-4 then escorted convoy SC 101 at the end of the month, losing only one ship that had straggled behind the main body of the convoy to the U-boats.[20]

On 16 October 1942, C-4 was escorting convoy ON 137 which was spotted by German forces. However, the convoy evaded the wolfpacks "Panther" and "Wotan" without loss.[21] At the end of October, C-4 was deployed on escort duty, this time with convoy SC 107, consisting of 42 ships.[22] However, Amherst had recently had a change in command, and two of the group were only on passage to the United Kingdom. First contact between the opposing forces took place on 30 October, but was lost until 2 November. The wolfpack "Velichen" was placed across SC 107's path.[23] Amherst engaged several U-boats. During his first encounter the commanding officer, Lieutenant Louis Audette, went up to the crowsnest to direct fire down on the surfaced U-boat. The next night during her attempt to sink another submarine her ASDIC lost power and she lost contact. During the same convoy, a member of the crew earned a British Empire Medal for helping save three stranded crew from a burning vessel.[24] However, the convoy lost 15 ships, comprising 82,777 GRT.[22]

In January 1943, C-4 was deployed to escort convoy HX 224, which was discovered by Axis forces on 1 February. The convoy was attacked and three merchant ships were sunk comprising 24,823 GRT.[25] Later that month C-4 was sent to Londonderry for training, before sailing on 2 March to escort eight troopships sailing as convoy KMF 10B to Algiers. They passed through the Strait of Gibraltar uneventfully, but came under attack by German Focke-Wulf Fw 200 Condor aircraft, damaging one of the troopships. The rest of the convoy was uneventful, arriving at Algiers on 17 March.[26] C-4 sailed for the United Kingdom escorting the return convoy MKF 10B uneventfully. In early April C-4 escorted convoy ON 177, making the trip safely, after being rerouted to avoid German wolfpacks.[27] Amherst was reassigned to MOEF group C2 and the unit escorted ON 149 in late April. Though the German forces made contact during the transit, the convoy arrived safely.[28]

Amherst underwent a major refit at Charlottetown, Prince Edward Island, getting her forecastle extended among other changes to the ship from May to November 1943. After more workups at Pictou, Nova Scotia the corvette returned to convoy escort duty in the Atlantic until her second refit in September 1944. After work was completed Amherst was worked up in Bermuda. Amherst was assigned to Halifax Force in January 1945, tasked with local defence. In March the corvette joined the escort group C-7 for one more round trip to the United Kingdom before the end of the war in the Atlantic.[14] Amherst was awarded the battle honours "Atlantic 1941–45"[29] and "Gulf of St. Lawrence 1944"[30] for service during the Second World War.

Amherst was paid off from service on 11 July 1945 at Sydney, Nova Scotia. The corvette was then placed in reserve at Sorel, Quebec. The ship was one of seven corvettes disposed of by sale on 17 October to the Venezuelan Navy and was renamed Carobobo. However, while departing Canadian waters for Venezuela, the ship was wrecked in the Gulf of St. Lawrence.[14][31][lower-alpha 1]