Commissioned at Vancouver on January 23, 1941, Agassiz arrived at Halifax on April 13 and left on May 23 for St. John's to join the newly formed NEF. She sailed early in June with a convoy for Iceland and was thereafter in continuous service as an ocean escort until the end of 1943. In September, 1941, she took part in a major battle around convoy SC.44, rescuing survivors of her torpedoed sister, HMCS LÚvis. She was also part of the escort of the hard-pressed convoy ON.115 in July, 1942. On January 5, 1943, she commenced a major refit at Liverpool, N.S., completing in mid-March, and in April was assigned to newly designated EG-C-1. She arrived at New York on December 16 for another major refit, including extension of her fo'c's'le, completing March 4, 1944. After working up in St. Margaret's Bay in April, she joined EG W-2 of WEF, transferring in August to W-7. She spend the remainder of the war with W-7, being paid off on June 14, 1945, at Sydney, and was broken up in 1946.
Focsle Extended, New York, NY, 4 Mar 44