Commissioned September 13, 1944 at Quebec City, Prestonian arrived at Halifax the following month in need of repairs, and it was early January, 1945, before she could go to Bermuda to work up. On her return to Canada she was assigned to EG 28, based at Halifax, and employed locally until VE-Day. She then underwent tropicalization at Halifax, completing August 20, and on November 9 was paid off and sold to Marine Industries Ltd. Later re-acquired by the RCN, she was rebuilt to become the name-ship of the Prestonian ocean escort class. She was re-commissioned on August 22, 1953, and finally paid off on April 24, 1956, having been lent to the Norwegian navy. Re-named Troll, she was transferred outright in 1959, and in 1965 reclassified as a submarine depot ship and re-named Horten. She was discarded in 1972.
Recommissioned as a Prestonian Class on 22-Aug-53. Pendant Number 307. Finally Paid Off 24-Apr-56.