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With victory in Europe seemingly imminent, the RCN deployed "Longueuil" to Esquimalt in June 1945 in preparation for Operation Downfall, the Allied invasion of Japan. "Longueuil" joined the RCN's Pacific Fleet only weeks before the Surrender of Japan following the atomic bombings of Hiroshima and Nagasaki. She began a tropicalization refit in preparation for her service in the Pacific Ocean, but that was cancelled upon the surrender of Japan. "Longueuil" was paid off from the RCN on 31 December 1946 and the decision was made to dismantle her armaments and scuttle her to form a breakwater in Kelsey Bay, British Columbia in 1947.