The remaining ships spent most of the rest of the war escorting convoys in the North Atlantic, based in either Canada or the UK. "Ottawa" assisted the British destroyer in sinking the on 7 November 1940. She was sunk by the on 14 September 1942 while escorting Convoy ON 127. "St. Laurent" had her first victory on 27 December 1942 when she was credited with sinking while defending Convoy ON 154. Together with the destroyer , and the frigates and , she sank . While escorting Convoy SC 94 on 3 August 1942, "Assiniboine" rammed and sank . "Restigouche" never sank a submarine, but she and "St. Laurent" were transferred to the UK to protect the shipping mustering for Operation Overlord in May 1944 and "Assiniboine" followed in July. They saw some action against German patrol boats in the Bay of Biscay, but "Restigouche" and "St. Laurent" were in poor shape by this time and were sent back to Canada for lengthy refits in late 1944. They remained in Canada after the completion of their refits in early 1945, while "Assiniboine" remained in the UK until June. All three ships transported Canadian troops home after VE Day until they were decommissioned in late 1945. All three were broken up in 1946–47.