She was named for a French martyr of 1690 in lieu of tile name Pointe-aux-Trembles, Que., the latter being considered overly long. Commissioned at Montreal on December 4, 1943, she arrived at Halifax later that month, worked up in St. Margaret's Bay and in March, 1944, was assigned to EG 6, Londonderry. In April she went to Kola Inlet and returned as escort to convoy RA.59 from North Russia. Based at various times at Londonderry, Portsmouth, and Plymouth, she was present on D-Day on A/S patrol. Grou left for home with convoy ON.285 on February 17, 1945, and on March 4 began a six-month tropicalization refit at Dartmouth, N.S. In October she left for the west coast, where she was paid off into reserve at Esquimalt on February 25, 1946. She was broken up at Victoria in 1948.