According to Wikipedia:
"After refitting at Halifax in 1941, St. Laurent escorted convoy ON 119 with Escort Group C-2 and then convoys ON 133, HX 211, SC 110, ONS 154, HX 222, ONS 2, SC 127 and ON 184 as part of Escort Group C-1.[1] St. Laurent had her first victory on 27 December 1942 when she was credited with sinking U-356 while escorting Convoy ON 154 north of the Azores, along with the corvettes HMCS Chilliwack (K131), HMCS Battleford (K165) and HMCS Napanee (K118).
On 10 March 1944, St. Laurent was credited with sinking U-845 in the North Atlantic, along with the destroyer HMS Forester, corvette HMCS Owen Sound (K340) and corvette HMCS Swansea (K328).
On june 6, 1944 St. Laurent was Present during the Normandy Landings. The role the St. Laurent played in this battle is unknown at this time.
St. Laurent was decommissioned on 10 October 1945."
Source: http://en.wikipedia.org/wiki/HMCS_St._Laurent_%28H83%29