Commissioned at Montreal on October 31, 1940, Trillium arrived at Halifax on November 14 and in the Clyde on December 20 for final fitting out at Greenock, which was completed on March 3, 1941. In April, after three weeks' workups at Tobermory, she joined EG 4 (RN), Greenock, for outbound North American convoys. She left Aultbea on June 10 with OB.332 for St. John's to join Newfoundland Command. After two round trips to Iceland she arrived at Halifax on August 28 for three months' refit there and at Lunenburg. On completion of the refit in December she made one further round trip to Iceland and, on January 20, 1942, left St. John's for convoy SC.65 to Londonderry. After two return trips on the "Newfie-Derry" run she went to Galveston, Texas, for refit from April 16 to June 23. Following workups at Pictou, she resumed mid-ocean service with EG A-3 from August, 1942 until April, 1943, when she arrived at Boston for a refit that included the extension of her fo'c's'le. This was completed on June 10, after which she worked up at Pictou before joining EG C-4. Late in April, 1944 she returned to Pictou for a two-month refit, followed by additional repairs at Halifax, and early in August went to Bermuda to work up. She arrived at St. John's September 2, 1944, to join EG C-3. On January 14, 1945, while escorting the Milford Haven section of ON.278, she sank a coaster in collision and required five weeks' repairs, afterward resuming mid-ocean service until the end of the war. This ship was unique in that she spent her entire career as a mid-ocean escort, participating in three major convoy battles: SC.100 (September, 1942); ON.166 (February, 1943); and SC.121 (March, 1943). She left St. John's on May 27, 1945, for the U.K., where she was returned to the RN at Milford Haven on June 27. Sold in 1947 for conversion to a whale-catcher, she entered service in 1950 as the Honduran-registered Olympic Runner, and in 1956 became the Japanese Otori Maru No. 10. She last appeared in Lloyd's list for 1959-60.
Focsle Extended, Boston, Mass, 10 Jun 43