The ships' complement consisted of 85 officers and ratings. The latter guns were in short supply when the esfort ships were being completed and they often got a proportion of single mounts.
All of the ships were fitted for four throwers and two rails for depth charges. Marie, Ontarioobjected.
The ship was renamed Sault Ste. Ltd in Port Arthur, Ontario. Lawrence Rivermaking her way to Halifax, Nova Scotia.
Sault Ste. Marie then proceeded to Bermuda to work up and upon her return, ed the Western Sault escort Force escort group W-9 for convoy escort duties in the Battle of the Atlantic. The minesweeper took the position of Senior Officer Ship upon ing the group. Marie remained a part of escort group W-9 until mid-April when she transferred to group W-7, retaining the position of Senior Officer Ship with the new group.
W-7 was disbanded in Juneafter which the minesweeper was placed in reserve at Sydney, Nova Scotia. A month later on 12 Januarythe minesweeper was paid off into the reserve again. On 7 Maythe ship was recommissioned as a training sault escort.
On 1 October Sault Ste. Marie was paid off. She was taken to Sorel where the ship was broken up in