"Lady Evelyn" was one of a number of Canadian government ships taken over by the Royal Canadian Navy during the First World War. Commissioned in June 1917, she spent her career on the East Coast. The ship's ability as a patrol vessel was limited by her 9-knot maximum speed. However, the ship was still assigned to seaward patrols against German U-boats, even though the ship was not capable of operating in heavy seas. At the time of the December 1917 Halifax Explosion, "Lady Evelyn" was patrolling off the harbour's approaches. On 18 August 1918 "Lady Evelyn" dropped depth charges on a possible submarine contact after spotting a periscope. As attacks on shipping in Canadian waters increased, "Lady Evelyn" was used to escort convoys. Following the war, the ship was decommissioned in 1919.