Griffin did not see any action during the Japanese Indian Ocean raid in April, but was escorting convoys for most of her time in the Indian Ocean. In June, the ship returned to the Mediterranean to escort another convoy to Malta in Operation Vigorous. Beginning in November 1942, she was converted to an escort destroyer in the United Kingdom and was transferred to the Royal Canadian Navy on 1 March 1943. The ship, now renamed HMCS Ottawa, was assigned to escort convoys in the North Atlantic until she was transferred in May 1944 to protect the forces involved with the Normandy Landings. Working with other destroyers, Ottawa sank three German submarines off the French coast before she returned to Canada for a lengthy refit. After the end of the European war in May 1945 the ship was used to br