TG 120.1, later redesignated Escort Group 32, subsequently performed anti-submarine hunter-killer group and support unit duties for convoys in the western approaches to the United Kingdom. During the closing weeks of the European war, "William T. Powell" patrolled shallow water approaches, sank floating and drifting mines, and supported the escorts for 12 convoys in submarine-infested waters. She based on Derry, Northern Ireland, from 5 April to 23 May, through the cessation of hostilities with Germany and, after that enemy's capitulation, helped to accept the surrender of German U-boats.