Home Fleet again on 19 May. During the next 2½ months, Emmons joined in patrolling northern waters, guarding the movement of convoys across the North Atlantic, unceasingly alerted against the possible sortie of German ships from Norwegian bases. She also guarded British carriers in air attacks on Norway in July. Returning to Norfolk 9 August 1943, she voyaged to Gibraltar between 3 November and 19 December in the advance scouting line guarding the battleship , carrying President Franklin D. Roosevelt to the Teheran Conference. 1943-1944, Atlantic and Mediterranean Between December 1943 and April 1944, Emmons guarded carriers during their operations at Newport and in Casco Bay, aiding in the training of aviators. On 20 April she sailed from Maine waters for the Azores, and Mers-el-Kebir, Algeria, arriving 1 May for antisubmarine patrols. On 17 May, her group teamed with British aircraft to sink the , and the next day, Emmons sailed for England, and final preparations for the invasion of France, 6 June. After guarding pre-assault minesweeping, she joined in the heavy bombardment prior to the landing. Emmons and other destroyers engaged in combat, less than a thousand yards, with onshore batteries. She remained off the beachhead for three days as watchdog for the vast armada of ships lining up with men and supplies, then retired across the English Channel to Plymouth, England, screening the battleship . Returning to the assault area 11 June, Emmons served in the screen guarding transports and supply ships from submarine attack. After replenishing at Portland, England, from 21 to 24 June, she kept watch around battleships and cruisers on 25 June in the Task Force 129 Bombardment of Cherbourg supporting the U.S. First Army VII Corps victory at the Battle of Cherbourg. Emmons returned to Mers-el-Kebir 10 July 1944 with a transport convoy she had brought across from Portland, then had escort duty in the Mediterranean ports preparing for the assault on southern France. She sailed from Taranto, Italy, for the beachheads, 11 August, and on the 15th began pre-invasion bombardment. She remained off the beaches all day to provide fire support to troops storming ashore. Escort duty took her away to Italian and Corsican ports, but she returned to patrol off the French Riviera until October. 1944-1945, Transfer to Pacific and loss Emmons put into Boston on 9 November 1944 for conversion to a high-speed destroyer minesweeper, and was reclassified as DMS-22. After