1943-1944
After a brief overhaul at Charleston, Ericsson returned to patrol and escort duty in the Caribbean and to Recife and Trinidad. In May 1943, she made the first of five convoy escort voyages to Casablanca from east coast ports, between which she joined in training, and patrolled the western Atlantic. On 11 February 1944 she arrived at Gibraltar for duty in the Mediterranean, and through the next six months, operated primarily to support the troops fighting the bitter campaign for Italy. She escorted convoys and carried passengers between north African and Italian ports, bombarded points near the fiercely contested Anzio area and in the Gulf of Gaeta, patrolled off anchorages and harbors, and joined in exercises preparing for the invasion of southern France.
On 13 August 1944, Ericsson sortied from Malta in a task group composed primarily of British ships, but including one French ship and the remainder of Ericsson's division. This group covered one section of the amphibious landings on southern France from 15 to 17 August, and Ericsson, after screening HMS Ramillies to Corsica, returned to join an American task group and fire bombardments along the French coast. She also served on patrol, and on 27 August intercepted a trawler, in which the crew of a German submarine, previously grounded and scuttled in the area, were attempting to escape through the American patrol line. Fifty prisoners were thus taken. Ericsson remained in the Mediterranean for patrol and escort assignments until 11 November, when she sailed from Oran to the Azores on escort duty. Upon her return to Gibraltar, she got underway for New York City, arriving 30 November for overhaul.
After refresher training, Ericsson escorted a convoy to Oran from the east coast in April 1945, and while returning to Boston, on 5 May joined Atherton and Moberly in a submarine hunt off Block Island. With other ships joining from time to time, and two airships helping to determine the final sinking, the three ships found and sank U-853. At Boston from 6 May to 18 June, Ericsson prepared for Pacific service, and after training in the Caribbean and at Pearl Harbor, escorted a group of transports to Saipan, arriving 13 September 1945.
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