"Anderson" then underwent repairs and alterations into early August; during her time in the yard, her number three 5 inch (127 mm) mount was removed to save topside weight and allow the fitting of additional .50 caliber (12.7 mm) machine guns, extensions to her depth charge tracks, and a "Y"-gun (depth charge projector), in addition to two dozen additional depth charges. Thus refitted to better perform the escort role needed in the developing Battle of the Atlantic, she participated in intensive antisubmarine exercises out of Provincetown, Massachusetts, during the latter half of August 1941 before returning to Boston on the 30th. "Anderson"s operations now carried her farther north, as she sailed for Casco Bay, Maine, on 2 September, exercising with "Tuscaloosa" en route.