Following training exercises in Casco Bay, Maine, "Underhill" got underway before dawn on Independence Day and steamed from Hampton Roads to screen UGS 47, a large, slow convoy bound for Mediterranean ports. "Underhill" conducted battle drills and investigated sonar contacts during the long, uneventful Atlantic voyage. In the Mediterranean Sea on 21 and 22 July, she responded to several air raid warnings, but no enemy action materialized, although the last three convoys to pass along this route had been attacked by German planes.