In December 1940, she broke out into the Atlantic Ocean to operate against Allied merchant shipping, though this operation ended without significant success. In February 1941, Admiral Hipper sortied again, sinking several merchant vessels before eventually returning to Germany via the Denmark Strait. The ship was then transferred to northern Norway to participate in operations against convoys to the Soviet Union, culminating in the Battle of the Barents Sea on 31 December 1942, where she sank the destroyer Achates and the minesweeper Bramble but was in turn damaged and forced to withdraw by the light cruisers HMS Sheffield and HMS Jamaica.