The North Atlantic was the main battlefield of the German submarines. From the beginning of 1942 the Anglo-American convoys ran on the northern route between Iceland and the ice-free Russian port of Murmansk and Archangelsk. The disruption or destruction of these huge supplies of materials was one of the main tasks of the German U - Boats. Aircraft Carriers, Cruisers, Destroyers, Corvettes and countless smaller Patrol vessels were involved in battles in the Atlantic and the Arctic Ocean and played their part in the outcome of the fighting.