The story of the high-stakes air campaign to sink the battleship Tirpitz in her Norwegian lair, when a single bomb could end her threat to the Arctic Convoys and alter the war. This is the story of an air campaign in which each bomb could dramatically influence the course of the war. In January 1942, the powerful German battleship Tirpitz sailed into her new base in a Norwegian fjord, within easy reach of the Arctic Convoys. Air Campaign 7.