Even before the victory in the North African campaign in May 1943, there was disagreement among the Allies on the best strategy to defeat the Axis. The British, especially the prime minister, Winston Churchill, advocated their traditional naval-based peripheral strategy. Even with a large army, but greater naval power, the traditional British answer against a continental enemy was to fight as part of a coalition and mount small peripheral operations designed to gradually weaken the enemy. The United States, with the larger U.S. Army, favoured a more direct method of fighting the main force of the German Army in northwestern Europe. The ability to launch such a campaign depended on first winning the Battle of the Atlantic.