"In the Pacific, too, the tide had turned - and even more swiftly than in Eastern Europe. At the battles of the Coral Sea and Midway (May and June 1942), Admiral Chester W. Nimitz's carriers first checked and then inflicted heavy casualties on the numerically superior Japanese fleet. As at Kursk, both sides suffered substantial losses, but the relative cost of the battle to the already over-stretched Axis power was far higher; the Japanese would never replace their four sunk carriers, whereas the Americans were still far from the peak of their shipbuilding capacity. The series of battles fought on and around the island of Guadalcanal in the Solomons between August 1942 and February 1943 exposed the vulnerability of Japanese ground forces once the Americans had established naval and air superiority. In May 1943 US forces destroyed the Japanese forces on the Aleutian island of Attu and forced them to abandon Kiska; by September Japanese strategy had degenerated into holding an 8,000-mile last line of defence which they were already losing the means of supplying."