The Allied victory in 1945 was not inevitable. Overy shows us exactly how the Allies regained military superiority and why they were able to do it. He recounts the decisive campaigns: the war at sea, the crucial battles on the eastern front, the air war, and the vast amphibious assault on Europe. He then explores the deeper factors affecting military success and failure: industrial strength, fighting ability, the quality of leadership, and the moral dimensions of the war.