Phillips Payson O'Brien challenges the conventional focus on land battles to argue that World War II was won through air and sea power that destroyed Axis military production and equipment before it reached traditional battlefields. O'Brien, a military historian at the University of St Andrews, calculates that over half of German and Japanese military equipment was destroyed by bombing, interdiction, and submarine warfare rather than in ground combat. He examines how Allied air campaigns against factories, transportation networks, and fuel supplies degraded Axis capacity more than celebrated land battles, and how naval superiority allowed the Allies to choose where and when to fight while denying that choice to their enemies. The book reframes the war's narrative: Stalingrad and Normandy matter less than the combined bomber offensive and the Battle of the Atlantic in explaining why Germany and Japan lost. O'Brien analyzes how strategic choices about allocating resources between air, sea, and land forces shaped outcomes, and how national strategic cultures led different powers to different conclusions. The book is not pacifist--it acknowledges the human costs of strategic bombing--but argues for accurate understanding of what actually won the war. O'Brien writes for general readers while engaging specialist debates about military effectiveness and strategic theory.