World War II was the largest and most destructive war in history. Some 100 million people fought as combatants across Europe, Africa, and West and East Asia. This series describes why and how the war was fought, and explains its impact on those who lived through it. With Germany in control of mainland Europe, the focus of the war moved elsewhere. This book describes how Allied victory in North Africa led to victorious campaigns in Sicily and Italy, while Hitler's invasion of the Soviet Union opened an Eastern Front. Meanwhile, years of planning culminated in the D-Day landings and an Allied advance on Berlin.