During the third week of February 1944, the combined Allied air forces based in Britain and Italy launched their first round-the-clock bomber offensive against Germany. Their goal: to smash the main factories and production centers of the Luftwaffe while also drawing German planes into an aerial battle of attrition to neutralize the Luftwaffe as a fighting force prior to the cross-channel invasion, planned for a few months later. Officially called Operation ARGUMENT, this aerial offensive quickly became known as “Big Week,” and it was one of the turning-points of World War II.

On July 10, 1943, the largest amphibious invasion ever mounted took place, larger even than the Normandy invasion 11 months later: 160,000 American, British, and Canadian troops came ashore or were parachuted onto Sicily, signaling the start of the campaign to defeat Nazi Germany on European soil. Operation HUSKY, as it was known, was enormously complex, involving dramatic battles on land, in the air, and at sea. Yet, despite its paramount importance to ultimate Allied victory, and its drama, very little has been written about the 38-day Battle for Sicily.

The Battle of Britain paints a stirring picture of an extraordinary summer when the fate of the world hung by a thread. Historian James Holland has now written the definitive account of those months based on extensive new research from around the world, including thousands of new interviews with people on both sides of the battle.

The night of 16 May, 1943: Nineteen specially adapted Lancaster bombers take off from RAF Scampton in Lincolnshire, each with a huge 9000-lb cylindrical bomb strapped underneath it. Their mission: to destroy three dams deep within the German heartland, which provide the lifeblood to the industries supplying the Third Reich's war machine.

D-Day, June 6, 1944, and the 76 days of bitter fighting in Normandy that followed the Allied landing, have become the defining episode of World War II in the west - the object of books, films, television series, and documentaries. Yet as familiar as it is, as James Holland makes clear in his definitive history, many parts of the OVERLORD campaign, as it was known, are still shrouded in myth and assumed knowledge.