Using cutting-edge colourisation techniques and information taken from recently-released secret documents, we reveal aspects of the war that have previously never been examined.

The German Blitzkrieg allowed them to overrun both Poland and France within weeks. See how this radical military tactic caught the Allies totally unprepared.

Being victorious in western Europe, Nazi Germany controlled Denmark, Norway, the Netherlands, Belgium and France, but Britain remained defiant.

No longer considering Britain a threat, Hitler focuses on Operation Barbarossa.

On December 7, 1941, Japanese planes bomb the U.S. Pacific Fleet in Pearl Harbor.

Italy's failed attacks in the Mediterranean region draw in the Germans.