This WW2 history documents the 'deception' strategies of the Allies in their attempt to confuse the Nazis as to the real strategies and troop strenght of the Allies. In particular the attempt to make sure the Germans did not know that the D-Day invasion of Nomrandy was 'the' invasion, leading them to believe that the real invasion would take place in Calais. This worked wonderfully and the Germans held large numbers of troops at Calais that could have been used to interupt the Normandy invasion. Surprisingly despite the title Patton plays a very minor part in this book.