On the moonless night of August 18th 1942 a flotilla pushes out into the flat water of the Channel. They are to seize the German-held port of Dieppe and hold it for at least twenty-four hours, showing the Soviets the Allies were serious about a second front and to get experience ahead of a full-scale invasion. But confidence turned to carnage with nearly two thirds of the attackers dead, wounded or captured. The raid - the Royal Air Force's biggest battle since 1940- was both a disaster and a milestone in the narrative of the war. It was cited as essential to D-Day, but the tragedy was all too predictable. Using first-hand testimony and highlighting recently declassified source material from archives across several countries, bestselling author Patrick Bishop's account of this doomed endeavour reveals the big picture and unearths telling details that fully bring Operation Jubilee to life for the first time.