One of the best documentaries I have ever seen. Battle of Dieppe uncovered; James Bond creator involved - YouTube The true reason for the Dieppe Raid is now uncovered. The raid was a PINCH raid disguised as a full operation to fool the Germans. A unit started by Ian Fleming (yes the James Bond author) attempted to get a former river gunboat (flat bottom, shallow draft) into Dieppe Harbour. Their task was to go into the German Naval Headquarters at the Hotel Moderne and snatch the FOUR ROTOR Enigma Codes. They needed to snatch the code books but at the same time not inform the Germans that we had the code books. Otherwise they would have changed the codes. Bletchley Park had been blind to the U Boat code for six months since the Germans had added another rotor to the Enigma. Atlantic convoys were being devastated and times were desperate. The raid (supposedly) failed because the element of surprise was lost. The Canadians task was to silence the guns at the harbour entrance. Most didn't make it off of the beach. The gunboat was severely damaged attempting to break through the harbour entrance. Fleming's Unit was on the gunboat they were to make for the Hotel Moderne and snatch anything, including prisoners, from the German Naval Headquarters there. They were then tasked to give what they had to Commander Robert Dudley Ryder VC who would take it back to England. Dudley Ryder had won the VC during the St Nazaire Raid onboard HMS Cambeltown. We're told that that the raid was unsuccessful however many vessels in the harbour itself also had the Four Rotor Enigma onboard. It is a coincidence that very shortly after Bletchley (with the help of Alan Turing) cracked the four Rotor code. The story told is that they got a code book from U 559 on 30 October 1942. The code was cracked in early November which means that Turing cracked it within a few days. However if the code books had been snatched during the Dieppe raid (19th August) then it would have given them more time.