Amazon Prime has a World War 2 investigative video called 'Dieppe Uncovered'.
The raid was mostly with Canadian soldiers. Some US Army Rangers did participate in this raid.
The cover story for decades was that this was just a test of a future invasion of France. The real reason of going into this raid was to try to capture a four- rotor Enigma Machine used by the Germans to communicate with ships and submarine
The British had broken the codes of the 3- rotor Enigma Machine.
This was shown in the movie the Imitation Game.
In early nineteen forty two comma british intelligence was completely hampered because Germany was transitioning all its forces to go to the New 4-rotor Enigma machine.
The real reason for the raid was to capture this upgraded Encryption machine and bring it back to England.
Future James Bond author Ian Fleming was a naval intelligence Officer who was involved with planning this raid or 'pinch'.
The raid was not successful and the only surviving soldier of the original platoon still living was not told that his real mission was meant to capture the newest Enigma machine at the German headquarters in Dieppe knew they were there to go into a Headquarters. His lieutenant knew this,but he kept at a secret from his men. The lieutenant was handpicked by Ian Fleming because the lieutenant was The Son of a former Prime Minister.
The historian tells the surviving members of the Dieppe raid that their slaughter was not in vain.
916 Canadians died in this battle. 3,367 casualties and 1,946 were taken as prisoners of war.
Only 2,210 managed to get back to England.