Of the 5,000 Canadian taking part, about one fifth were killed and over one third were taken prisoner.
Planning was overseen by Vice-Admiral Mountbatten, Chief of Combined Operations. After the disaster, lack of secrecy, lack of supporting naval firepower, and lack of air support were cited as reasons for the failure. A Canadian armoured regiment took part in the operation but the tanks failed to get off the beach.
Pressure from Stalin to mount a ‘Second Front’ is sometimes cited as a reason for the raid. The lessons learned at Dieppe were later put to use in planning the much larger amphibious landings in North Africa (Operation Torch) and Normandy (Operation Overlord).