Operation Jubilee, more commonly referred to as the Dieppe Raid, was an Allied assault on the German-occupied port of Dieppe, France, on 19 August 1942, during the Second World War. The main assault lasted less than six hours until strong German defences and mounting Allied losses forced its commanders to call a retreat.
Over 6,050 infantrymen, predominantly Canadian, were supported by The Calgary Regiment of the 1st Canadian Tank Brigade and a strong force of Royal Navy and smaller Royal Air Force landing contingents. It involved 5,000 Canadians, 1,000 British troops, and 50 United States Army Rangers.
Objectives included seizing and holding a major port for a short period, both to prove that it was possible and to gather intelligence. Upon retreat, the Allies also wanted to destroy coastal defences, port structures and all strategic buildings. The raid had the added objectives of boosting morale and demonstrating the firm commitment of the United Kingdom to open a western front in Europe.
None of these overall objectives were met, with only a single landing force achieving its specific objective.