You're British, then? Yes, Jubilee predated Overlord (the Normandy invasion) by almost two years. If memory serves, the Allied forces landing at Dieppe (August 1942) in Operation Jubilee were: British Commandos and Royal Marines; Canadian forces; and a small number of US Army Rangers. It was not a successful operation for the Allies, who suffered about a 2/3 casualty rate -- out of 6,000 to 6,100 men.
Have you tried searching for it? Here's one link from my bookmarks to get you started -- but be aware that the Canadian sites might be best, as they had by far the largest number of troops in this operation --
World War Two -- scroll down about halfway and look for the links on the left -- Dieppe
As far as the Nurnberg Trials stuff goes, that started with the International Military Tribunal in about November 1945 -- with England, France, Russia, and the US. I know that the US Army had troops there -- I'm not sure which troops the Brits sent there -- but I doubt that it would have been the Commandos -- though don't quote me on that.
Again, you may come up with some info by searching online -- for example, is there a site online with military records for England?
Good luck, Tony -- don't hesitate to ask more questions -- there are lots of folks on this forum ready and willing to help get you off in the right direction.
