Another example was in November 1943, when Ōshima was taken on a four-day tour of the Atlantic Wall fortifications on the coast of France. Upon his return to Berlin, he wrote a detailed 20-page report of his visit, giving an account of the location of every German division and its manpower and weaponry. He described tank ditches in detail, armament of turrets located close to the shore, and available mobile forces. That provided valuable intelligence to the planners of the D-Day assault. Connected to that was that the Allies knew that Operation Fortitude was working because just one week before D-Day, Hitler confided to Ōshima that while the Allies might make diversionary feints in Norway, Brittany and Normandy, they will actually open up "an all-out second front in the area of the Straits of Dover". Thus, Ōshima dutifully reported that the bulk of German forces would not be waiting in Normandy but, mistakenly, at the Pas-de-Calais area.