Land mine invention by the Polish officer Józef Kosacki. His invention, known as the Polish mine detector, was used by the Allies alongside mechanical methods, to clear the German mine fields during the Second Battle of El Alamein when 500 units were shipped to Field Marshal Montgomery's Eighth Army. The Nazis used captured civilians who were chased across minefields to detonate the explosives. According to Laurence Rees "Curt von Gottberg, the SS-Obergruppenführer who, during 1943, conducted another huge anti-partisan action called Operation Kottbus on the eastern border of Belarus, reported that 'approximately two to three thousand local people were blown up in
The Man Who Never Was screenplay of the film stayed as close to the truth as was convenient, with the remainder being fiction. For example, the Irish spy in the film is a complete fabrication. The British Secret Service controlled the German spy network in the UK with its Double-Cross System, though this fact was still secret at the time the film was made. Ewen Montagu declared that he was happy with the fictitious incidents which, although they did not happen, might have happened. During filming, Montagu has a cameo role, that of a Royal Air Force air vice-marshal who has doubts about the feasibility