Stalag Luft III it as a longer third-person narrative under the title "The Wooden Horse", which was filmed as "The Wooden Horse" in 1950. He included many details omitted in his first book, but changed his name to "Peter Howard", Michael Codner to "John Clinton" and Oliver Philpot to "Philip Rowe". Williams also wrote a prequel, "The Tunnel", an extended study of the mentalities of life as a prisoner of war. Although not an escape novel, it shows the profound urge to escape, and explores the ways that camp life affected men's emotions. Paul Brickhill was an Australian-born Spitfire pilot, shot down in
Stalag VIII-B of war and civilians. Polish army personnel being repatriated from POW camps were also processed through Lamsdorf and sometimes held there as prisoners for several months. Some were later released, others sent to Gulags in Siberia. By 1943, the famous camp for Allied flight personnel in Sagan - Stalag Luft III - had become so overcrowded that about 1,000, mostly non-commissioned flight personnel, were transferred to Lamsdorf. A part of Stalag VIII-B was separated by building new barbed-wire fences, designated Stalag Luft VIII-B. Thus a camp within a camp was created. However all food was provided from kitchens operated by