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 "Luftwaffe" (German air force) operated "Stalag Luft" in which flying personnel, both officers and non-commissioned officers, were held. The "Kriegsmarine" (German navy) operated "Marlag" for Navy personnel and "Milag" for Merchant Navy personnel. Civilians who were officially attached to military units, such as war correspondents, were provided the same treatment as military personnel by the Conventions. The Third Geneva Convention, Section III, Article 49, permits non-commissioned personnel of lower ranks to be used for work in agriculture and industry, but not in any industry producing war material. Further articles of Section III detail conditions under which they should work, be