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 Luft III later camp expansions added compounds for non-commissioned officers (NCOs). The first compound (East Compound) of the camp was completed and opened on 21 March 1942. The first POWs, or , as they called themselves (from "Kriegsgefangene"), to be housed at Stalag Luft III were British and other Commonwealth officers, arriving in April 1942. The Centre compound was opened on 11 April 1942 and originally held British and other Commonwealth NCOs; by the end of 1942, however, they were replaced by USAAF personnel. The North Compound for British airmen, (where the "Great Escape" later occurred) opened on 29 March 1943. A