Squadron 303 (Polish: Dywizjon 303) is a non-fiction book written by Polish author Arkady Fiedler and published by Peter Davies. It became his most popular book, selling over 1.5 million copies. Written in 1940, published in August 1942, the book is about the legendary No. 303 ("Kościuszko") Polish Squadron (Polish: 303 Dywizjon Myśliwski "Warszawski im. Tadeusza Kościuszki") of Polish Air Force fighter pilots who flew with Great Britain's Royal Air Force (R.A.F.) during the Battle of Britain. No. 303 ("Kościuszko") Polish Squadron continued the traditions of the earlier Polish 7th Air Escadrille (Polish: 7. Eskadra Lotnicza) or "Kościuszko Squadron", as it was better known, which was one of the most active units of the Polish Air Force during the Polish-Soviet War of 1919-1921. Formed in late 1918, Polish 7th Air Escadrille was re-formed in late 1919 from American volunteers, initially commanded by Cedric Fauntleroy, then by Merian Cooper (who originally recruited the American pilots for this unit). Source: Wikipedia (en)