The Polish Air Forces () was the name of the Polish Air Forces formed in France and the United Kingdom during World War II. The core of the Polish air units fighting alongside the Allies were experienced veterans of the 1939 invasion of Poland. They contributed to the Allied victory in the Battle of Britain and Allied air operations during the war. A total of 145 Polish fighter pilots served in the RAF during the Battle of Britain, making up the largest non-British contribution. By the end of the war, around 19,400 Poles were serving in the Polish Air Forces in Great Britain and in the RAF. History After the German-Soviet invasion of Poland of 1939, most of the flying personnel and technicians of the Polish Air Force were evacuated to Romania and Hungary, after which thousands found their way to France. There, in accordance with the Franco-Polish Military Alliance of 1921 and the amendments of 1939, Polish Air Force units were to be re-created. However, the French headquarters was hesitant about creating large Polish air units, and instead most Polish pilots were attached to small units, so-called keys. Only one large unit was formed, the Groupe de Chasse polonaise I/145 stationed at Mions airfield. However, it was not until May 18, 1940 that this unit was equipped with planes – and even then these were the completely obsolete Caudron C.714 fighters. After 23 sorties the bad opinion of the plane was confirmed by the front-line pilots. It was seriously underpowered and was no match for the enemy fighters of the period. Because of that, on May 25, only a week after the plane was introduced to active service, French minister of war Guy la Chambre ordered all C.710s withdrawn. However, since the French authorities had no other planes to offer, the Polish pilots ignored the order and continued to use the planes. Although the planes were hopelessly outdated compared to the Messerschmitt Bf 109Es they faced, the Polish pilots nevertheless scored 12 confirmed and 3 unconfirmed kills in three battles between June 8 and June 11, losing 9 in the air and 9 more on the ground. Among the planes claimed shot down were four Dornier Do 17 bombers, but also three Messerschmitt Bf 109 and five Messerschmitt Bf 110 fighters. The rest of the Polish units were using the slightly more reliable Morane-Saulnier M.S.406 fighter. A small improvised