Polish 7th Air Escadrille (), better known as the Kościuszko Squadron, was one of the units of the Polish Air Force during the Polish-Soviet War of 1919-1921. Formed in late 1918, it was re-formed in late 1919 from US volunteers. It was one of the most active Polish squadrons in the war. Operational history The unit was formed when Poland regained independence, on 7 November 1918 in Kraków, as the 3rd Air Escadrille, utilizing mostly bomber and reconnaissance aircraft left by Austro-Hungarian forces. On 25 November 1918 it was moved to Lwów (current Lviv), where it took active part in fighting of the Polish-Ukrainian War until June 1919. On 21 December 1918, after unification of Polish air units' names, its name was changed to the 7th Air Escadrille. It was commanded by Jerzy Boreysza, from April 1919 by Stefan Stec. Among pilots was World War I Ace Mieczysław Garsztka and Harvard graduate Edmund Pike Graves. Number of aircraft was variable, in May 1919 it possessed 3 fighters Fokker D.VIII (E.V), 3 reconnaissance Hansa-Brandenburg C.I and 1 LVG C.V. In June 1919 the escadrille was converted into fighter unit, then in September it was withdrawn into reserve. In October 1919 the commander became Ludomił Rayski. In late 1919 eight American volunteers, including Major Cedric Fauntleroy and Captain Merian C. Cooper, arrived in Poland from France where in September 1919 they had been officially named the Kościuszko Squadron (after the Polish American hero Tadeusz Kościuszko) with Major Fauntleroy as its commander. After reaching Poland the men from Kościuszko Squadron joined the 7th Squadron. More pilots arrived during the following weeks - in all, there served 21 American pilots, along with several Polish pilots, including Ludwik Idzikowski, the ground crew was all Polish. In November 1919 Major Fauntleroy took the command and on 31 December 1919 the escadrille took the name Kościuszko Squadron. Meanwhile, the Polish Air Force underwent reorganization. Even though most volunteers asked to be sent to the frontlines as soon as possible, the Polish high command delayed their deployment in view of the coming Polish offensive. The Kościuszko Squadron was the first air squadron to use a railway train as a mobile flying base with specially designed railroad cars that could transport their aircraft as the front moved and developed. The train also included the squadron's operational headquarters, aircraft spares and repair workshops and living quarters. The Kościuszko Squadron was