"The Polish Air Force in the Battle of Britain" In the summer of 1940 the first Polish squadrons were formed in Fighter Command. No. 303 'City of Warsaw' Squadron was the top-scoring RAF unit in September 1940, with nine of its pilots claiming five or more kills. Pilot Officers Jan Zumbach (left) and Mirosław Ferić, two of its aces, playing with the Squadron's mascot - a puppy dog. RAF Leconfield, 24 October 1940.