 The PWS-26 was mostly used as a replacement aircraft.According to a report by Jan Falkowski, on September 3, 1939, while flying a PWS-26, he made a chasing Bf 109 crash near Lublin, by performing low-level manoeuvres, but there was no confirmation from the Germans.A single PWS-26 and two RWD-8s of the Independent Operational Group Polesie, were the last Polish aircraft in the sky during the campaign.