After World War I, in 1918, 22 original Hansa-Brandenburg C.I seized by the Poles were among the first aircraft of Polish Air Force. According to some publications, it was the first Polish aircraft to perform a combat flight on 5 November 1918, flown by Stefan Bastyr (others claim he flew Oeffag C.II). They were used in Battle of Lemberg and then Polish–Ukrainian War and Polish–Soviet War. Approximately 30 more aircraft were assembled or built by the Poles afterwards in Lviv and Kraków.