františek's unit retreated again, to sosnowice wielke airfield near parczewo. from 7 september he flew reconnaissance missions in unarmed 2-person rwd 8 and pws-25 training aircraft, carrying an observer. on 19–20 september he attacked enemy columns near kamionka strumiłowa, throwing hand grenades at german troops below. on 20 september his aircraft was damaged by enemy fire from the ground so he made a forced landing near złoczów. two other pilots, one of whom was another czechoslovak, landed and rescued františek and his polish observer.