 Soon after, he was taken prisoner of war by Soviet soldiers but managed to escape and reach Lwów.From there he crossed the new Soviet-German "border of peace" and in October 1939 moved to Warsaw, where he joined an underground organization, "Muszkieterowie" (the "Musketeers").The organization, which was later integrated into the Home Army ("Armia Krajowa"), was an "en cadre" military organization primarily focused on intelligence.