being the squadron code for 303 Squadron and "D" the individual aircraft code. All three aircraft carried a cartoon of Donald Duck on the port side of the fuselage, slightly forward of the cockpit. Zumbach's victory tally was marked with German crosses under the cockpit on the port side; confirmed kills were outlined in white, probable kills in red, and damaged aircraft with no outline. After handing over command of 303 Squadron to Squadron Leader Bieńkowski, Zumbach spent a year in staff appointments, including the Polish Air Force Staff College. He returned to flying duties as the commander of the 2nd Polish Air Wing, No 133 Wing. On 25 September 1944, he scored his final victory of the war, a probable kill over a JG 26 Fw 190 over Arnhem. On 30 January 1945, Zumbach was posted to HQ, No. 84 Group. While flying an Auster that was used to visit units under the Group's command, he made a navigational error and ran out of fuel. He force-landed in enemy territory and spent the final month of the war as a prisoner of war. Zumbach's final victory tally was 12 (and two shared) confirmed kills, five probables and one damaged. Post-Second World War Zumbach was demobilised in October 1946 but continued to fly for a living. Under a Swiss passport, he flew contraband around Southern Europe and the Middle East. In January 1962, Zumbach was contracted to organise and command Avikat, the air force of Congolese breakaway state of Katanga, commanding it until December 1962. He went on to deal in second-hand aircraft before again becoming a mercenary in 1967, as he organised and commanded the air force of Biafra, flying the B-26 Invader, using the nom de guerre of John Brown. Based in Enugu, he became well-known among the locals. During that time, he also partook in Biafran air force raids, including killing a Nigerian army chief of staff during an attack on Markudi airfield he led. In 1975, Zumbach published his autobiography, originally available in French under the title Mister Brown: Aventures dans le ciel, it was subsequently published in German, English under the title On Wings of War: My Life as a Pilot Adventurer, and Polish under the title Ostatnia walka: Moje życie jako lotnika, przemytnika i poszukiwacza przygód. (The final battle: My life as a pilot, smuggler, and adventurer). Zumbach died in unclear circumstances on 3