In the Luftwaffe, Stigler became an instructor pilot. As a member of
Jagdgeschwader 27 (JG 27) in
North Africa as well as
Europe, and of the
Jagdverband (JV) 44 jet fighter squadron, the aircraft Stigler flew in combat were the
Messerschmitt Bf 109 and
Messerschmitt Me 262. In North Africa, Stigler flew in the
Schwarm made up of
Oberleutnant Ferdinand Vögl, the commander of 4.
Staffel,
Oberfeldwebel Karl-Heinz Bendert,
Oberfeldwebel Erwin Sawallisch and Stigler. At the time, most of the aerial victories claimed by II.
Gruppe were allegedly achieved by pilots of 4.
Staffel, of which 63 out 66 claims were attributed to these four pilots alone. In comparison, the claims filed by Vögl, Bendert, Sawallisch and Stigler far exceeded the number of aerial victories claimed by other units of JG 27 and raised significant doubt within the Luftwaffe. This
Schwarm of JG 27 was prevented from flying together after 59-kill ace
Hans-Arnold Stahlschmidt reported that he saw them shooting into the dunes of the desert during a mission in which they claimed 12 aerial victories. On 15 May 1943, Stigler was injured when his Bf 109 G-6 (
Werknummer 15371—factory number) suffered engine failure and he was forced to
bail out near the
Milo Airfield, Sicily. On 13 January 1944, Stigler was appointed
Staffelkapitän (squadron leader) of 12.
Staffel of JG 27. He succeeded
Oberleutnant Werner Küffner who had been
killed in action the day before. The
Staffel was subordinated to IV.
Gruppe of JG 27 under the command of
Hauptmann Otto Meyer. On 13 May, Stigler was transferred and command of 12.
Staffel was then given to
Oberleutnant Ernst-Wilhelm Reinert. Stigler was then appointed
Staffelkapitän of 8.
Staffel of JG 27. He succeeded
Oberleutnant Kurt Hammel who was transferred. On 15 August, 8.
Staffel was renamed to 11.
Staffel. When on 1 October, the
Gruppenkommandeur (group commander) of III.
Gruppe of JG 27,
Major Ernst Düllberg, was transferred, Stigler temporarily assumed command of the
Gruppe. On 27 October, Stigler was transferred to
Ergänzungs-Jagdgeschwader 1. Command of 11.
Staffel was then passed to
Oberleutnant Karl Kohl while command of the
Gruppe went to
Oberleutnant Peter Werfft. == B-17 incident ==