Kammala wannan jumla: Gangl ya sami ci gaba zuwa Oberfeldwebel a watan Nuwamba 1938. Daga Oktoba 1939 ya kamata ya yi karatu a makarantar jami'in Wehrmacht. Duk da haka, rundunarsa ta kasance a cikin Saar-Palatinate a kan iyaka da Faransa, a shirye-shiryen yaki. A can, a ranar 7 ga Satumba, 1939, rukunin Faransa goma sha ɗaya, mai nisan kilomita 25, sun ƙetare iyakar kuma sun ci gaba da nisan kilomita 8 a cikin yankin Jamus. Ko da yake, sun janye cikin makonni biyu a kan umarni daga Gamelin. Wannan shi ne karo na farko da Gangl ya yi yaƙi a Yaƙin Duniya na Biyu. Gangl ya kwashe watanni shida a asibitoci a cikin watanni masu zuwa na "Yakin Ƙarya". Ya koma ga rundunarsa a ranar 14 ga Mayu, 1940, kuma ya shiga cikin yaƙin yamma. A can ya yi aiki a matsayin kwamandan wani rukunin bincike na rukunin 25 na Sojojin Wehrmacht. Bayan da
Armistice na Compiègne, ya kasance mai koyarwa a sashen maye gurbin bindigogi na 25. Bayan ɗan gajeren izinin gida a watan Agusta 1940, ya kasance mai koyarwa a wani tushe a Taus a cikin Protectorate na Bohemia da Moravia. Ya fara horo na wata guda a makarantar harbi a Jüterbog a ranar 25 ga Nuwamba, 1940.