Rubuta ci gaba ga wannan sakin layi - Garnier-Duplessix ya zama babban jami'in kungiyar Legion of Honor a ranar 22 ga Yuli, 1920. An tura Garnier-Duplessix zuwa Alexandretta a Turkiyya a lokacin yakin Faransa da Turkiyya
na shekara ta 1918-21. An nada shi mataimakin janar kuma yana da alhakin daidaitawa da rukunin sojoji uku, batura bakwai na bindigogi, rundunar sojan doki da rundunonin jiragen sama biyu. Wannan rundunar ta mamaye daga gabas zuwa yamma a fadin Cilicia na Turkiyya a watan Oktoba na 1920, ta sadu da tsayayya mai tsanani a Tarsus, inda ta rushe garuruwan Turkiyya a arewacin birnin. Bayan sanya hannu kan Yarjejeniyar Zaman Lafiya ta Cilicia a ranar 9 ga Maris, 1921, Ministan Yakin Faransa Louis Barthou ya rubuta wa Garnier-Duplessix yana neman ya shirya shirin kwashe mutanen Cilicia. Garnier-Duplessix ya amsa tare da bayanin kula da cewa ba shi yiwuwa a kwashe lardin a cikin lokacin da aka nema na wata daya saboda wahalar kafa isasshen rundunar 'yan sanda a wannan lokacin don kiyaye tsari da hana ramuwar gayya, musamman a kan Kiristoci.