Kammala jumla mai zuwa: A watan Afrilu 1805, an nada Saint-Germain janar janar kuma aka ba shi umurni a cikin rukunin dakarun sojan doki na Etienne de Nansouty na 1 kuma don haka ya yi yaƙi tare da Grande Armée a lokacin Yaƙin Ƙungiyar ta Uku da
Yaƙin Ƙungiyar Hudu a lokacin 1805-1806. Wani Baron na Empire a watan Janairun 1809, Saint-Germain ya jagoranci rundunar soja na Nansouty a yakin Aspern-Essling kuma ya ci gaba da zama babban jami'in a watan Yulin 1809. A cikin 1812, ya shiga cikin Kamfen a Rasha, ya sami rauni a yakin Borodino. A watan Satumbar 1813, an kirkiro Saint-Germain a matsayin Count na Daular kuma ya shiga cikin yakin Hanau, inda yake da hannu wajen tilasta wucewar ragowar Grande Armée zuwa Faransa. A lokacin yakin 1814 a Faransa, ya jagoranci wasu shahararrun dakarun sojan doki. A lokacin Maido da Bourbon ya yi kyau sosai kuma a 1818 an nada shi Babban Jami'in Sojan doki.