Kammala jumla mai zuwa: Bayan karatu a Kwalejin Soja ta Sorèze (1793 <unk> 1798), ya shiga rukunin Hussards na 1 a matsayin mai sa kai a ranar 3 ga Satumba 1799. Ya yi aiki a karkashin Janar Jean-Mathieu Seras, wanda ya ba shi mukamin sarjan a ranar 1 ga Disamba, 1799. A cikin wannan watan, a ranar 31 ga Disamba, 1799, an daukaka shi zuwa mukamin laftanan na biyu don girmama ƙarfin zuciyarsa. Ya yi yaƙi tare da Sojojin Italiya kuma ya shiga cikin
Yaƙin Marengo da Siege na Genoa, lokacin da mahaifinsa, Janar Jean-Antoine Marbot ya mutu.