Kammala jumla mai zuwa: An haifi Cillart ga dangin Madeleine de Bernard da Joseph-François de Chabert, wani jami'in sojan ruwa. Ya shiga Navy a matsayin Garde-Marine a 1741, kuma ya shiga cikin yakin Toulon a Cape Sicié a ranar 22 zuwa 23 ga Fabrairu 1744, yana aiki a kan "Diamant" mai bindiga 50. A cikin 1745, ya yi aiki a kan "Trident" da "Espérance" a cikin manufa biyu zuwa Martinique. A shekara ta 1746, ya kasance a kan "Castor" kuma ya shiga cikin kamawa na Birtaniya "Albany" daga Acadia. Shekara guda bayan haka, an kama shi a kurkuku a
Yaƙin farko na Cape Finisterre a ranar 14 ga Mayu 1747. Chabert ya ci gaba da zama Ensign a 1748.