Rubuta ci gaba ga wannan sakin layi - Daga zuriyar Burgundy mai daraja, ya kasance dalibi a makarantar soja ta Brienne, sannan ya kammala karatun makarantar soja ta Paris. Nansouty ya fara aikin soja a 1785, a matsayin mataimakin laftanan a cikin rundunar "Bourgogne-Infanterie", inda mahaifinsa ya yi aiki a lokacin yaƙe-yaƙe na Louis XV. Wani jami'in sojan doki a lokacin barkewar yaƙe-yaƙe na juyin juya halin Faransa a 1792, Nansouty an ba shi izini a matsayin " mataimakin sansanin " ga Marshal Nicolas Luckner. A lokacin Daular Farko
, ya ga sabis a matsayin laftanan-kolonel da kwamandan rundunar soja a cikin 9th (mai nauyi) Cavalry Regiment, ya yi yaƙi tare da sojojin Faransa a kan Rhine da Jamus. An gabatar da shi zuwa Colonel a 1793 kuma ya ba da umurnin 9th Cavalry, an san shi da yawa da aka yi wa dakarun sojan doki. Daga karshe ya zama Brigadier Janar a 1799, bayan da ya ki amincewa da ci gaba sau da yawa a baya, Nansouty ya yi yaƙi a shekara mai zuwa a karkashin Janar Jean Victor Moreau a kudancin Jamus, a cikin yakin neman zabe na biyu.