Rubuta ci gaba don wannan sakin layi - Tare da barkewar yaƙe-yaƙe na Napoleon, an ba Saint-Sulpice umarnin brigade na cuirassier a cikin d'Hautpoul's 2nd division na dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun Grande Armée, wanda zai umurci tsakanin 1805 da 1807. A yakin Eylau a 1807 Saint-Sulpice ya ji rauni, amma mako guda bayan haka, a ranar 14 ga Fabrairu, ya sami ci gaba zuwa janar na rarrabuwa kuma ya dauki umurnin na 2 na dakarun doki masu nauyi, ya maye gurbin d'Hautpoul, wanda ya mutu daga raunin da ya samu. An kira shi da lambar Empire a 1808, ya yi yaƙi a yawancin manyan abubuwan da suka faru na Fifth Coalition a 1809: Abensberg
, Eckmühl, Ratisbon, Aspern-Essling da kuma Wagram. A lokacin mamayewar Faransa na Rasha, Saint-Sulpice an ba shi umurnin rundunar dragoon na Tsaro. A shekara mai zuwa, a watan Maris na 1813, an nada shi gwamnan fadar Fontainebleau amma sai aka sake kiransa ya yi aiki a cikin Grande Armée don Yaƙin Haɗin Kai na shida, yana yaƙi a Saxony. A cikin 1814, yayin da yaƙin ya ci gaba, a wannan lokacin a ƙasar Faransa, an sanya Saint-Sulpice don yin aiki a ƙarƙashin Marshal na Daular Pierre Augereau, wanda umarninsa shi ne ya kare Lyon daga mamaye sojojin Allied. Bayan ya yi ritaya daga aiki, ya zama Peer na Faransa a 1831. Sunansa ya bayyana a kan Arc de Triomphe a Paris.