He was a deputy to the Legislative Assembly of 1791, a Representative during the Hundred Days of 1815 and a provisional commissioner (minister) in the French Executive Commission of 1815.

Carnot was made Director of the General Department of fortifications, and was instructed to verify the status of the armies on the northern border.

He went in turn to the armies of the Moselle and of the Rhine, and later directed the fortifications of Dunkirk when it was besieged by the British.

[1] When his brother, Lazare Carnot, became a member of the Directory, Carnot-Feulins was promoted brigadier on 16 Prairial year IV and was called back to Paris.

[1] Carnot-Feulins returned to his position in the army, but soon resigned due to an argument with the First Consul (Napoleon) about the expedition to Santo Domingo, where he was to be in command of engineering.

During the Hundred Days, when Napoleon returned from exile, on 12 May 1815 he was elected a Member of the House of Representatives for Chalon-sur-Saône.