A fiery commander, often noted for bravery, Dupas was often wounded in action, triggering physical infirmities, which eventually forced him to retire from active service, at first temporarily, in 1809 and then permanently, in late 1813.

At the outbreak of the French Revolutionary Wars, Dupas held the rank of Adjutant-Major of the Allobroges legion, and took part to the annexation of his native Savoy to France and then became aide-de-camp to General Carteaux.

He served as aide-de-camp to Carteaux during the Siege of Toulon and during the operations that the French Army of the Eastern Pyrenees conducted against the Kingdom of Spain, until the two countries made peace in 1795.

Following his return from Egypt, Dupas was appointed Adjutant Supérieur of the Government palace, Colonel of the Mamelukes of the Consular Guard and in 1803 was promoted to Brigadier General.

[1] With the outbreak of the War of the Third Coalition, Dupas was given a command in the Grande Armée, leading an epic attack at the Battle of Austerlitz, where his men were instrumental in forcing 5,000 Russians to surrender.