In the subsequent campaigns he commanded the left wing ‘of the French armies on the Rhine between Neuwied and Düsseldorf, and took a part in expeditions to the Lahn and the Main rivers.

[2] In 1798 Championnet was named commander-in-chief of the Army of Rome which was tasked with protecting the Roman Republic against attacks by the Kingdom of Naples and the Royal Navy.

Leading the Neapolitan army, the Austrian general Karl Mack von Leiberich had a tenfold superiority in numbers, but Championnet held his own and captured Naples itself, and there established the Parthenopaean Republic.

[1] He became involved in a quarrel with Guillaume-Charles Faipoult, one of the "Representatives on mission" (political commissar), was relieved with the accusation of graft, and subsequently imprisoned for a short time.

[citation needed] The campaign which followed was uniformly unsuccessful and, worn out by the unequal struggle, Championnet died at Antibes in the French Maritime Alps.