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Colbert joined the army as a private, but soon became aide-de-camp to Emmanuel Grouchy, then to Joachim Murat and served in the Army of Italy.
It was followed by the foot artillery of the Guard, four batteries of 12-pounders, under the command of Lieutenant-Colonel Antoine Drouot, and, shortly after, by the pieces from the "Army of Italy".
With the Army of Italy at the crossing of the Tagliamento (16 March 1797), Dorsenne's heroic conduct was noticed by commander-in-chief, general Napoleon Bonaparte, who promoted him to the rank of chef de bataillon (battalion commander).