In the short years of peace Pajol, now colonel, was successively envoy to the Batavian Republic, and delegate at Napoleon I's coronation (the start of the First French Empire). In 1805, the emperor employed him with the light cavalry. He distinguished himself at the battle of Austerlitz, and, after serving for a short time in the Italian Peninsula, he rejoined the Grande Armée as a general of brigade, in time to take part in the campaign of Friedland. The next year (1808) he was made a "Baron d’Empire".