During the Neapolitan Warin 1815 he served as a corps commander and was dispatched to southern Italy with a 20,000 strong force to prevent the Joachim Murat, the King of Naples, from conquering Italy. He eventually was made commander of the small army, commanding his own corps and that of Adam Albert von Neipperg. He gained a decisive victory against Murat at the Battle of Tolentino, which earned him the title of Duke of Casalanza from Ferdinand I of the Two Sicilies.