In 1798 he entered the service of the King of Naples with permission of Paul I of Russia .
In 1798 he was given command of the 3rd Camp under Karl Mack von Leiberich in the ill - fated invasion of the Roman Republic .
In 1798 he entered the service of the King of Naples with permission of Paul I of Russia , and was given command of the 3rd Camp under Karl Mack von Leiberich in the ill - fated invasion of the Roman Republic .