"it came out that he had joined the army and was in Naples"
Colonel of the 2nd Swiss Regiment in the service of the Kingdom of Naples (c. 1850)
Public DomainColonel of the 2nd Swiss Regiment in the service of the Kingdom of Naples (c. 1850) - Credit: A. di Lorenzo
Kingdom of Naples in 1810
Creative Commons Attribution Share AlikeKingdom of Naples in 1810 - Credit: Eltharion

Prior to 1848, individual Swiss cantons had their own armies. After that date, the armies from the cantons were made into one central army.

Up until 1874, Swiss soldiers sometimes served as merceneries in European battles. They were involved in conflicts in the Kingdom of Naples in southern Italy from 1731 onwards, and had four regiments stationed there during the middle part of the 19th century. On the map, Regno di Napoli is the Kingdom of Naples. The city of Naples is marked as Napoli.