Just for the record, that is the "Stele di Novilara", a Picenian engraved stone dating the 7th Century b.C. found in Novilara, region Marche, Italy.
It depicts a naval battle between a ship of Picenian or Illirian pirates and a ship of Picenian mercenaries that are defending a Greek ship.
Some details are missing in our representation here but on the original you can see dead people, slaves and agricultural products which are what the Greek ship was filled with.
Please note how both rudder on the Picenian ships were on a central position, turning on hinges, something that will be forgot and discovered again only in the late Middle Age.
Sources:
http://www.cadnet.marche.it/novilara/pagina3.htmlhttp://etadelferro.forumfree.itM. Fiorentini, "Lavorare con il fuoco - la metallurgia fra aspetti tecnici e storici per un'interpretazione antropologica", Ancona 2011.
Greetings,
Mauro.