The "Infantería de Armada" (Navy Infantry) was created by Charles V in 1537, when he permanently assigned the "Compañías Viejas del Mar de Nápoles" (Old Sea Companies of Naples) to the "Escuadras de Galeras del Mediterráneo" (Mediterranean Galley Squadrons). But it was Philip II who established today's concept of a landing force. This was a pure naval power projection ashore by forces deployed from ships that could maintain their ability to fight despite being based on board. This is the period of the famous Tercios (literally "One Third", due to its organisation: one third of musketeers, one third of swordsmen and the final third of pikemen):