Ancient Greek mercenaries
There is evidence of mercenaries being hired in Ancient Greece from the 6th century BC. The tyrants of that time hired bodyguards from other city-states. It is not known if earlier Aegean armies and navies, such as the Minoans and Mycenaeans, used mercenaries.
A Greek mercenary (left) in the service of an Achaemenid Dynast of Hellespontine Phrygia (center) attacking a Greek psiloi (right) at the time of Pharnabazus II, Altıkulaç Sarcophagus, early 4th century BC.
A peltast was a type of light infantry originating in Thrace and Paeonia and named after the kind of shield he carried. Thucydides mentions the Thracian peltasts, while Xenophon in the Anabasis distinguishes the Thracian and Greek peltast troops.
Agrianian peltas. This peltast holds three javelins, one in his throwing hand and two in his pelte (shield) hand as additional ammunition.
A peltast with the whole of his panoply (on a red-figure kylix)
A peltast fighting a panther (from an Attic white-ground mug, 5th century BC)
Image: Tomb of Payava Battle scene (detail)