I've looked everywhere for information on the matter. But I would like to know if the armies of the Hellenistic successor kingdoms could be described as professional or semi-feudalistic? I realize that their armies were generally ad-hoc in nature and didn't necessarily have an advanced administrative support system that was developed by the Roman legions, but at least were the main Pezhetairoi infantry units nationalized professional soldiers, or were they all mercenaries or levied citizen militia?