Warfare > Cardaces
The Cardaces or Kardakes were a heavy infantry unit of the Achaemenid military. Modern historians debate over the tactics, weapons and armor used by the Cardaces as not much is known about them. However, some believe that the Cardaces were used in addition to Greek mercenaries which were highly popular in the Achaemenid army during the later phases of the empire.
Pierre Briant, From Cyrus to Alexander: A History of the Persian Empire. Especially pages 1036-1037.
Jeff Jonas, Kardakes or Cardaces: AtG Designer's notes. (Contains a letter by Duncan Head).
Duncan Head, The Achaemenid Persian Army. Montvert Publications, 1992. pp. 42-43.,