1 Commander in Chief (Darius III) 2 Sub-Commanders 2 Battle Groups of Bactrian and Saka Heavy Cavalry 2 Battle Groups of Persian and Median Heavy Cavalry 1 Battle Group of Arachosian and Paphlagonian Light Horse 2 Battle Groups of Greek or Hoplites 1 Battle Group of Persian Spearmen 1 Battle Group of Archers 1 Battle Group of Slingers