Antigonus deployed his army obliquely, the right wing leading, in the same fashion used by Alexander and Philip. Antigonus deployed his light horse (c. 7,000 horsemen) on the left under Peithon, his heavy cavalry (3,700 horsemen) and light infantry were placed on the right flank resting on the hills under his own command and his phalanx held the center, with the Macedonians on the right, the Asians in the center and the mercenaries (probably Greeks) on the left, while the war elephants were spread across the line. Eumenes, also placed his phalanx in the center, with the elite Argyraspides and Hypaspists on the right of the phalanx. His left flank, resting near the hill, was made up of cavalry, elephants, and auxiliaries. The right flank was led by Eumenes himself with his heavy cavalry (2,900 horsemen). Antigonus's oldest son Demetrius, aged about twenty, was with his father commanding the heavy cavalry on the right and making his major combat debut.