Battle of Gaugamela
Orontes fought at the Battle of Gaugamela on the Persian right flank with 40,000 units of infantry and 7,000 of cavalry under his command, where he died. His son, Mithrenes, Satrap of Lydia, had joined Alexander the Great after being defeated at Sardis in 334 BC, and fought at Gaugamela on the side of Alexander. After the battle, Mithrenes was made Satrap of Armenia by Alexander.