Khuzestan Central Persia Caucasus Pars Khorasan Other geographies The Battle of Oxus River was a significant battle in the 7th century, fought between the combined armies of the Sassanid and Göktürk Empires against the Muslim Arab army that had overrun Persia.

Following his defeat, the last Sassanid Emperor, Yazdegerd III, became a hunted fugitive who fled to Central Asia and then to China.

[2] The Sasanian king and the Khakan leading an army of 50,000 cavalry composed of men from Soghd, Turkestan, Balkh and Tokharistan, arrived at Marw al-Rudh.

Yazdegerd meanwhile left from Marw al-Rudh to Merv, from where he took his empire's wealth and proceeded to Balkh to join the Khakan.

He left for Turkestan while his officials took away his treasures and gave them to Ahnaf, submitting to the Arabs and being allowed to go back to their respective homes.

[2] After being defeated at the Battle of Oxus river, Yazdegerd III was unable to raise another army and became a hunted fugitive.