Khuzestan Central Persia Caucasus Pars Khorasan Other geographies Battle of Babylon was fought between the forces of Sasanian Empire and Rashidun Caliphate in 634.
Muslim Arabs won the encounter to maintain their pursuit of conquering Mesopotamia.
Khalid ibn al-Walid already left the leadership of the Muslim army in Iraq as he went to lead a campaign against the Byzantine Empire in Syria.
At that time, the Sasanians under Hormozd Jadhuyih wanted to test the Muslim forces after Khalid leaving; therefore, both sides exchanged letters threatening one another.
Nevertheless, the Arabs led by Al-Muthanna ibn Haritha managed to kill the big elephant and to defeat the Persians who fled the region to Ctesiphon.