Battle of Ullais

The Battle of Ullais (Arabic: معركة أليس) was fought between the forces of the Rashidun Caliphate and the Sasanian Persian Empire in the middle of June 633 AD in Iraq, and is sometimes referred to as the Battle of Blood River since, as a result of the battle, there were enormous amounts of Persian Sasanian and Arab Christian casualties.

Battle of Ullais
Part of Muslim conquest of Persia

Overview of the region where the Battle of Ullais was fought, showing the river Euphrates and its tributary the Khaseef (Iraq)
DateMay 633 A.D.
Location
Sasanian Mesopotamia (modern Iraq)
31°37′4.001″N 44°34′10.999″E
Result Rashidun victory
Belligerents
Rashidun Caliphate Sasanian Empire
Arab allies
Commanders and leaders
Khalid ibn al-Walid
Al-Muthanna ibn Haritha
Jaban
Abdul-Aswad 
Abjar 
Strength
18,000 70,000 (Primary Arab sources)
30,000 (modern estimation)
Casualties and losses
~2,000 70,000 killed (Primary Arab sources)
Location within Iraq

This was now the last of four consecutive battles that were fought between invading Muslims and the Persian army. After each battle the Persians and their allies regrouped and fought again. These battles resulted in the retreat of the Sasanian Persian army from Iraq and its capture by Muslims under the Rashidun Caliphate.

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