Battle of Ullais [SEP] point in time
Battle of Ullais
The Battle of Ullais () was fought between the forces of the Rashidun Caliphate and the Sassanid Persian Empire in the middle of May 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 Sassanian and Arab Christian casualties.
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
commander in chief Khalid ibn Walid of the location of the hostile Arabs. Khalid tried to reach Ullais before the Sassanid army could reinforce them, in order to avoid a battle with an army that would heavily outnumbered his own; however he failed to do so. In order to deny the Persians time to organize and to coordinate their plans, Khalid decided to fight the battle that very same day.
According to modern geography the battlefield lies 25 miles south-east of the Iraqi city of Najaf, and about 4 miles