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As the front ranks of both the forces committed themselves in the fighting, Khalid fixed his enemy on either flank with the help of his rear wings.

Sir William Muir noted that the casualties of the coalition army "must have been great, for tradition places it at the fabulous number of a hundred thousand"[6] as the remaining fleeting soldiers were pursued and cut down by the cavalry of Rashidun.

[8] There is an Islamic legend, which runs as follows: At the beginning of the battle of Firaz when the odds appeared to be against the Muslims, Khalid undertook an oath that if he was victorious, he would undertake pilgrimage (Hajj) to Mecca, the House of God.

After performing the pilgrimage secretly and fulfilling his vow, Khalid and his party rode back to Al Hirah.