khalid ibn al-walid

what if sassanids reinforced Byzantines in the middle of battle of Yarmuk as a friendly gesture to form an alliance will this surprise attack win the battle? will this cement an allaince and stop arabs ?

Khalid ibn al Walid was one of the best generals the Muslims had, winning several victories over the remaining Arabian tribes in the Ridda Wars, and more prominently, his victories over the Byzantines and Sassanids. But he was initially opposed to Islam, and was one of the Makkan commanders...

Let's say that due to internal issues, it takes longer for the Arabs to be properly united after the death of Muhammad. How does this influence the course of events? Could Antioch remain held by the Romans? Could Mesopotamia be kept by the Persians? Or would the Arabs still conquer as they did...

Khalid ibn al-Walid is widely considered to have been one of the greatest generals in history. He never lost a battle in his long military career, and defeated two of the greatest empires of his day. For his great success, he earned the title Saif-ullah (The Sword of Allah). But while he's most...