Saad bin Abi Waqas The Battle of al-Qadisiyyah in Iraq was fought in 636 which resulted in Muslim victory. It was between the Muslim army and the Sassanid Persian army. The battle was fought under Caliph Umar, who had appointed Abu Ubaidah ibn Jarrah commander of the army. Three months before Qadisiyyah the battle of Yarmouk took place which was also a victory for the Muslims. The battle of Yarmouk was agasint the Byzantines. Byzantine and Sassanid Empire had an alleged alliance. Saad bin Abi Waqas as the commander at the battle of Qadisiyyah against the Sassanids.
Khalid Bin Walid was not the commander of the army during Caliph Umar’s time. Umar feared that Khalid’s victory after victory in every battle would make the Muslims think that Khalid was responsible for all the victories instead of Almighty Allah so he had him replaced by Abu Ubaida bin Jarrah. Abu Ubaidah Bin Jarrah kept Khalid with him and would seek advice from him.
Ikrimah ibn Abi Jahl, the son of Abu Jahal, converted to Islam after the conquest of Makkah. He was a military leader during the times of Caliph Abu Bakar. He found against Musaylamah the false prophet in Yamamah. Ikrima died during the battle of Yarmouk. Yarmouk took place 3 months before the battle of Qadisiyyah.

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