After the Battle of Yermuk, which was won by the Muslims Khalid bin Waleed was removed by the Caliph Umar (RA) from his supreme command. The new Supereme Commander was:

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Accepted Answer

Saad bin Abi Waqas (RA). Saad bin Abi Waqas (RA) was the established commander in Iraq and is historically cited as taking over major military roles after key victories. Amr bin Al Aas (RA) was primarily associated with Egypt's conquest. Abu Ubaydah (RA) was not the designated successor to Khalid bin Waleed at that time. Hazrat Bilal (RA) held a different role and was not appointed supreme commander.