Abū Sulaymān Khālid ibn al-Walīd ibn al-Mughīrah al-Makhzūmī , also known as Sayf ullah al-Maslūl was a companion of Muhammad. He is noted for his military tactics and prowess, commanding the forces of Medina under Muhammad and the forces of his immediate successors of the Rashidun Caliphate, Abu Bakr and Umar ibn Khattab. It was under his military leadership that Arabia, for the first time in history, was united under a single political entity, the Caliphate. Commanding the forces of the nascent Islamic state, Khalid was victorious in over a hundred battles, against the forces of the Byzantine-Roman Empire, Sassanid-Persian Empire, and their allies, in addition to other Arab tribes. His strategic achievements include the conquest of Arabia during the Ridda Wars, Persian Mesopotamia and Roman Syria within several years from 632 to 636. He is also remembered for his decisive victories at Yamamah, Ullais, and Firaz, and his tactical successes at Walaja and Yarmouk.Khalid ibn al-Walid was from the Meccan tribe of Quraysh, from a clan that initially opposed Muhammad. He played a vital role in the Meccan victory at the Battle of Uhud against the Muslims. He converted to Islam, and joined Muhammad after the Treaty of Hudaybiyyah and participated in various expeditions for him, such as the Battle of Mu'tah, which was the first battle between the Romans and the Muslims. Khalid ibn Al-Walid reported that the fighting was so intense, that while fighting, he broke nine swords in the battle. This earned him the title ‘Saif-ullah' meaning "The Sword of Allah". Khalid took over after Zayd ibn Haritha, then Jafar ibn Abi Talib, then Abdullah ibn Rawahah were killed. After Muhammad's death, he played a key role in commanding Medinan forces for Abu Bakr in the Ridda wars, conquering central Arabia and subduing Arab tribes. He captured the Sassanid Arab client Kingdom of Al-Hirah, and defeated the Sassanid Persian forces during his conquest of Iraq . He was later transferred to the western front to capture Roman Syria and the Byzantine Arab client state of the Ghassanids.
Although Umar later relieved him of high command, he nevertheless remained the effective leader of the forces arrayed against the Byzantines during the early stages of the Byzantine–Arab Wars. Under his command, Damascus was captured in 634 and the key Arab victory against the Byzantine forces was achieved at the Battle of Yarmouk , which led to the conquest of the Bilad al-Sham .
In 638, he was dismissed from military services.
Khalid fought around 200 battles, both major battles and minor skirmishes as well as single duels, during his military career. Having remained undefeated, he is claimed by some to be one of the finest military generals in history.
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592 – 642
