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As a result of decisive victories against the Byzantines at Ajnadayn (634), Fahl (634 or 635), Damascus (634–635) and Yarmouk (636), the Muslims under Khalid conquered most of Syria. He was reassigned by Abu Bakr to command the Muslim armies in Syria and he led his men there on an unconventional march across a long, waterless stretch of the Syrian Desert, boosting his reputation as a military strategist. Khalid subsequently moved against the largely Christian Arab tribes and the Sasanian Persian garrisons of the Euphrates valley in Iraq. After Muhammad's death, Khalid was appointed to suppress or subjugate Arab tribes in Najd and the Yamama (both regions in central Arabia) opposed to the nascent Muslim state, defeating the rebel leaders Tulayha at the Battle of Buzakha in 632 and Musaylima at the Battle of Aqraba in 633. Khalid coordinated the safe withdrawal of Muslim troops during the abortive expedition to Mu'ta against the Arab allies of the Byzantines in 629 and led the Bedouin contingents of the Muslim army during the capture of Mecca and the Battle of Hunayn in c. Following his conversion to Islam in 627 or 629, he was made a commander by Muhammad, who bestowed on him the title Sayf Allah ('the Sword of God'). He played the leading military role in the Ridda Wars against rebel tribes in Arabia in 632–633, the initial campaigns in Sasanian Iraq in 633–634 and the conquest of Byzantine Syria in 634–638.Ī horseman of the Quraysh tribe's aristocratic clan, the Makhzum, which ardently opposed Muhammad, Khalid played the instrumental role in defeating the Muslims at the Battle of Uhud in 625. Khalid ibn al-Walid ibn al-Mughira al-Makhzumi ( Arabic: خالد بن الوليد بن المغيرة المخزومي, romanized: Khālid ibn al-Walīd ibn al-Mughīra al-Makhzūmī died 642) was an Arab Muslim commander in the service of the Islamic prophet Muhammad and the Rashidun caliphs Abu Bakr ( r. 632–634) and Umar ( r. 634–644).