The Battle of Yarmouk Opens Syria and the Levant to the Rashidun Caliphate
Khalid ibn al-Walid routs a Byzantine army after a six-day battle near the Yarmouk River
Quick facts
- Location
- Yarmouk River, border of modern Syria/Jordan
- Rashidun commander
- Khalid ibn al-Walid
- Byzantine emperor
- Heraclius (r. 610-641 CE)
- Aftermath
- Jerusalem capitulates in 637 CE
What happened
After Abu Bakr sent four divisions to raid Syria, the Rashidun forces took Damascus in 634 CE and pushed north, drawing a major Byzantine counterattack under commanders sent by Emperor Heraclius. The general Khalid ibn al-Walid withdrew his forces south beyond the Yarmouk River to make a stand there, and the two armies fought for six days starting in August 636 CE. On the climactic morning of 20 August, Khalid ordered an advance and enveloped the Byzantine line with cavalry, and the imperial troops routed with heavy losses; their field commander likely died in the fighting. Jerusalem capitulated the following year after receiving safety guarantees personally from Caliph Umar, and the Jewish population that Rome had banished from the city five centuries earlier was allowed to return.
Why it matters
Yarmouk broke Byzantine military power in the region for good and opened Syria, Jordan, and Palestine to Rashidun control, redirecting the empire's remaining troops toward the Sassanian Persian front. It is one of the most decisive battles of the early conquests, converting a series of raids into the permanent loss of the Levant for Byzantium.
How we know
The battle's date, the six-day engagement, and Khalid's tactics are described in the World History Encyclopedia's account of the early Muslim conquests, drawing on the Arabic historical tradition for the campaign narrative.
Sources
- World History Encyclopedia. Early Muslim Conquests (622-656 CE) · Reputable sourceworldhistory.org · The domain "worldhistory.org" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
- World History Encyclopedia. Early Muslim Conquests (622-656 CE) · Reputable sourceworldhistory.org · The domain "worldhistory.org" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
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