Assertion: caliphate's army | /r/CapableOf | defeat byzantine
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Source sentences:
text: The Muslim army defeated the Byzantines and Antioch surrendered on 30 October 637 CE.
text: After the decisive victory at Ongala in 680 the armies of the Bulgars and Slavs advanced to the south of the Balkan mountains, defeating again the Byzantines who were then forced to sign a humiliating peace treaty which acknowledged the establishment of the First Bulgarian Empire on the borders of the Empire.