Assertion: caliphate's army | /r/HasProperty | amr ibn al-as
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Source sentences:
text: After Khalid consolidated his control of Iraq, Abu Bakr sent four armies to Syria on the Byzantine front under four different commanders: Abu Ubaidah ibn al-Jarrah (acting as their supreme commander), Amr ibn al-As, Yazid ibn Abu Sufyan and Shurhabil ibn Hasana.