Assertion: caliphate's army | /r/HasProperty | led by umar ibn saad
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Source sentences:
text: At the command of Yazid son of Muawiya, an army led by Umar ibn Saad, a commander by the name of Shimr Ibn Thil-Jawshan killed Ali's son Hussein and his family at the Battle of Karbala in 680, solidifying the Shia-Sunni split.