Siege of Wasit
The siege of Wasit involved the army of the Abbasid revolution under al-Hasan ibn Qahtaba and the future Abbasid caliph al-Mansur, and the Umayyad garrison of Wasit under the last Umayyad governor of Iraq, Yazid ibn Umar ibn Hubayra. Yazid had been forced to abandon Kufa due to a rebellion by Abbasid sympathizers, and fled to Wasit, where he was besieged for 11 months, from August/September 749 to his surrender in June/July 750.