 In revenge for Umayr's slaying, Zufar had intensified his raids and inflicted heavy casualties on the caliph's tribal allies in the Jazira.Abd al-Malik resolved to command the siege of al-Qarqisiya in person in the summer of 691, and ultimately secured the defection of Zufar and the pro-Zubayrid Qays in return for privileged positions in the Umayyad court and army.The integration of the Qaysi rebels strongly reinforced the Syrian army, and Umayyad authority was restored in the Jazira.