Answer: The Battle of the Zab (Arabic: معركة الزاب) took place on the banks of the Great Zab river on 25 January 750. The battle was fought between the Abbasids and the ruling Umayyad Caliphate. The battle is considered the climax of the Abbasid Revolt, serving as a decisive victory for the rebels that would lead to the complete collapse of Umayyad rule.
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