Second Fitna: The Battle of al-Harra was fought between Umayyad forces and the rebel defenders of Medina at a lava field northeast of the city. Battle of al-Harra: The Battle of al-Harra was fought between the Umayyad army of the caliph Yazid I led by Muslim ibn Uqba and the defenders of Medina from the Ansar and Muhajirun factions, who had rebelled against the caliph. The battle took place at the lava field of Harrat Waqim in the northeastern outskirts of Medina on 26 August 683 and lasted less than a day. August 26, 683. Wiki link