Battle of Siffin

Battle context

The Battle of Siffin was a decisive episode in the First Fitna, the civil war that fractured the early Islamic polity following the assassination of Caliph Uthman. It brought the forces of Caliph Ali ibn Abi Talib, drawn from Iraq, into direct confrontation with the Syrian Arab forces of Mu'awiya ibn Abi Sufyan, the long-serving governor of the Levant who refused to recognize Ali's authority. Although Ali's forces gained the upper hand militarily, fighting was halted when the Syrian side called for arbitration — an appeal Ali accepted under pressure from within his own ranks. The arbitration process, concluded inconclusively in 658, proved politically damaging to Ali: it strengthened Mu'awiya's standing and broadened his support base while undermining Ali's authority among his own constituency and generating internal dissension among the Iraqi forces. That split would contribute directly to the emergence of the Kharijite movement, a faction that broke from Ali in part over his acceptance of arbitration. The battle is regarded as a major step toward the eventual establishment of the Umayyad Caliphate under Mu'awiya, making its outcome — decided as much by the arbitration as by the fighting itself — consequential for the entire subsequent history of Islamic political authority.