Battle of Siffin
Islam's first civil war reaches its climax
Along the banks of the Euphrates River at Siffin, the armies of Ali ibn Abu Talib and Muawiyah I clashed in a battle that would define the course of Islamic history. The First Fitna reached its bloody apex as thousands fell on both sides. The inconclusive result led to an arbitration that ultimately split Islam into its Sunni and Shia branches.