WI: Ali ibn Talib crushes the Banu Ummaya

WI Ali ibn Talib, son in law of the Prophet Muhammad and husband to his most beloved daughter Fatima, was swayed by his advisers away from giving mercy to the Ummaya during their revolt and instead crushed them completely when he had the perfect opportunity to do so at the Battle of Siffin instead of accepting the offer of arbitration? By all accounts the Alid forces had the upper hand and it is possible he could have ended the threat of the Ummaya to his position as Caliph.
 
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