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This area might be where 'Ali fought and beat the rebel Kharijites. The Kharijites fought for 'Ali during the Battle of Siffin, but on the way back to Kufa they rebelled and stationed themselves in Nahrawan. After the Kharijites attacked some of the inhabitants, 'Ali marched his remaining troops to Nahrawan to stop the Kharijites. Because he was hesitant to fight what once were allies, 'Ali offered any Kharijites his protection if they joined his side. Many did, except for about 1,800 men. 'Ali's large army easily defeated them. I think this is where the battle happened becasue 'Ali had to cross the Tigris river, and he was heading toward Syria from Kufa when he stopped at Nahrawan.(http://en.wikipedia.org/wiki/Battle_of_Nahrawan)