Ali's inability to punish the murderers of Uthman and Muawiyah's refusal to pledge allegiance eventually led Ali to move his army north to confront Muawiyah. The two armies encamped themselves at Siffin for more than one hundred days, most of the time being spent in negotiations. Neither side wanted to fight. Then on 29 July 657 (11th Safar), the Mesopotamians under Ashtar's command, the Qurra in Ali's army, who had their own camp, started the fighting in earnest. The battle lasted three days. The loss of life was terrible. Suddenly one of the Syrians, Ibn Lahiya, out of fear of further civil war and unable to bear the spectacle rode forward with a copy of the Quran on the ears of his horse to call for judgement by the book of Allah, and the other Syrians followed suit. Everyone on both sides took up the cry, eager to avoid killing their fellow Muslims - except for the conspirators. The majority of Ali's followers supported arbitration. Nasr b Muzahim, in one of the earliest sources states that al-Ashath ibn Qays, one of Ali's key supporters and a Kufan, then stood up and said: