section_path: Caliphate/Battle of Siffin/Account of the battle
section_name: Account of the battle
paragraph_text: Account of the battle
  
  In the summer of 657, the armies of Ali and Mu'awiya camped at Siffin, west of the Euphrates River, numbering perhaps at 100,000 and 130,000, respectively. Many of Muhammad's companions were present in Ali's army, whereas Mu'awiya could only boast a handful. The two sides negotiated for a while, to no avail, after which the main battle took place from Wednesday, 26 July 657, until Friday or Saturday morning. Ali probably refrained from initiating hostilities, and later fought alongside his men on the frontline, whereas Mu'awiya led from his pavilion, and rejected a proposal to settle the matters in a personal duel with Ali. Among those killed fighting for Ali was Ammar. In canonical Sunni sources, a prophetic hadith predicts Ammar's death at the hands of al-fi'a al-baghiya (lit. ' rebellious aggressive group ') who call to hellfire.