The Dál nAraidi became involved in civil war during his reign and in 776 they fought a battle amongst themselves at the battle of Sliabh Mis (Slemish mountain). That same year they engaged in another battle, the battle of Drong, where the opposing sides sought the assistance of their neighbours. Cináed and his ally, Dúngal king of the Uí Tuirtri, were slain by Tommaltach mac Indrechtaig (died 790) and his ally Eochaid mac Fiachnai (died 810) of the Dál Fiatach.