 The Annals of Innisfallen are alone in reporting an expedition by Cerbthe power of all with allies from Munster against Máel Sechnaill in 859, which is said to have reached as far north as Armagh.The Annals of Ulster however, states that Cerball entered Mide with a great army, supported by Norse allies, Amlaíb and "Ivar".A general assembly of kings and clerics in 859 at Rahugh in County Westmeath settled matters by detaching Osraige from Munster.