Gruffudd landed on Anglesey with an Irish force, and with the assistance of troops provided by the Norman Robert of Rhuddlan first defeated and killed Cynwrig ap Rhiwallon, an ally of Trahaearn who held Llŷn, then defeated Trahaearn himself in the battle of Gwaed Erw in Meirionnydd and gained control of Gwynedd.
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The armies of the two confederacies met at the Battle of Mynydd Carn, with Gruffudd and Rhys victorious and Trahaearn, Caradog and Meilyr all being killed.