Shortly after Tany and his men had crossed over a pontoon bridge they had built to the mainland, they were ambushed by the Welsh and suffered heavy losses at the Battle of Moel-y-don.
Kort efter at Tany og hans mænd havde krydset en pontonbro, som de havde bygget, blev de overfaldet af waliserne og led store tab under slaget ved Moel-y-don.