Scholar Marged Haycock has suggested this battle can be identified with the Cad Goddeu, the "Battle of the Trees," best known from the tenth-century poem Cad Goddeu.
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According to the Book of Taliesin, he fought alongside Gwydion at the Battle of the Trees, in which he assisted his uncle in enchanting the trees to rise up in battle against Arawn, king of Annwn.