Ecgberht had devastated Cornish territory in 815 and in the autumn of 825 he was again campaigning against the Britons, at Gafulford.
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While the precise period during which the Mercian Supremacy existed remains uncertain (depending upon whether the reigns of Penda and Wulfhere are included), the end of the era is generally agreed to be around 825, following the defeat of King Beornwulf at the Battle of Ellandun, (near the present Swindon).
It must have been with a high degree of confidence, therefore, that, in 825, Beornwulf marched against the West Saxon’s, but was badly defeated at the battle of Ellandun at the hands of their king Egbert, fought at present day Wroughton near Swindon, Wiltshire.