In 655 he was attacked by Penda, and, after an unsuccessful attempt to buy him off, defeated and slew the Mercian king at the battle of the Winwaed.
In 654 Anna was slain by Penda of Mercia, and was succeeded by his brother 2Ethelhere, who was killed in 655 at the Winwaed, fighting for the Mercian king against Oswio of Northumbria.
In 654 or 655 he invaded Northumbria in spite of the attempts of Oswio to buy him off, and was defeated and slain on the banks of the "Winwaed."
He was defeated and slain, however, by Oswio, at a river called the Winwaed.
Moreover, Penda was no sooner dead, smitten down by Oswalds brother Oswio at the battle of the Winwaed (A.D.