577 Dyrham: Battle of Lower Severn
After which the Anglo-Saxons took Gloucester, Cirencester and Bath. The battle is a key moment in the Saxon advance, their reaching the Bristol Channel for the first time.
592 Adam's Grave: First Battle of Woden's Barrow
At which the Anglo-Saxon King of Wessex Ceawlin King Wessex was driven out. He may have been fighting the Britons but likely he was fighting Ceol King Wessex, his nephew, who became the next King of Wessex.