Æthelred of Wessex of Mercia, appealed to him for help against the Vikings. Æthelred and his brother, the future Alfred the Great, led a West Saxon army to Nottingham, but there was no decisive battle, and Burgred bought off the Vikings. In 874 the Vikings defeated Burgred and drove him into exile. In 870 the Vikings turned their attention to Wessex, and on 4 January 871 at the Battle of Reading, Æthelred suffered a heavy defeat. Although he was able to re-form his army in time to win a victory at the Battle of Ashdown, he suffered further defeats on 22 January at
Battle of Ashdown the surrounding countryside. Alfred reputedly took his favourite white mare and rode up onto Blowingstone Hill (near Kingston Lisle), where stood an ancient perforated sarsen stone, called the "Blowing Stone". Anyone with the appropriate skill could generate a booming sound from this stone, by blowing into one of its holes. Alfred took a deep breath and was able to sound the alarm across the downs. All over the surrounding country, men were woken and gathered to defend their homes. In late 870, King Ethelred led the army of Wessex against the Danes in their stronghold at Reading. The attack failed,