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
Alfred the Great Hoards dating to the Viking occupation of London in 871/2 have been excavated at Croydon, Gravesend, and Waterloo Bridge. These finds hint at the cost involved in making peace with the Vikings. For the next five years the Danes occupied other parts of England. In 876 under their new leader, Guthrum, the Danes slipped past the Saxon army and attacked and occupied Wareham in Dorset. Alfred blockaded them but was unable to take Wareham by assault. Accordingly, he negotiated a peace which involved an exchange of hostages and oaths, which the Danes swore on a "holy ring" associated with the