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 Basra (871) placed the city under virtual siege, harassing it with attacks day and night and destroying the surrounding villages. They also cut off the supply routes to the city, which soon resulted in a shortage of resources. This was temporarily relieved after Mansur ibn Ja'far began organizing armed escorts for supply ships; by mid-871, however, the operation of the convoys had largely fallen apart and supplies for the inhabitants again became scarce. Hunger and disease broke out, and fighting erupted between the city factions. By late August 871, 'Ali ibn Muhammad decided that Basra had been reduced to the point where