Battle of the Conwy In 877 they partitioned Mercia, taking the east for themselves and leaving the west to Ceolwulf. Gwynedd was also under attack from the Vikings, and in 877 King Rhodri Mawr was defeated and driven out. He returned the following year, but immediately came under attack from Mercia, which was still trying to maintain its hegemony in Wales. King Alfred's victory over the Vikings at the Battle of Edington in May 878 relieved the pressure on Mercia, and in the same year Mercia defeated and killed Rhodri Mawr. Ceolwulf died or was deposed in 879, and he was succeeded as Lord
Battle of Ashdown and the Anglo-Saxons were forced to retreat while the Danes pursued. The Danish armies caught up with the Anglo-Saxons on the field of Ashdown, located somewhere near the border of Oxfordshire and Berkshire (the precise location is unknown). It was January 8, 871. The weather was cold and damp, and the Berkshire Downs were soaked and boggy. King Ethelred divided his army in two, positioning the halves on either side of a ridgeway. Ethelred commanded one side, Alfred the other. As the Danes approached, they also split their army. Alfred watched as the Danes drew nearer, waiting for the order