Viking Age by a Viking leader called Bagsecg and his five earls. Aided by the Great Heathen Army (which had already overrun much of England from its base in Jorvik), Bagsecg's forces, and Halfdan's forces (through an alliance), the combined Viking forces raided much of England until 871, when they planned an invasion of Wessex. On 8 January 871, Bagsecg was killed at the Battle of Ashdown along with his earls. As a result, many of the Vikings returned to northern England, where Jorvic had become the centre of the Viking kingdom, but Alfred of Wessex managed to keep them out of
Battle of Tettenhall according to the "Anglo-Saxon Chronicle" defeated them and inflicted losses of many thousands including two or three kings. While little is known of the exact manoeuvres employed at the battle, it is obvious the allies trapped their Viking opponents and inflicted heavy casualties on them. The "Anglo-Saxon Chronicle" states that "many thousands of men" were killed, referring to the Danes. Seemingly unable to retreat, the Kings leading the Viking raid were both killed by the allied troops. With the Northern Danes subdued, the forces of Wessex and Mercia could be focused against those who had settled further south. It was