Battle of Edington Guthrum, with two other unnamed kings, "departed for Cambridge in East Anglia". He made several attacks on Wessex, starting in 875, and in the last nearly captured Alfred in his winter fortress at Chippenham. By 878, the Danes held the east and northeast of England, and their defeat at the Battle of Ashdown had paused but not halted their advance. Alfred the Great had spent the winter preceding the Battle of Edington in the Somerset marsh of Athelney, the nature of the country giving him some protection. In the spring of 878, he summoned his West Saxon forces and marched
Halfdan Ragnarsson led by Bagsecg, bolstering the ranks of Halfdan's army. According to the "Anglo-Saxon Chronicle", the Danes battled the West Saxons nine times, including the Battle of Ashdown on 8 January 871. However, the West Saxons could not be defeated, and Halfdan accepted a truce from Alfred, newly crowned king of Wessex. The Army retreated to the captured town of London and stayed there over the winter of 871/872. Coins minted in London during this period bear the name Halfdan, identifying him as the leader of the army. In autumn of 872 the Army returned to Northumbria to quell a revolt