Great Heathen Army Anglia and spent the winter of 869–70 at Thetford. There was no peace agreement between the East Anglians and the Vikings this time. When the local king Edmund fought against the invaders, he was captured and killed. In 871, the Great Summer Army arrived from Scandinavia, led by Bagsecg. The reinforced Viking army turned its attention to Wessex, but the West Saxons, led by King Æthelred's brother Alfred, defeated them on 8 January 871 at the Battle of Ashdown, slaying Bagsecg in the process. Three months later, Æthelred died and was succeeded by Alfred (later known as Alfred the Great),
Alfred the Great 22 January. They were defeated again on 22 March at the Battle of Merton (perhaps Marden in Wiltshire or Martin in Dorset). Æthelred died shortly afterwards on 23 April. In April 871 King Æthelred died and Alfred succeeded to the throne of Wessex and the burden of its defence, even though Æthelred left two under-age sons, Æthelhelm and Æthelwold. This was in accordance with the agreement that Æthelred and Alfred had made earlier that year in an assembly at "Swinbeorg". The brothers had agreed that whichever of them outlived the other would inherit the personal property that King Æthelwulf had