In April 871, King Ethelred died, and Alfred succeeded to the throne of Wessex and the burden of its defence, despite the fact that Ethelred left two young sons. Although contemporary turmoil meant the accession of Alfred, an adult with military experience and patronage resources, over his nephews went unchallenged, he remained obliged to secure their property rights. While he was busy with the burial ceremonies for his brother, the Danes defeated the English in his absence at an unnamed spot, and then again in his presence at Wilton in May. Following this, peace was made and, for the next five years, the Danes occupied other parts of England. However, in 876, under their new leader, Guthrum, the Danes slipped past the English army and attacked Wareham in Dorset. From there, early in 877, and under the pretext of talks, they moved westwards and took Exeter in Devon. There, Alfred blockaded them, and with a relief fleet having been scattered by a storm, the Danes were forced to submit. They withdrew to Mercia but, in January 878, made a sudden attack on Chippenham, a royal stronghold in which Alfred had been staying over Christmas, "and most of the people they reduced, except the King Alfred, and he with a little band made his way by wood and swamp, and after Easter he made a fort at Athelney, and from that fort kept fighting against the foe."