After the defeat of Guthrum at the Battle of Edington, Alfred's reforms to military obligations in Wessex made it increasingly difficult for the Vikings to raid successfully. By 896 the Vikings gave up with some going to East Anglia and others going to Northumbria. It was under Alfred that the Viking threat was contained. However, the system of military reforms and the Burghal Hidage introduced by Edward the Elder enabled Alfred's successors to retake control of the lands occupied in the North of England by the Danes.