leaders after his victory, but instead Edgar the Ætheling was proclaimed king by the Witenagemot, with the support of Earls Edwin and Morcar, Stigand, the Archbishop of Canterbury, and Ealdred, the Archbishop of York. William therefore advanced on London, marching around the coast of Kent. He defeated an English force that attacked him at Southwark but was unable to storm London Bridge, forcing him to reach the capital by a more circuitous route. William moved up the Thames valley to cross the river at Wallingford, where he received the submission of Stigand. He then travelled north-east along the Chilterns, before advancing towards London from the north-west, fighting further engagements against forces from the city. The English leaders surrendered to William at Berkhamsted, Hertfordshire. William was acclaimed King of England and crowned by Ealdred on 25 December 1066, in Westminster Abbey. Despite the submission of the English nobles, resistance continued for several years. There were rebellions in Exeter in late 1067, an invasion by Harold's sons in mid-1068, and an uprising in Northumbria in 1068. In 1069 William faced more troubles from Northumbrian rebels, an invading Danish fleet, and rebellions in the south and west of England. He ruthlessly put down the various risings, culminating in the Harrying of the North in late 1069 and early 1070 that devastated parts of northern England. A further rebellion in 1070 by Hereward the Wake was also defeated by the king, at Ely. Battle Abbey was founded by William at the site of the battle. According to 12th-century sources, William made a vow to found the abbey, and the high altar of the church was placed at the site where Harold had died. More likely, the foundation was imposed on William by papal legates in 1070. The topography of the battlefield has been altered by subsequent construction work for the abbey, and the slope defended by the English is now much less steep than it was at the time of the battle; the top of the ridge has also been built up and levelled. After the Dissolution of the Monasteries, the abbey's lands passed to secular landowners, who used it as a residence or country house. In 1976 the estate was put up for sale and purchased by the government with the aid of some American donors who wished to honour the 200th anniversary of American independence. The battlefield and abbey grounds are currently