The Siege of Athelney occurred in 1066 when the Norman army of Duke William the Conqueror besieged and captured the Anglo-Saxon stronghold of Athelney in Somerset, England amid the Norman conquest of England. William's deputy, William FitzOsbern, marched from Wilton, Wiltshire to lay siege to the fortified city of Athelney, the main Saxon outpost in the region, and the 1,498-strong Norman army faced a 1,020-strong garrison. The Normans built siege works and assaulted the city with several battering rams, taking it by storm with 286 losses.