This appears to be an Iron Age fortification but is far away from any hill or other vantage point. It is, nonetheless, larger than its counterpart, Uffington Castle, on the nearby Berkshire Downs. The surrounding area was likely to have been marshy, so the site may have had strategic importance. In structure and unusual siting, it resembles nearby Hardwell Castle. An archaeological excavation was carried out at Cherbury camp in the late 1930s. The report on this was published in Oxoniensia vol.5, and is available online at