Cam’s Hill is an isolated ringwork located on a hilltop close to the town of Malmesbury, Wiltshire. Just less than one hectare of pastoral farmland was subject to earth resistance and topographic survey, including the Scheduled Monument and the surrounding landscape to the north and east. Earthwork analysis indicated two distinct phases and revealed that the monument stands at the head of a small spring that flows to the north. Earth resistance survey identified a number of anomalies which may represent activity both at the entranceway and within the interior of the ringwork. Located in a good strategic position overlooking the River Avon, it may be tentatively suggested that Cam’s Hill was constructed or utilised as a siegework in the mid-twelfth century, perhaps during a documented siege of 1144 when a number of castles were built in the landscape around Malmesbury.