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Cissbury Ring is the largest hillfort in Sussex, covering an area of c60 acres. Flint has been mined there since Neolithic times, open mining giving way to the digging of numerous shafts and tunnels. It was used as a burial ground in the Bronze Age and was fortified in the Iron Age, in around 400 BC. It is a univallate fort - one with a single rampart and ditch. The fort was in use for about 300 years, was abandoned, and then resettled in the late Roman period - possibly in defence against Saxon raids. It was fortified again during WW2, when an anti-tank ditch was dug round it, an AA battery based there and, during the run up to D-Day, the Argyll & Sutherland Highlanders were camped there. Now, it's just a pleasant place to walk, with great views over the Downs and nearby coast. If you're lucky, you may spot some wild ponies grazing there.