The Fort on the Hilltop at Devil's Dyke

The Fort on the Hilltop at Devil's Dyke

The Devil was angry at the conversion of Sussex, one of the last counties to be converted from Paganism, and especially at the way churches were being built in every Sussex village. So he decided to dig right through the South Downs, a range of hills along the south of Britain. He swore that he would dig all the way through the hills to let the sea flood Sussex in a single night and drown the new Christians. He started inland near the village of Poynings and dug furiously sending huge clods of earth everywhere. One became Chanctonbury hill, another Cissbury hill, another Rackham Hill and yet another Mount Caburn.

Towards midnight, the noise he was making disturbed an old woman, who looked out to see what was happening. When she realized what the Devil was doing, she lit a candle and set it on her windowsill, holding up a metal sieve in front of it to create a dimly glowing globe. The Devil could barely believe that the sun had already risen, but the old woman had woken her rooster who let out a loud crowing and Satan fled believing that the morning had already come. Some say, that as he fled out over the English Channel, a great lump of earth fell from his cloven hoof, and that became the Isle of Wight; others say that he bounded northwards into Surrey, where his heavy landing formed the hollow called the Devil's Punch Bowl.

Devil's Dyke is a V-shaped valley on the South Downs Way in southern England, near Brighton and Hove. It is part of the Southern England Chalk Formation. Devil's Dyke is on the way to Brighton and is a big hill at the side of the road. It is a misconception common amongst local residents of Brighton that the valley was formed by some kind of glacial action, the myth of a 'glacier' being a misunderstanding of accounts such as this one from the Encyclopaedia of Brighton by Timothy Carder (1990):
 "In reality the 300-foot-deep valley was carved by tremendous amounts of water running off the Downs during the last Ice Age when large amounts of snow thawed and the frozen chalk prevented any further absorption; erosion was aided by the freeze-thaw cycle and the valley was deepened by the 'sludging' of the saturated chalk."
The Devil's Dyke V-shaped dry valley is the result of solifluction and river erosion. More than fourteen thousand years ago, the area experienced an intensely cold climate (but not glacial conditions). Snowfields capped the South Downs. Permafrost conditions meant that the chalk was permanently frozen. In summer, the snowfields melted and saturated the top layer of soil, because the water could not permeate the frozen chalk underneath. Waterlogged material situated above the permafrost slid down the gradient, removing material by friction, exposing deeper layers of frozen chalk. When the Ice Age ended, the snowfields covering the South Downs melted, and rivers formed across Sussex. The Devil's Dyke valley was completed by one such river.
The hills surrounding the valley offer views of the South Downs, The Weald, and – on a clear day – the Isle of Wight. It is the site of ramparts, all that remain of an Iron Age hillfort.