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Portsdown Hill is a long chalk hill in Hampshire, Englandmarker, offering good views over Portsmouthmarker, The Solentmarker, Hayling Islandmarker and Gosportmarker, with the Isle of Wightmarker beyond. The hill is on the mainland, just to the north of Ports Creekmarker, which separates the mainland from Portsea Islandmarker, on which lies the main part of the city of Portsmouth, one of the United Kingdom's main naval bases. To the north lies the forest of Beremarker, with the South Downsmarker marching in the distance. Butser Hillmarker can be seen on a clear day. Southwick Housemarker nestles close by the north side of the hill, the HQ for U.S. General Dwight D. Eisenhower during the D-Day invasions; the generals prayed together before D-Day at Christ Church Portsdown, on the hill, which has a memorial window. The A3 motorway cuts through the east side of the hill while the original A3 climbs over the centre by the "George" pub and Christ Church. The nearest railway stations (from west to east) are Portchestermarker, Coshammarker and Bedhamptonmarker. There are many stories about real and imagined tunnels in the hill . Part of the hill has been designated a Site of Special Scientific Interest.

Portsdown Forts

The forts on Portsdown Hill were built as a result of the 1859 Royal Commission, as part of a series of fortifications built to defend Portsmouthmarker and its dockyardmarker (which is 8 kilometres away) from a possible attack from inland, as the development of rifled gun barrels made it possible for an invading army to land elsewhere, circle around to the top of the hill and bombard the city from there, rendering the existing Hilsea Linesmarker at the bottom of the ridge useless. A series of 6 forts were planned along the 10 km (7 miles) of the ridge. From west to east they are forts Fareham, Wallington, Nelson, Southwick, Widley and Purbrook. The line was finished off at the eastern end with Crookhorn Redoubt and Farlington Redoubt. The main threat was perceived to be from Napoleon III of Francemarker, but this receded soon after the forts' completion. Due to this they became known as "Palmerston's Folly" but, though never needed for their original purpose, were useful anti-aircraft gun emplacements during World War II.

Fort Fareham is now a small industrial estate .

Fort Wallington has been largely demolished to make way for an industrial estate .

Fort Nelsonmarker has been extensively restored as an artillery museum run by the Royal Armouries.

Fort Southwickmarker was for many years an Admiralty Research Establishment, sold in 2003 for housing .

Fort Widley is owned by Portsmouth council, hosting a stable and various community rooms. Tours run on summer weekends.

Fort Purbrook is open occasionally for craft fairs. It is also home to an activity centre which offers (but is not limited to) archery, rifle shooting and indoor rock-climbing.

Guarding Fort Purbrook, the Crookhorn redoubt suffered from subsidence, and was demolished by 1876 . The Farlington redoubt had only the ditches and gun positions dug, and was finally demolished in the 1970s . The tunnel between Crookhorn and Purbrook has recently been rediscovered .


Over fifty hectares of the south face of the Hill are a Site of Special Scientific Interest owing to its chalk grassland habitat. Grazing ceased in the early 1950s, and consequently the site was gradually invaded by scrub, mostly hawthorn, dogwood, and wild privet. An intensive restoration programme funded by the Countryside Commission and Portsmouth City Councilmarker was initiated in 1995; large areas of scrub have now been cleared by machine, and flowers and grasses allowed to regenerate naturally. Scrub re-encroachment is controlled by cattle and horses which graze overwinter.

Several species of butterfly became extinct owing to the loss of habitat to scrub, notably the Adonis Blue, Silver-studded Blue, Dingy Skipper, and Dark Green Fritillary. Others such as the Chalkhill Blue and Small Blue were at the brink of extinction, but are now flourishing again. Indeed, the hill has now probably the largest matapopulation of the Small Blue in the UK.

Portsdown also gave its name to an Army estate in Singapore. Long after the British army moved out (1967) the Portsdown estate continues to thrive, with Portsdown Rd the main road running through the middle.

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