Military History | Fort Purbrook, Portsdown Hill — Little Altered, Never Used

Portsmouth City Council bought Fort Purbrook in 1969. The Victorian Forts datasheet, drawing on a single published study, gives the sequence that led there: army barracks, then naval radar training to 1968, then the sale.

The fort holds the east end of the Palmerston line on Portsdown Hill, the chalk ridge behind Portsmouth Harbour. Historic England's Havant listing calls it "the easternmost of a series of Palmerston forts (of the 1860's) which ring the Portsmouth naval base at a distance of 3 to 5 miles", and closes on a flat sentence: "Little altered, and never used as a defence from a landward assault from the north."

That same datasheet records the work commenced in 1862 and completed in 1870, at £135,000 against £78,649 for Fort Nelson along the ridge, with barrack accommodation for 227. Its underground passages are the only ones in the Portsmouth defences fitted with chicanes. Two outposts, Crookhorn and Farlington redoubts, went up because the eastern flank was judged weak.

In 1983 a charity chaired by Peter Ashley took the fort on a twenty-one-year lease from the council. Fort Widley was added in 1990, and in 1993 the two were renamed the Peter Ashley Activity Centres. The parade ground now carries archery, bouldering and an assault course; the operator advertises no standing public opening and the fort is not a museum.

Two authorities' boundaries cross the work, so Historic England lists it twice, Grade II* each time, and schedules it besides. The Heritage at Risk register carries it at condition Poor, priority C: slow decay, no solution agreed.

📸 Cover: the fort from the air, looking north across the V-shaped barrack block and the parade ground in its present use. Photograph by TimSC (Tim Sheerman-Chase), 19 November 2021, CC BY-SA 4.0 via Wikimedia Commons. Second image, the ditch wall under ivy and self-seeded trees with pallets stacked at its foot; by Simon Burchell, 2 May 2019, CC BY-SA 4.0.