The

Palmerston Forts The Palmerston Forts are a group of forts and associated structures around the coasts of the United Kingdom and Ireland. The forts were built during the Victorian period on the recommendations of the 1860 Royal Commission on the Defence of the ...

that encircle

Portsmouth Portsmouth ( ) is a port and city in the ceremonial county of Hampshire in southern England. The city of Portsmouth has been a unitary authority since 1 April 1997 and is administered by Portsmouth City Council. Portsmouth is the most dens ...

were built in response to the 1859 Royal Commission dealing with the perceived threat of a French invasion. The forts were intended to defend the

Dockyard A shipyard, also called a dockyard or boatyard, is a place where ships are built and repaired. These can be yachts, military vessels, cruise liners or other cargo or passenger ships. Dockyards are sometimes more associated with maintenance ...

in Portsmouth. Construction was carried out by the Royal Engineers and civilian contractors (under Royal Engineer supervision). In addition to the newly constructed forts, extensive work was carried out on existing fortifications. The Portsmouth defences can be split into four distinct groups of forts, comprising four sea forts built in the

Solent The Solent ( ) is a strait between the Isle of Wight and Great Britain. It is about long and varies in width between , although the Hurst Spit which projects into the Solent narrows the sea crossing between Hurst Castle and Colwell Bay t ...

, a group of forts on

Portsea Island Portsea Island is a flat and low-lying natural island in area, just off the southern coast of Hampshire in England. Portsea Island contains the majority of the city of Portsmouth. Portsea Island has the third-largest population of all th ...

, a group of forts along

Portsdown Hill Portsdown Hill is a long chalk ridge in Hampshire, England. The highest point of the hill lies within Fort Southwick at 131m above sea level. The ridge offers good views to the south over Portsmouth, the Solent, Hayling Island and Gosport, wit ...

overlooking Portsmouth, and a group of forts on the Gosport peninsula. As well as these forts surrounding Portsmouth, further protection for Portsmouth was provided by additional Palmerston forts on the Isle of Wight.

Solent forts

These man-made island forts were originally built to protect the eastern approaches to

Portsmouth Harbour Portsmouth Harbour is a biological Site of Special Scientific Interest between Portsmouth and Gosport in Hampshire. It is a Ramsar site and a Special Protection Area. It is a large natural harbour in Hampshire, England. Geographically it ...

from attack by enemy forces. The four armour-plated forts were designed by Captain E. H. Stewart, overseen by Assistant Inspector General of Fortifications, Colonel W. F. D. Jervois. Construction took place between 1865 and 1880, at a total cost of £1,177,805. By the time the forts had been completed, the threat of invasion had long since passed and although the forts were armed and re-armed as technology advanced, they were never used in anger. They were decommissioned in 1956 and put up for sale in the 1960s, although they were not sold until the 1980s. The subsequent purchaser, in 2012, was Clarenco (previously known as Amazing Retreats), operated by Michael Clare. His plan was for two of the forts to be converted into hotels and one into a museum. The restoration was completed for Spitbank Fort and No Man's Land Fort, both hotels at the time, but not for Horse Sand Fort. In 2020, the three were listed for sale.Live in your choice of Victorian sea forts, from a boutique delight with helipad to a crumbling wreck that’s a blank canvas
/ref> * Spitbank Fort * St Helens Fort * Horse Sand Fort *

No Man's Land Fort No Man's Land Fort, also referred to as No Man's Fort, is a sea fort in the Solent, near Portsmouth, England. It is one of the Palmerston Forts built between 1867 and 1880 after the recommendations of the 1859 Royal Commission. It is 200 ...

Portsea Island forts

These forts are situated on

, the low-lying island on which most of the city of Portsmouth is located. None of the forts were originally built as a result of the 1859 Royal Commission, but they did receive improvements because of it. *

Fort Cumberland A fortification is a military construction or building designed for the defense of territories in warfare, and is also used to establish rule in a region during peacetime. The term is derived from Latin ''fortis'' ("strong") and ''facere'' ...

* Eastney Batteries * Lumps Fort *

Southsea Castle Southsea Castle, historically also known as Chaderton Castle, South Castle and Portsea Castle, is an artillery fort originally constructed by Henry VIII on Portsea Island, Hampshire, in 1544. It formed part of the King's Device programme to p ...

Point Battery Point Battery (which is also known by its earlier name, Eighteen Gun Battery) is a former gun emplacement on Portsmouth Point in Hampshire. Part of the fortifications of Portsmouth, it was built alongside an earlier defensive structure (the 15th ...

Hilsea Lines The Hilsea Lines are a line of 18th- and 19th-century fortifications built at Hilsea to protect the northern approach to Portsea Island, an island off the southern coast of England which forms the majority of the city of Portsmouth and its key nav ...

Portsdown Hill forts

These forts are located along

overlooking Portsmouth, and were a response to advancing weapons technology. This new technology made it possible for shelling accurate over a number of miles to take place. The forts were intended to prevent a hostile force landing further along the coast, approaching Portsmouth from the mainland, taking the tactical high ground to the north of the dockyard. As such, the forts are designed so that all of their main weapons face inland, protecting Portsmouth from the rest of England. *

Fort Wallington Wallington is a village in Hampshire, part of the borough of Fareham. It is situated between Portsmouth and Southampton near where the River Wallington enters Portsmouth Harbour. The name Wallington probably means 'settlement of the Welsh' (or ...

Fort Nelson, Portsmouth Fort Nelson, in the civil parish of Boarhunt in the English county of Hampshire, is one of five defensive forts built on the summit of Portsdown Hill in the 1860s, overlooking the important naval base of Portsmouth. It is now part of the Royal A ...

Fort Southwick Fort Southwick is one of the forts found on Portsdown Hill, which overlooks the naval base of Portsmouth in the county of Hampshire, England. History Fort Southwick was built to defend the landward approaches to the naval base on the recommenda ...

Fort Widley Fort Widley is one of the forts built on top of Portsdown Hill between 1860 and 1868 on the recommendation of the Royal Commission on the Defence of the United Kingdom. It was designed, along with the other Palmerston Forts atop Portsdown, to pr ...

Fort Purbrook Portsdown Hill is a long chalk ridge in Hampshire, England. The highest point of the hill lies within Fort Southwick at 131m above sea level. The ridge offers good views to the south over Portsmouth, the Solent, Hayling Island and Gosport, wit ...

Crookhorn Redoubt Portsdown Hill is a long chalk ridge in Hampshire, England. The highest point of the hill lies within Fort Southwick at 131m above sea level. The ridge offers good views to the south over Portsmouth, the Solent, Hayling Island and Gosport, wi ...

* Farlington Redoubt

Gosport forts

These are situated on the Gosport peninsula. Again, they were built to prevent an enemy force landing along the coast and approaching Portsmouth from inland, and had their main weaponry facing away from Portsmouth. *

Fort Monckton Fort Monckton is a historic military fort on the south-east shoreline of the Gosport peninsula, Hampshire. Built on the ruins of Haselworth Castle to protect Portsmouth Harbour at the start of the American War of Independence, it was rebuilt in ...

Fort Gilkicker Fort Gilkicker is a historic Palmerston fort built at the eastern end of Stokes Bay, Gosport, Hampshire England to dominate the key anchorage of Spithead. It was erected between 1863 and 1871 as a semi-circular arc with 22 casemates, to be ...

* Stokes Bay Lines * Browndown Battery * Fort Fareham *

Fort Gomer Fort Gomer was one of the Palmerston Forts, in Gosport, England, the southernmost and first-built Polygonal fort in the defence line to the west of Gosport. It was located on land immediately to the west of the present Gomer Lane. Fort Gomer was ...

Fort Grange Fort Grange is one of the Palmerston Forts, in Gosport, England. After Gomer and Elson forts had been approved in 1852, further consideration led to a decision to fill the gap between them by three more forts, and Grange is the most southerly of ...

Fort Rowner Fort Rowner is one of the Palmerston Forts, in Gosport, England. Built circa 1858 as part of the outer defence line for Gosport along with Fort Brockhurst and Fort Elson to the North East and Fort Grange and Fort Gomer to the South West. The for ...

Fort Brockhurst Fort Brockhurst is one of the Palmerston Forts, in Gosport, England, and a Scheduled Ancient Monument. It is now an English Heritage property. History Construction, 1858–1862 Fort Brockhurst was designed by William Crossman in the 19th ce ...

Fort Elson Fort Elson was one of the early Palmerston Forts, in Gosport, England, the northernmost polygonal land fort in the defence line to the west of Gosport. It was located on land immediately to the south of Elson Creek, to which it was connected by ...

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