Original battery (1853-1863)

The first fortifications on Gilkicker Point were constructed as an auxiliary battery to Fort Monckton and consisted of an earthen rampart for eleven guns firing through embrasures cut through the parapets. The battery was a distorted quadrilateral in shape with a long gorge (or rear) a short sea facing rampart with two flanking faces. The front faces were protected by a ditch which was flanked by musketry caponiers at the angles. The rear was closed off by a brick wall with a barrack for officers at its centre.^[2] The battery was heavily criticised by James Fergusson, who eventually became the Treasury representative on the Royal Commission in to the defences of the United Kingdom, set up in 1859. In his paper ‘The Peril of Portsmouth’^[3] he stated that the battery was in danger of collapse under the weight of its own guns and could easily be captured by a small force landing in the bay as it could offer little resistance. As a result, the Defence Committee proposed a new work to replace it.

Construction (1863-1871)

The current Fort Gilkicker was constructed between the years 1863 and 1869 at Stokes Bay, Gosport. Its purpose was to defend the deep water anchorage at Spithead and to protect the western approach to Portsmouth harbour. The fort was begun by a contractor who failed in November 1863 early in the stages of the construction and a renowned civil engineer, John Towlerton Leather who was already involved in the construction of the great sea forts at nearby Spithead, was asked to complete the Fort at Gilkicker. His yard was nearby at Stokes Bay, the site of which eventually became the Stokes Bay Submarine Mining Establishment. The new Fort Gilkicker was conceived as a curvilinier fort for twenty six guns on one level firing through armoured embrasures with a barrack closing the rear.^[4] It faced in a more easterly direction that its predecessor and its principal role was to direct fire on Sturbridge Shoal and to the flanks were to bear upon Spithead and Stokes Bay. The design for the fort was altered slightly and it was completed in 1871 for twenty two guns in casemates with five heavier guns in open positions on the roof. The estimated cost of Fort Gilkicker in 1869 was £61,395, the actual cost on completion being £58,766.

First version (1871-1906)

The approved armament was:- seventeen 10-inch R.M.L. 18 tons Lower tier casemates; five 9-inch R.M.L. 12 tons Lower tier casemates. Five gun positions were constructed in the upper battery, three for 11-inch guns of 25 tons on ‘C’ pivots in positions 2, 3 and 4 and two for 12-inch guns of 25 tons on ‘A’ pivots in positions 1 and 5. The site was used for milita training in 1871, and submarine mining experiments in 1879. Additional guns were added through the 1880s.^[5] In 1891 two of the positions for 11-inch guns on the roof were altered as lookout and the guns removed.^[6]

Second version (1906-1956)

Plan of Fort Gilkicker in 1906 showing the final breech loading armament

In 1898 Colonel Montgomery ^[7] recommended that Gilkicker be modified to take the latest Breech Loading guns in place of the 10-inch and 9-inch RMLs on the lower gun floor. The upper battery was to be completely remodelled to take two of the latest 9.2-inch BL Mark X guns on barbette V mountings with two 6-inch BL Mark VII guns on CPII mountings for closer range support. The 9.2-inch BL was to counter Armoured ships up to a range of 6,000 yards whilst the 6-inch BL was for use against unarmoured ships, ships attempting to block channels by sinking in them and against ships trying to break through booms (blockers and boom smashers). The authority for the alteration was given in 1902.^[8] The work was completed in October 1906 at an estimated cost of £16,000 and an actual cost of £19,671. The contractor was William Hill of Gosport. The work included the rebuilding of the magazines, gun emplacements and barrack block. The magazines were altered to accommodate 1000 6-inch B.L. shells and cartridges and 500 9.2-inch BL shells and 1,000 cartridges.^[9] As part of this work the whole of the exterior granite wall of the fort was covered with earth and the front ditch filed to protect the shell and cartridge stores. Position finding cells were built into this bank at each end of the fort. each worked in conjunction with a transmitting station exterior to the fort, that for the 6-inch guns at Fort Monckton and that for the 9.2inch guns at No.4 battery of the Stokes Bay Lines.

The Owen Committee decided in 1905^[10] that the heavy armament of Gilkicker, Stokes Bay and Browndown were only of use against ships that had forced the outer defences and such ships would be deterred by the inevitable damage they would incur. The 9.2-inch guns at Gilkicker and Browndown were therefore superfluous. The 6-inch guns at Gilkicker and at No.2 battery of the Stokes Bay Lines were also superfluous and ineffective. These guns were to be removed. A 1906 armament return shows that the 9.2 inch and 6-inch guns were still mounted but to be reduced. Corrections to August 1907 show them as dismounted. The barrack block was altered 1908-1910 by converting it to married quarters for Royal Engineers at nearby Fort Monckton. In 1916 the fort was armed with an early type of Anti-Aircraft gun, a 3-inch Quick Fire gun on a high angle mounting. This was placed in the eastern 9.2inch B.L. position on top of the fort. Trinity House had a small observation post on Fort Gilkicker after 1939.

During World War II the fort was briefly armed with a 40mm Bofors gun and Gun Laying Radar was fitted outside the fort to direct the guns of the nearby Gilkicker Anti-Aircraft gun site. In the build-up to D-day a signals unit occupied the fort and during the Normandy landings on 9 June over 1,000 signals were recorded for the day needing routing to over 1300 addresses. Later an average of 800 signals to almost 1,000 addresses were routed via Gilkicker.^[11] The fort was the site of artillery exercises in 1953.

Later use (1956-1999)

In 1956 Coast Defence was abolished and the fort was then used by the Ministry of Public Buildings and Works as a plumbers workshop. Later a substantial wooden signalling station was built on top of the fort, which was continuously manned by former RN Signalmen, and used to monitor movements of vessels and assist in RN signalling training. Vessels transiting The Solent in the vicinity could also check their compass errors using the nearby navigational transit towers of Gilkicker and Kickergil. The fort was used by HMS Dolphin, based at Fort Blockhouse as storage for Submarine spares from 1959, with Fort Brockhurst staff maintaining it. The adjacent beach was closed to the public during this period.

In November 1986 Hampshire County Council bought the fort, but not its surrounding earth bank. The fort was used as a building materials store from 1987 until 1999.^[12]

Disuse (1999-present)

The main entrance

The Phoenix Trust proposed to convert the fort to apartments in 1999, but pulled out in 2001. A similar redevelopment scheme was posited by Try Homes from 2003 to 2006, and Assett Hawk from 2007 to 2012. The latter did engage in some work on the site clearing overgrowth in 2012, but none of the schemes came to fruition.^[13] In 2016, the fort was earmarked for restoration and conversion to modern apartments by Fort Gilkicker Developments Ltd, and work began on site with the erection of a fence, however these plans were again dropped in 2018 due to financial issues,^[14] and the fort was put on sale again in November 2019 with a guide price of 5 to 5.5 million pounds.^[15][16]

On 28 July 2022, it was sold to developers for £1.38 million, with plans to turn it into 26 homes - 22 in the former gun emplacements and 4 larger ones in the barrack block.^[17]

It is a Grade II* Listed Building and on the Buildings at Risk Register,^[18] but is currently in extremely poor condition due to a lack of maintenance and numerous break-ins. An urban explorer took a series of photographs of the interior in 2016, demonstrating the scale of the damage. The site suffered a major fire in March 2019.^[19]