Stack Rock Fort

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Stack Rock Fort

Stack Rock Fort is a fort built on a small island in Milford Haven, Pembrokeshire. A 3-gun fort was built between 1850 and 1852, and then upgraded in 1859 with a new building that completely encased the original gun tower. It is now a Grade II* listed building.[1]


A fortification at Stack Rock was first proposed by Thomas Cromwell in 1539 to protect the waterway, although this would not actually come to fruition at the time. Similar proposals were made in 1748 when Lewis Morris carried out a survey of Milford Haven, reporting on shipwrecks and navigation and recommending that a small fort be built here. Another survey followed in 1817. The Royal Dockyard at Pembroke Dock was felt to be in need of defence from the sea,[2] and in 1850 construction commenced, being completed in 1852.[3]

The fort was originally designed for two decks of artillery casements, but only the first floor was completed and used as a gun deck. The first floor accommodated a garrison of one officer and thirty men.[3] Disarmed in 1929, it was first placed on the market in 1932 and sold for £160.[3] In 2005 it was sold once more for £150,000.[4] Concerns over the security of the site were raised in 2013, following the discovery of potential trespasser activity.[5]

The site[edit]

Originally, the fort housed three 32-pounder guns, as well as a single 12-pounder for protection of the walls of the dock. From 1859 to 1871, the armaments were changed to sixteen 10-inch and seven 9-inch RMLs, and these were changed again to four 12-pounder QF guns in 1902. A small consignment of men manned the fort during World War I and by this time, only two 12-pounder QF guns remained.[2]


  1. ^ "Stack Rock Fort, Herbrandston". British Listed Buildings. Retrieved 1 June 2011. 
  2. ^ a b Alan Phillips (2013). Castles and Fortifications of Wales. Amberley Publishing Limited. p. 109. ISBN 978-1-4456-2484-6. 
  3. ^ a b c Phillips, Benjamin A Pembrokeshire's Forts & Military Airfields 1535–2010, Logaston Press, 2013 ISBN 9781906663735
  4. ^ Island Fort For Sale At £150,000 BBC News Article, 25 June 2005
  5. ^ Stack Rock ‘break-in’ raises LNG safety concerns The Pembrokeshire Herald, 26 August 2013

External links[edit]

Coordinates: 51°42′11″N 5°05′31″W / 51.703°N 5.092°W / 51.703; -5.092