Thorne Island
small island in Wales dominated by a Palmerston Fort
Thorne Island is a rocky islet and part of the community of Angle, Pembrokeshire, Wales, with an area of 2 acres (8,100 m2), dominated by a coastal artillery fort built to defend the Milford Haven Waterway in the mid-19th century. It has been the site of a number of shipwrecks, including one in 1894 that was carrying a cargo of Scotch whisky.
History
Fortification
Thorne Island commands the entrance to the anchorage of Milford Haven and access to the former Royal Dockyard at Pembroke Dock. A proposal was made to fortify the island in 1817, but it was not implemented. In the 1850s, there was growing concern about the increasing strength of the French Navy since the French invaded Fishguard in north Pembrokeshire and controlled it for 3 days.and the expansionist policy of the Emperor Napoleon III. Work started on the existing fort at some time after 1852 and '1854' is carved above the entrance.
The fort is an irregular polygon in plan and was designed with a seaward facing battery for five RBL 7-inch Armstrong guns and four 68-pounder guns, all mounted en barbette (i.e. in an open mounting, firing over a parapet). The landward side of the fort consists of a defensible barracks, with a loopholed parapet overlooking the entrance.
In 1860, the report of the Royal Commission on the Defence of the United Kingdom commented that "Although these batteries [ie: Thorne Island Fort, Dale Fort and West Blockhouse Fort] would prevent an enemy from making use of the anchorage at the mouth of Milford Haven, they would not prevent the passage of steamers of war, and therefore would not suffice to protect the dockyard or the haven itself." This was due to the limited number and size of guns that the existing fort could bring to bear on any fast moving target. The report recommended to Lord Palmerston that further forts should be strengthened or constructed to counter the potential threat of the French Navy.
Begin with the source’s own compact description: “Thorne Island” is small island in Wales dominated by a Palmerston Fort. The dossier treats that line as a proposition to test through Thorne, Island and small, not as a finished interpretation.
Why this record matters
The phrase “small island in Wales dominated by a Palmerston Fort” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Jul 31, 2026. The linked authority identifier is Q7796288. Authority coordinates are 51.692, -5.118. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1894, 1817, 1852 and 1854.
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This entry incorporates text from “Thorne Island” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.