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Three Palmerstonian Gun Batteries, Flat Holm is a post-medieval defence installation located on Flat Holm Island in the Bristol Channel, Wales. The batteries were constructed during the mid-19th century as part of the Palmerston fortification programme, a systematic defensive scheme implemented across the British Isles in response to perceived French naval threats during the 1860s. The installation comprises three separate gun battery positions designed to provide overlapping fields of fire for coastal defence. The structures represent the characteristic engineering of Victorian-era coastal fortification, employing the standardised Palmerston design principles that characterised this significant period of British defensive modernisation.
Three Palmerstonian Gun Batteries, Flat Holm is a scheduled monument protected by Cadw under reference GM351. View the official record →
Three Palmerstonian Gun Batteries, Flat Holm is a post-medieval defence installation located on Flat Holm Island in the Bristol Channel, Wales. It is designated a Scheduled Ancient Monument by Cadw under reference GM351.
Three Palmerstonian Gun Batteries, Flat Holm dates from the post medieval/modern period, and is classified as a battery. It is one of over 32,000 scheduled monuments protected across Britain.
Three Palmerstonian Gun Batteries, Flat Holm is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is GM351.
Several scheduled monuments lie within 10 km, including Flat Holm Coastal and Anti-aircraft Defences (0.1 km), Flat Holm Victorian Rain Water Catchment (0.1 km), Flat Holm Victorian Rock Cut Defensive Ditch and Rampart (0.1 km).
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