Flat Holm Island

Flat Holm Walk, Sully, Penarth, UK
Posted on October 14, 2022 / 1
Listing Type : Defence Line
Location : England

Flat Holme Island forms part of the line of defence that lay across the Bristol Channel.  Flat Holm was supported by Steep  Holm Island and Lavernock Battery on the Welsh Mainland.

The four batteries on the Island were built between 1866 and 1871.  A total of nine 7-inch RML guns were mounted in four batteries.  All the guns were on Moncrieff Counterweight Pattern I Mounts, unlike Steep Holm where they were all on barbette mounts.  The Batteries were:

Castle Rock Battery with three 7-inch RML guns in disappearing pits

Farm House Battery with two 7-inch RML guns in disappearing pits

Well Battery with one 7-inch RML gun in a disappearing pit

Lighthouse Battery with three 7-inch RML guns in disappearing pits.

During World War 2 Flat Holm was used to mount four 4.5-inch dual purpose guns and other anti-aircraft assets.  A Radar was also mounted on the Island.

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