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Storey Arms Anti-invasion Defences is a post-medieval infantry support trench located in Wales, protected by Cadw under reference BR337. Constructed in response to the threat of invasion during the Second World War, the trench represents a significant phase in Britain's coastal and inland defensive strategy. The site exemplifies the rapid mobilisation of labour and resources to fortify the Welsh landscape against potential enemy assault.
The defences are situated on Lower Devonian bedrock, a foundation of sandstone and conglomerate laid down in the Early Devonian period. This ancient geology, exposed across the Welsh uplands, presented both challenges and advantages for the trench diggers. The interbedded rock layers would have required considerable effort to excavate, yet the same geological structure provided stable ground for the construction of effective defensive positions.
Infantry support trenches of this period typically incorporated firing steps, communication trenches and reinforced positions designed to resist small-arms fire and support forward defence lines. The Storey Arms defences form part of the extensive network of anti-invasion works constructed across Britain during the early 1940s, reflecting the urgency of national defence during wartime. Today, the site survives as a physical record of this pivotal historical period.
Storey Arms Anti-invasion Defences is a scheduled monument protected by Cadw under reference BR337. View the official record →
Storey Arms Anti-invasion Defences is a post-medieval infantry support trench located in Wales, protected by Cadw under reference BR337.
Storey Arms Anti-invasion Defences dates from the post medieval/modern period, and is classified as a infantry support trench. It is one of over 32,000 scheduled monuments protected across the UK.
Storey Arms Anti-invasion Defences 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 BR337.
Several scheduled monuments lie within 10 km, including Nant-Maden Round Cairn (9.1 km), Cefn Sychbant Round Cairns (9.2 km), Cefn Sychbant, round cairns to the S of (9.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Storey Arms Anti-invasion Defences's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Storey Arms Anti-invasion Defences stands on Lower Devonian Rocks (Undifferentiated), bedrock that formed in the Early Devonian. The rock here is sandstone and conglomerate, interbedded.