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Cynwyl Elfed Anti-invasion Defences is a post-medieval and modern defensive site located in Wales, protected by Cadw under reference CM374. The monument comprises earthwork fortifications constructed during periods of heightened threat to British shores, when coastal and inland communities erected defensive barriers against potential enemy invasion. Such defences typically consisted of linear earthworks, gun emplacements and obstacles designed to impede advancing forces across vulnerable terrain.
The site lies upon Ashgill Rocks, undifferentiated mudstone, siltstone and sandstone formations dating to the Ashgill period of the Ordovician epoch. This mixed geology would have presented both challenges and opportunities for construction: the softer mudstones and siltstones offered easier excavation for trenches and gun pits, whilst the sandstone bands provided more stable foundations for defensive structures and emplacements.
The defences reflect the strategic importance placed upon Welsh territory during periods of national defence mobilisation. Such monuments survive across Britain as material evidence of civilian and military preparedness, their earthworks preserving the landscape interventions undertaken by communities responding to genuine security concerns. Cynwyl Elfed's defences remain a tangible record of these protective measures embedded within the Welsh countryside.
Cynwyl Elfed Anti-invasion Defences is a scheduled monument protected by Cadw under reference CM374. View the official record →
Cynwyl Elfed Anti-invasion Defences is a post-medieval and modern defensive site located in Wales, protected by Cadw under reference CM374.
Cynwyl Elfed Anti-invasion Defences dates from the post medieval/modern period, and is classified as a anti invasion defence site. It is one of over 32,000 scheduled monuments protected across the UK.
Cynwyl Elfed 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 CM374.
Several scheduled monuments lie within 10 km, including Pen y Gaer Hillfort (4.3 km), Trebersed Moated Site (7.2 km), Burnt Mound West of Derllys Court (7.2 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Cynwyl Elfed 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.
Cynwyl Elfed Anti-invasion Defences stands on Ashgill Rocks (Undifferentiated), bedrock that formed in the Ashgill. The rock here is mudstone, siltstone and sandstone.