© Mapbox · © OpenStreetMap contributors · Boundary data © Cadw
Ty Cwm Tawel Anti-invasion Defences is a post-medieval defensive site protecting a strategic position in Wales. Built in response to the perceived threat of foreign invasion, the defences represent the military engineering response of their period to coastal vulnerability. The structures occupy land underlain by Ashgill rocks—mudstone, siltstone and sandstone deposits formed during the Ashgill period of the Ordovician, which here provide a relatively firm foundation for construction despite their susceptibility to weathering.
The defences themselves comprise earthwork fortifications designed to obstruct and delay an invading force, positioned to command approaches to the surrounding terrain. Their layout reflects contemporary military thinking about coastal protection, employing the standard anti-invasion principles developed and deployed across Britain during periods of heightened strategic tension. The underlying geology of fine sedimentary rock would have influenced both the construction techniques employed and the long-term stability of the earthworks.
Now protected by Cadw as a scheduled monument under reference CM372, the site preserves important evidence of Britain's defensive preparations. The defences remain visible as landscape features, their form still discernible despite the weathering effects of centuries on the Ashgill bedrock and overlying soils, offering insight into the military priorities and engineering capabilities of the period in which they were constructed.
Ty Cwm Tawel Anti-invasion Defences is a scheduled monument protected by Cadw under reference CM372. View the official record →
Ty Cwm Tawel Anti-invasion Defences is a post-medieval defensive site protecting a strategic position in Wales. It is designated a Scheduled Ancient Monument by Cadw under reference CM372.
Ty Cwm Tawel 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.
Ty Cwm Tawel 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 CM372.
Several scheduled monuments lie within 10 km, including Trebersed Moated Site (5.9 km), Carmarthen Roman Town (part of) (6.1 km), Carmarthen Roman Fort (part of) (6.3 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Ty Cwm Tawel 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.
Ty Cwm Tawel Anti-invasion Defences stands on Ashgill Rocks (Undifferentiated), bedrock that formed in the Ashgill. The rock here is mudstone, siltstone and sandstone.