[5] and was occupied until around 130 AD, housing up to 800 infantry in rows of barracks within the 2.1 hectares (5.2 acres) banked enclosure.

[5][6] In 1959, this site was initially identified via aerial photography revealing a series of parchmarks covering an area of around 20,000 square metres (2 ha).

The principle forts are spaced to be a day's march from their neighbour, allowing safe movement of troops across what would at least initially have been hostile territory.

[9] Exploration of the northeastern portion of the fort revealed evidence of a large timber building.

[5] In November 2005, Trawscoed fort was explored using fluxgate gradiometer surveys by David Hopewell.

[10] The researchers then took this data and used Geoplot 3.0 software to generate X-Y waterfall plots and greyscale maps of the region.

Any locations where fire was, such as kilns and burning wooden structures, also increased the amount of magnetic response.

He recorded finding small anomalies on either side of the gate, which may indicate the presence of what was once a guard tower.

[10] The rest of the area to the northeast contains faint parallel striations in the magnetic map, which may indicate ploughing, followed by spots which may have been campfires.

[11] A group from FC Wales removed the gorse, and foresters laid down hay from the nearby Penrhyncoch meadow.