gives each of them a felling date of between October AD 44 and March AD 45. The main fortress must have been built earlier, probably in the year of invasion, 43 AD.

The smaller enclosure, with its U-shaped ditch and square corners was atypical for Roman forts, and was interpreted as a parade ground. Parallels for this have been found associated with legionary fortress of Lambaesis (Algeria), as well as at Tomen y Mur (Gwynedd).