These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade.

Milefortlet 5 was situated in a field just south of the hamlet of Cardurnock in the civil parish of Bowness.

[1] In Phase 3 the ramparts were retained but they were refaced on the south, west and north sides, and it seems a stone building in the fortlet was built during this period.

These towers were positioned approximately one-third and two-thirds of a Roman mile to the west of the Milefortlet.

However the coastline at this point is interrupted by Moricambe Bay, and any additional towers are purely conjectural.