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.

The 1962 excavations revealed the ditch and rampart, and uncovered flagged floors with pottery sherds found between the stones.

[1] The 1968 excavations revealed an entrance 1.8 metres wide in the rampart facing the cliff.

[1] Each milefortlet had two associated towers, similar in construction to the turrets built along Hadrian's Wall.

[2][3] Tower 22A is identified with a low turf-covered mound, 10 centimetres high, on Maryport Golf Course.