Roman Cumbria to Wallsend on the Tyne estuary, with additional military installations running down the Cumbrian coast from Bowness to Risehow, south of Maryport, in an integrated fashion (and with forts at Burrow Walls and Moresby that were perhaps not part of the system). Historians believe that the Turf Wall from the River Irthing to Bowness-on Solway was rebuilt in stone in two stages. The most easterly five miles were rebuilt at the time of Hadrian, with the remainder being rebuilt after 150 AD. However, this is open to dispute: it is uncertain whether the building works in the second half of
Milecastle 73 locations of the turrets have not been found. Both sites fall within Burgh Marsh where there is no evidence for any Wall structures. Milecastle 73 Milecastle 73 (Dykesfield) was one of a series of Milecastles or small fortlets built at intervals of approximately one Roman mile along Hadrian's Wall (). Milecastle 73 is situated about a mile west of the village of Burgh by Sands. There are no visible remains above ground. Milecastle 73 was located and partially excavated in 1948. It measured 19.2 metres north-south by 18.7 metres east-west internally. The walls were 2 metres thick. The milecastle was