The coastline to the north is interrupted by Moricambe Bay, and the next known fort is Milefortlet 5. Milefortlets 8, 7 and 6 were once thought to have been eroded by Moricambe, but there is in fact no evidence that the sites ever existed,David Colin Arthur Shotter, (1995), The Roman frontier in Britain: Hadrian's Wall, the Antonine Wall, and Roman policy in the north. page 73. Carnegie Pub. and the system to the north is believed to begin again with Milefortlet 5.John Collingwood Bruce, Charles Daniels (1978), Handbook to the Roman Wall, with the Cumbrian coast and outpost forts, page 34. H. Hill
