It is almost impossible to realise the extent to which the coast-line must have altered. According to tradition, a long spit of land once ran out from Sudbrook Point in a south-westerly direction, extending as far as the Denny, a rocky islet now lying in mid-channel at a distance of over four miles from Sudbrook.
Sudbrook fort’s certainly been nibbled away at by the Severn over the years. And there’s a lot of mud about. It’s a long way though!
In the 17th C. Camden described the erosion rather elegantly: The Church whereof, called Trinity Chappell, standeth so neare the sea, that the vicinity of so tyrannous a neighbour hath spoiled it of halfe the church-yarde, as it hath done also of an old fortification lying thereby, which was compassed with a triple ditch and three rampiers, as high as an ordinary house, cast in forme of a bowe, the string wherof is the sea-cliffe.”
From AE Lawson Lowe’s article on the camp in Archaeologia Cambrensis (Jan 1886).