 An earthwork bank defends the landward side of the blockhouse, described variously as between around 0.5 metres (1 ft 8 in) and 2 metres (6 ft 7 in) high, similar to those found around forts of this period along the Thames River in England. There are also the remains of a defensive stone wall on the seaward side of the blockhouse, although much of the wall has been destroyed by coastal erosion.
