A martello tower, set within a dry moat and outer glacis (sloping ban). It is one of a series of six moated towers, constructed in 1805-6 to defend the coastline between Hythe and Folkestone, and lies around 400 metres north west of tower no 4. The slightly elliptical, brick built tower measures up to 13 metres in diameter externally and stands complete to its original height of about 10 metres. As part of the original design, soil was built up against the outer face of the moat wall to form a glacis, which slopes away from the lip of the moat for a distance of up to 20 metres. The external face of the tower was rendered in cement mortar, or stucco, which served to strengthen the outer skin of bricks. A thick cental column rises from the basement to the top of the tower, from which springs the barrel vaulted first floor ceiling which supports the gun platform on the roof. Scheduled.