Roman administrative document from the early 5th century, also records the presence of the Cohors I Baetasiorum at Reculver, then known as Regulbium. There must also have been a harbour nearby in Roman times, and, though this has not yet been found, it was probably near to the fort's southern or eastern side. The walls of the fort originally stood about high and were thick at their base, reducing to at the top; they were reinforced internally by an earthen bank. The entrance to the fort's headquarters building faced north, indicating that the main gate was on the north side, facing the eponymous promontory and the sea. The north wall has been lost to the sea, along with the adjoining part of the east wall and most of the west wall; the east wall is most complete and includes the remains of the eastern gateway and guard post. Parts of the surviving walls are all that remains of the fort above ground, and all have suffered from stone-robbing, especially near the south-western corner. The walls were originally faced with ragstone, but very little of this remains: otherwise only the cores of the walls are visible, consisting mostly of flint and concrete and standing only high at their highest. Roman forts were normally accompanied by a civilian settlement, or vicus: at Reculver this lay outside the north and west sides of the fort, much of it in areas now lost to the sea, and was extensive, perhaps covering "some ten hectares [25 acres] in all." In 1936 R.F. Jessup noted that "a Roman building with a hypocaust and tesselated [floor once] stood considerably to the northward of the fort": this structure had been observed by the 18th-century antiquarian John Battely, and was probably "an external bath relating to [an early phase of] the fort." In the same area Battely described "several cisterns" between 10 and 12 feet (3–3.7 m) square, lined with oak planks and sealed at the bottom with puddled clay. He believed that these were for storing rainwater, and noted that a Roman strigil, which would have been used in a bath house, had been found in a similar cistern at Reculver; he also observed that "such a multitude [of cisterns] has been discovered, almost in our memory, as proves that the ancient inhabitants of the place were very numerous." In the 20th century twelve wells of the Roman