History of the Fort   Text and Diagrams of the Fort Text and Pictures of the Fort Pictures and Drawings of the Fort Bull Sands Fort or the Northern Fort as it was known for security reasons during its construction, is the larger of the two island forts, decided upon by the military      authorities towards the end of 1914. The fort is located on extensive sand banks 4200 yards southwest of Spurn Head lighthouse, with deep water channels about three quarters of a mile away on either side.