 They built many sandbag pillboxes in the area between July and September 1940; but the concrete pillboxes were put out to local tender.There is another pillbox near Morwick on the west side of the east coast main line.It is rectangular, half brick and half concrete, and was probably built to defend the railway viaduct or to protect the soldiers who would have been ordered to blow up the viaduct in the event of an invasion.