George Thomas Clark, Mediæval Military Architecture in England…
“ It will thus be seen that Lincoln Castle, as regards its earthworks, belongs to that type of English fortress in which the mound has its proper ditch, and is placed on one side of an appended area, also with its bank and ditch. The general area, which at Windsor, Arundel, and Berkhampstead is oblong, to suit the contour of the ground, is here, as at Tonbridge, Tickhill, and Clare, where the ground is not strongly marked, nearer to a more solid figure, of which, in this case, two sides and the contained angle are governed by the line of the old Roman wall. ”
