Summarised from report:

The North Entrance to the Western Heights was situated between the North centre bastion and the drop redoubt at a narrow point of the ridge towards the north-eastern end of the fortress, where the North Military Road completed its more moderate ascent from Dover town. The earliest phase of works on this entrance dates to the Napoleonic period, it was located at the top of a slight combe, which was flanked by the North Centre Bastion on the west and by the North-East Flank of the Lines on the east. It crossed the north lines via a bridge. Further work on the North Entrance began in in March 1860 and it was completed in February 1864 this created a more elaborate defensive scheme and perhaps reflects a greater concern with a potential assault from the north. (1-2)

<1> RCHME, 2000, The Western Heights, Dover, Kent. Report No 6: The Entrances to the Fortress: 19th-century artillery fortifications (Unpublished document). SKE17501.

<2> Captain Robert Thomson, 1815, Kent: Dover. Sketch plan and sections, on a single sheet, of fortifications on the Western Heights. (Plan). SKE51619.