Summarised from report:

The original North-East Line was constructed in 1804-1816 between the Drop Redoubt’s eastern face and the escarpment at the south-eastern edge of the Heights – demonstrates the response to the perceived risk that an attacking force might outflank the defences by moving down the eastern side of the Drop Redoubt. Offensive firepower was concentrated on the Drop Redoubt’s terre-plein rather than on the Line itself. The North-East Line is one of the stretches of Lines constructed to create an entrenched encampment or fortress on the hilltop to protect a large field force in garrison quarters who could not be accommodated in the Citadel and Drop Redoubt. Between 1859 and 1862 a new North-East Line was constructed on a greater scale and on a different alighnment (1)

<1> Liv Gibbs, 2012, Built Heritage Conservation Framework for Dover Western Heights (Unpublished document). SKE17708.