Summarised from report:

Part of the 1860's scheme of improvements to the Drop Redoubt Fort included the construction of two sets of casemated gunrooms, one set behind the eastern side of the curtain wall and one set behind the western, they were completed by 1866. These were reached via the caponiers and were designed to provide flanking fire along the ditches of the North and North East Lines.

On the eastern side of the fort, leading off Caponier 4, three interlinked gun rooms are located. These are reached from the landing via a set of timber-iron-timber doors barred from inside. They are arranged in series, with an arched opening between them. Built in brick, beneath a semi-circular vault, each room has a fireplace in its rear wall which was later modified. The face walls have a single carronade embrasure, now blocked, with a shallow recess for sliding shutters which have been removed. The gun rooms are whitewashed and were provided with secondary electric lighting. The suspended timber floors have been removed. (1)

A plan of the fort which was surveyed in 1858, with annotations from 1871 and 1881, shows the gun rooms in detail alongside all of the other major additions which were made to the fort under the 1860's scheme of improvements. (2)

A plan dated to 1866 (approximately at the time when the the caponiers where completed) shows the interior detail of the caponiers and the gun rooms. (3)

<1> English Heritage, 2000, The Western Heights, Dover, Kent. Report No 3 The Drop Redoubt: A 19th-Century Artillery Fortification (Unpublished document). SKE13677.

<2> War Department, 1871-1881, Dover Drop Redoubt Plan Shewing Occupation (Map). SKE51531.

<3> Unknown, 1866, Dover Defences, Western Heights, Drop Redoubt – Record Plans of Caponieres (Map). SKE51533.