References regarding the relation of the site to other defence sites. (1-4).

Part of a seaward defensive line first constructed in 1699. Nothing now remains above ground. Originally sighted south-east of Albemarle Battery (TQ 97 NW 115) and included an engine room for electric lights, two batteries of two 12 pdr guns each. A fragment of a 12 pdr battery remains only.(5)

From the National Heritage List for England:
17th Century Defences: surviving portion of late 17th century fortifications designed by Sir Bernard de Gomme. Stretch if indented trace east of Garrison Point Fort. Largely faced in Portland ashlar to cordon. The brick parapet is later and together with the rampart had been remodelled and mutilated by 19th century gun positions. At three angles are moulded corbels which carried sentry boxes.

Historic England archive material (6)

<1> Sheerness Defences, Garrison Point Fort and the Indented Lines/ink survey (Graphic material). SKE6431.

<2> Sheerness Defences, Garrison Point Fort and the Indented Lines/overlay (Graphic material). SKE6432.

<3> Sheerness Defences, the Indented Lines (Bibliographic reference). SKE6439.

<4> RCHME: Sheerness Defences, Kent (Collection). SKE6533.

<5> Royal Commission on Historic Monuments in England, 1995, Sheerness: The Dockyard, Defences and Blue Town (Unpublished document). SWX6974.

<6> Historic England, Archive material associated with the Sheerness Lines (Archive). SKE56321.