||Part of the dockyard defence dating from 1669, replacing
Upnor Castle. Now vanished.
||There are some overgrown but visible remains of the 1669 fort built on the north side of the river opposite Gillingham. It had 2 tiers of guns, 21 on the lower tier and 20 on the upper and was surrounded by a dry ditch and earthworks. It fell into ruins by the end of 18th century.
|| These surrounded the whole east side of the dockyard
down to St Mary's Island. Now almost completely built over.
||Open, being restored.
||In use until 1828, then used as a hospital until 1919. The site has been used as a school since 1929 and although much of the structure has been built over parts of the walls and ditches still remain. Private.
||On the east bank of the Medway, it has a three storey
tower. Now converted to flats.
||On eastern end of the Isle of Grain. Demolished in 1962.
|Grain Dummy Battery
||South of Grain Fort, in fair condition.
|Grain Tower Battery
||Off shore of Grain Fort, in fair condition.
|| On the north-western tip of Sheerness Docks. Private.
|| On the north coast of the Hoo peninsula, it is now
a riding stable.
||The site was demolished in 1975.
In use until 1961, now private and closed.
|1876 - 92
||On high ground overlooking Chatham. In poor condition.
||Now used as a business centre, private.
||Near the coast east of Gillingham at Grange & Twydall.
||A circular fort on an island in the Medway built between
1861 and 1872. Armed with 11 seven & nine inch RMLs, manned by
a complement of 100. It can be visited by boat. Photo and map below.
||Same design as Darnet, 1km away on another island in
the Medway. Built on the site of a 17th century gun battery. Private. Photo and map below.