Upnor Castle is an Elizabethan artillery fort located on the west bank of the River Medway in Kent. It is in the village of Upnor, opposite and a short distance downriver from the Chatham Dockyard, at one time a key naval facility. The fort was intended to protect both the dockyard and ships of the Royal Navy anchored in the Medway. It was constructed between 1559–67 on the orders of Elizabeth I, during a period of tension with Spain and other European powers. The castle consists of a two-storeyed main building protected by a curtain wall and towers, with a triangular gun platform projecting into the river. It was garrisoned by about 80 men with a peak armament of around 20 cannon of various calibres.
Despite its strategic importance, the castle and the defences of the Thames and Medway were badly neglected during the 17th century. The Dutch Republic mounted an unexpected naval raid in June 1667, and the Dutch fleet was able to breach the defences, capturing two warships and burning others at anchor in the river at Chatham, in one of the worst defeats suffered by the Royal Navy. Upnor Castle acquitted itself better than many of the other defensive sites along the upper Medway, despite its lack of provisioning. Gun fire from the fort and from adjoining emplacements forced a Dutch retreat after a couple of days, before they were able to burn the dockyard itself.
Coordinates: 51°24′37″N 0°31′34″E / 51.4104°N 0.526°E / 51.4104; 0.526
Lower Upnor and Upper Upnor are two small villages in Medway, Kent, England. They are in the parish of Frindsbury Extra on the western bank of the River Medway. Today the two villages are mainly residential and a centre for small craft moored on the river, but Upnor Castle is a preserved monument, part of the river defences from the sixteenth century.
Upnor meant "at the bank" being "æt þæm ōre" in Old English and "atten ore" in Middle English and "atte Nore" in 1292. However, the meaning changed to "upon the bank" (Middle English: "uppan ore") and by 1374 it was "Upnore".
A skeleton of a Straight-tusked Elephant was excavated in 1911, during the construction of the Royal Engineers' Upnor Hard.
Lower Upnor faces Upnor Reach. It was a single row of houses, separated from the river by the roadway and the hard. Located here is the Arethusa training centre, run by the Shaftesbury Homes. In 1849, HMS Arethusa was the name of the training ship moored near the shore. The society had moored a training ship here for over 105 years. The first was the Chichester, but after then all the ships were called Arethusa. The last but one Arethusa was the Peking, one of the R.F Laeisz's Flying P-Liner four-masted barques, built in 1911, and acquired after 1918 as war reparations. She was sold in 1975 to the South Street Seaport Museum in New York. The last Arethusa, a 23 metre two-masted ketch, was sold in 2000 and now sails with the Cirdan Sailing Trust under the name Faramir.