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Gosport Tower

Also known as, or recorded in historical documents as;
Fort Blockhouse; Chiderodd

In the civil parish of Gosport.
In the historic county of Hampshire and the Isle of Wight.
Modern Authority of Hampshire.
1974 county of Hampshire.
Medieval County of Hampshire.

OS Map Grid Reference: SZ626992
Latitude 50.79039° Longitude -1.11299°

Gosport Tower has been described as a certain Artillery Fort, and also as a certain Chain Tower.

There are no visible remains.

This site is a scheduled monument protected by law.


One of the original defences of the principal entrance to Portsmouth Harbour, Blockhouse began as a boom tower erected in the reign of Edward VI to hold one end of a boom chain. It was subsequently improved and enlarged and became known by its present title some time in the eighteenth century (Hogg).
The Henrician tower was in a state of decay by 1585 and although proposals were made to replace it, little seems to have been done. As the Western end of the 'harbour chain', it appears to have been replaced by a fixed point or perhaps capstan to hold the chain until de Gomme redesigned the harbour defences. In 1667 he built an L-shaped battery there with 17 or 18 guns facing South-East and 2 South-West (Williams 1979). (PastScape)

he original Blockhouse was constructed between 1420-1422 at the north-eastern end of the spit in a natural position for defending the entrance to Portsmouth Harbour, opposite the still surviving Round Tower on the Portsmouth side. Both were connected by a chain which could be raised to close the harbour entrance. in 1542 Leland described The Blockhouse as a round stone tower with ordnance. Both the Blockhouse and Bulwark are shown on a portrait of 1545 as a round tower with supporting buttresses and battlements and a larger two-tiered circular fortification respectively, although the accuracy of this portrait is open to question. However, an armament list of c.1547 mentions the Bulwark but not the Blockhouse, possibly suggesting that the latter had been disarmed by this date. Indeed, the Blockhouse is not shown on a map of c.1588 the Bulwark was described as old and decayed and its remains were still visible as a mound in early-mid 17th century. (Hampshire AHBR)

Held east end of harbour chain, west end held by Round Tower, Portsmouth. A supplementary bulwark Lymden's Bulwark, lay to the south.
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Sources of information, references and further reading
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This record last updated 26/07/2017 09:20:06

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