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The earliest use of this spit of land is unclear, possibly by the Romans, the term ‘blockhouse’ deriving from a simple fortified position used to deny access to some important castle or, as in this case,
haven. The burning of Portsmouth and Gosport during the Hundred Years War precipitated the need for proper defensive measures and, in 1417, expenditure was authorised on the king’s towers, to provide
protection for the ends of the chain at the harbour entrance. The defences were further upgraded in 1495, with the building of the new dock at Portsmouth, when five pieces of ordnance were mounted
on the “King’s Blokkehouse”. NEXT PAGE
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