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- By 1845 further extensive modifications were considered necessary and it was perhaps fortuitous that, in 1845, as a
result of an underspend, the rebuild at Blockhouse Fort was chosen by the Commanding Royal Engineer at Portsmouth as the single most important item for the defence of Portsmouth harbour. It is from this
period that many of the existing buildings date, including the North Bastion. All work was completed by 1848, at a cost of £9,000. However, the updated fort, so important in 1850, was superfluous by
1860, as a result of a new policy in the light of a changed threat and the introduction of effective rifled ordinance. It did not remain unused for long. The Royal Engineers had responsibility for the
defence of the main ports, and investigations into the use of defensive minefields had been actively pursued since 1863. In 1873, the Portsmouth Company of Submarine Mining Engineers was established,
probably quartered in Blockhouse from the start. Certainly Blockhouse became the main depot, with many new buildings erected during this period, some of which still survive. By 1904, the decision was
made to phase out mining in favour of a more modern and much more effective port defence weapon - the submarine.
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