Lord Salisbury described Malta, Gibraltar, Bermuda, and Halifax as Imperial fortresses at the 1887 Colonial Conference,[1] though by that point they had been so designated for decades.[2][3][4][5][6][7] Later historians have also given the title "imperial fortress" to St. Helena and Mauritius, despite their lacking naval dockyards and not serving as home bases for station naval squadrons.[8]
The fortresses provided safe harbours; coal stores; and dockyards to protect and supply Royal Navy warships.[9][10] They had numbers of soldiers sufficient not only for local defence, but also to provide expeditionary forces to work with the Royal Navy, as well as stockpiles of military supplies.[11]
3. That if it were deemed expedient to keep garrisons in certain imperial fortresses situated within the colonies, the expense of such garrisons should also be borne by the imperial government.
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I say nothing as to Malta or Gibraltar; those are great Imperial fortresses, and must be held in strength. So again, such places as Hong-Kong, or Bermuda, or Aden, cannot be left without defence.
in 1866, William F. D. Jervois (later Sir), who had served as secretary of the commission, visited Malta and produced a report entitled Memorandum with reference to the improvements to the defences of Malta and Gibraltar, rendered necessary by the introduction of iron plated ships and powerful rifled guns. In this report, Malta, along with Gibraltar, Halifax and Bermuda, was given the designation of an "imperial fortress"
yet we might be in imminent danger of investment, and might possibly feel the stress of hunger. We keep Bermuda and Halifax as Imperial fortresses to provide for the contingencies of war with the States, and yet take no thought how, in that event, we are to feed our people at home.
That charge may be said to be entirely incurred by our possession of Gibraltar, Malta, Bermuda, Hong Kong, and St. Helena, which are not Colonies in any right sense, but Imperial fortresses, military or naval stations, maintained in support of the British dominion
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