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Plan of the harbours and fortifications of Valetta in the island of Malta RMG F0433f
1821 map of the heavily fortified city of Valletta, Malta and its two harbours (Grand Harbour and Marsamxett), an important Royal Navy base in the 19th and 20th centuries

Imperial fortress was the designation given in the British Empire to four colonies that were located in strategic positions from each of which Royal Navy squadrons could control the surrounding regions and, between them, much of the planet.

History

The Imperial fortresses provided not only safe harbours and (with the advent of steam propulsion) coal stores within the area of operation, but also Royal Naval Dockyards where ships of the squadrons could be repaired or maintained without requiring their return to a dockyard in the British Isles.

The Imperial fortresses were also locations where military stores were stockpiled and numbers of soldiers sufficient not only for local defence, but also to provide expeditionary forces to work with the Royal Navy in amphibious campaigns and raids on coasts throughout the regions, could be garrisoned.

These Imperial fortresses originally included:

They were the lynch pins in Britain's domination of the oceans and the Mediterranean and Caribbean seas, including its ability to deny safe passage to enemy naval and merchant vessels while protecting its own merchant trade, as well as to its projection of superior naval and military force anywhere on the planet.

Halifax and Bermuda controlled the trans-Atlantic sea lanes between North America and Europe, and were placed to dominate the Atlantic seaboard of the United States (as demonstrated during the American War of 1812 when the squadron of the Royal Navy's North America Station maintained a blockade of the Atlantic coast of the United States and launched the Chesapeake Campaign from Bermuda, defeating American forces in the Battle of Bladensburg, capturing and burning Washington, DC, and raiding Alexandria, Virginia), as well as to control the western Atlantic Ocean from the Arctic to the West Indies (in the Twentieth Century, the Bermuda-controlled North America and West Indies Station of the Royal Navy would become the 'America and West Indies Station', its area growing to include the western South Atlantic and the Atlantic coast of South America, as well the Pacific Coast from Tierra del Fuego to the Arctic). Gibraltar controlled passage between the Atlantic Ocean and the Mediterranean Sea, and Malta, aside from supporting operations in the Mediterranean and Black Sea, served as a base for naval and military forces that would be able to deploy relatively quickly to the Indian and Pacific Oceans once the Suez Canal was completed in 1869.

Halifax ceased to be an Imperial fortress with the 1867 confederation of the Dominion of Canada, military defence of Canada would be transferred to the militia of the government of the dominion and the British Army withdrew most of its establishment from the continent; the Royal Naval Dockyard, Halifax, was closed in 1905, and sold to the government of the dominion in 1907.

The lack of such an Imperial fortress in the region of Asia, the Indian Ocean and the Pacific Ocean was always to be a weakness throughout the nineteenth century (the British Government, ever unwilling to increase, or even maintain, its defence expenditure, relied on there being few nations outside of the Atlantic and its connected seas that possessed fleets capable of threatening British trade or territories, though the former North American colonies that had become the United States of America were multiplying towards the Pacific coast of North America, and the Russian Empire and Japanese Empire both had ports on the Pacific and were keen to build large, modern fleets).

With no base comparable to an Imperial fortress in East Africa, Mauritius, India, Ceylon, Malaysia, Hong Kong, British Columbia or Australasia, Britain instead relied on Malta, in the Mediterranean Sea, to project power over this vast expanse via the Suez Canal after its completion in 1869 (and, relying on amity and common interests between Britain and the United States during and after the First World War, on Bermuda, via the Panama Canal, which was completed in 1914), although the rising power and increasing belligerence of the Japanese empire after the First World War would result in the construction of the Singapore Naval Base, which was completed in 1938, less than four years before hostilities with Japan did commence during the Second World War.

The need to protect these bases of operation, as well as to prevent, via their captures, their becoming bases of similar utility to an enemy, each was heavily defended, making fortress an apt designation. "Fortress" was often included when giving the names of these colonies, e.g. "Fortress Bermuda". Bermuda, protected by an almost impassable barrier reef and unconnected to any continent, required the least defences, but was heavily garrisoned and armed with coastal artillery batteries. Defence of Bermuda, and of the region, was greatly weakened by the economic austerity that followed the conclusion of the Napoleonic Wars and the American War of 1812, which resulted in drastic reductions to the regular forces and to Reserve Forces in the British Isles (Militia, Volunteer Force, and Fencibles), and in Bermuda (Militia and volunteer artillery), being allowed to lapse. Bermuda's garrison would slowly increase, with the threat of invasion by the United States during and after the American Civil War resulting in further strengthening of the defences. Bermuda's importance to Imperial defence was only increasing, however, and the parlous state of its own defence was commented upon by Sir Henry Hardinge in the House of Commons on the 22nd of March, 1839:

Such were some of the reasons why it appeared to him, that her Majesty's forces should be increased. He might go to other stations Bermuda for instance. All who were conversant with the interests of our West-Indian and North American possessions must know that Bermuda was one of our most important posts—a station where the navy could be refitted with the greatest ease, where during the last war we had about 2,000,000l. value in stores, where our ships (such was the safety of the anchorage) could at all times take refuge. This island had been fortified at very great expense; for some years 5,000 convicts had been engaged on the works, and it was most important in every point of view that this island should be maintained in a state of perfect security. For a long time even after the determination of the sympathisers in the United States to attack us had been known, the force at Bermuda was never greater than a small battalion of 480 or 500 men, perfectly inadequate to do the duties of the station. Considering that this post was one of great consequence, that immense sums had been expended upon it, and that the efficiency of the navy in those seas was chiefly to be secured by means of it, it was indispensable, that it should be in safe keeping. To what quarter were they to look for further reinforcements, should they be needed, to increase our army in America, in the event of the dispute between New Brunswick and Maine becoming more serious? Not to the West Indies, from which two battalions had already been withdrawn. Not to the Canadas, for communication between these provinces and New Brunswick was impracticable, separated as they were by a wilderness of 400 or 500 miles. In the other colonies every man was required. From the Ionian islands not one could be spared, from Malta not one. From Gibraltar, perhaps, one battalion more could be squeezed, if they could bring themselves to inflict great additional hardship on the troops now in garrison there, It really appeared to him absolutely necessary, that Government should look to the state of the army—should fairly consider the amount of work done by it, and apply themselves to the question, whether it was their duty to increase the military force.

Halifax was much more vulnerable to attack than Bermuda, which might come over land or water from the United States, Gibraltar was vulnerable to overland attack by Spain (which remains anxious to recover it) and by Napoleonic France, and both Gibraltar and Malta were much more vulnerable to the navies of the Mediterranean (notably those of Spain, France, Italy, and the Ottoman Empire), and were even more heavily defended.

Naval and military establishments of the imperial fortresses

Bermuda

  • North America and West Indies Station Royal Navy establishment in Bermuda
  • Dominion of Canada and Commonwealth Realm of Canada establishment
  • North America Command
  • Nova Scotia Command
  • Bermuda Garrison (or Bermuda Command after Confederation of Canada). 1701–1957.
    • St. George's Garrison (Eastern District Headquarters)
      • Ordnance Island
      • Royal Army Service Corps Wharf (St. George's)
      • St. George's Armoury
      • East Coast Forts (St. George's, Paget, Governor's, and St. David's Islands)
        • Fort St. Catherine's
        • Fort Victoria
        • Fort Albert
        • Western Redoubt
        • Fort George
        • Town Cut Battery (or Gates' Fort)
        • Alexandra Battery
        • Fort Cunningham
        • Fort Popple
        • Paget Fort
        • Smith's Fort
        • Peniston's Redoubt
        • St. David's Battery
      • Castle Islands Fortifications
        • Devonshire Redoubt
        • Landward Fort
        • Queen's Castle (King's Castle, The Castle, or Seaward Fort)
        • Southampton Fort (or Brangman's Fort)
        • Charles' Fort
        • Martello Tower
        • Burnt Point Fort
        • Ferry Island Fort
    • Prospect Camp (Command Headquarters and Central District Headquarters)
      • Warwick Camp
      • Agar's Island
      • Royal Army Service Corps Wharf (Hamilton)
      • Hamilton Armoury
      • Prospect Hill Position
        • Fort Prospect
        • Fort Langton
        • Fort Hamilton
      • South Shore Batteries (former fixed batteries adapted for field guns)
        • Fort Bruere
        • Bailey's Bay Battery (Tucker's Town Battery, and Tucker's Town Bay Fort)
        • Newton's Bay Fort (Hall's Bay Fort)
        • Albouy's Fort
        • Harris' Bay Fort
        • Sears' Fort
        • Devonshire Bay Fort
        • Hungry Bay Fort
        • Crow Lane Fort (also known as New Paget's Fort and East Elbow Bay Fort)
        • Middleton's Bay Fort (also known as Centre Bay Fort)
        • West Elbow Bay Fort
        • Warwick Camp Battery
        • Warwick Fort
        • Jobson's Cove Fort
        • Great Turtle Bay Battery
        • Jobson's Fort
        • Hunt's Fort (Lighthouse Fort)
        • Ingham's Fort
        • Church Bay Fort East
        • Church Bay Fort West
    • Boaz Island and Watford Island (Clarence Barracks; Western District Headquarters)
      • Somerset Armoury
      • Whale Bay Battery (West Whale Bay)
      • Whale Bay Fort (West Whale Bay)
      • West Side Fort
      • Wreck Hill Fort
      • Scaur Hill Fort
      • Daniel's Island Fort and Daniel's Head (later transferred to Royal Navy then Royal Canadian Navy)
      • Mangrove Bay Fort
      • King's Point Redoubt
      • Maria's Hill Fort
  • Bermuda Militia. 1612–1815.
  • Bermudian Militia, Volunteer and Territorial Army Units, 1895–1965
  • Bermuda Militia Artillery
  • Bermuda Volunteer Rifle Corps
  • Bermuda Volunteer Engineers
  • Bermuda Militia Infantry
  • Royal Bermuda Regiment
  • Bermuda Home Guard
  • Bermuda Cadet Corps
  • Royal Air Force, RAF Darrell's Island. 1939–1945.
  • Royal Air Force Transport Command station, Kindley Field

Halifax, Nova Scotia

Gibraltar

  • British Forces Gibraltar
  • Royal Navy Dockyard, Gibraltar
  • Her Majesty's Naval Base Gibraltar
  • HMS Rooke
  • Fortifications of Gibraltar
    • Alexandra Battery
    • Civil Hospital Battery
    • Cumberland Flank Battery
    • Eliott's Battery
    • Europa Advance Batteries
    • Europa Battery
    • Europa Pass Battery
    • Gardiner's Battery
    • Genista Battery
    • Half Way Battery
    • Harding's Battery
    • Jones' Battery
    • King's Bastion
    • Lady Augusta's Battery
    • Lady Louisa's Battery
    • Lighthouse Battery
    • New Mole Battery
    • O'Hara's Battery
    • Orange Bastion
    • Parson's Lodge Battery
    • Prince Albert's Front
    • Prince of Wales Battery
    • Raglan's Battery
    • Rock Gun Battery
    • Signal Hill Battery
    • Victoria Battery
    • Wellington Front
    • Windmill Hill Batteries
    • Woodford's Battery
    • Zoca Flank Battery
  • Devil's Tower Camp
  • Retrenched Barracks
  • RAF Gibraltar
  • Royal Gibraltar Regiment
  • 2nd Battalion, Royal Garrison Regiment

Malta

  • Lascaris War Rooms
  • Admiralty House, Valletta
  • Royal Naval Dockyard, Malta
  • HMS Egmont or HMS St Angelo
  • HMS Phoenicia (Fort Manoel)
  • HMS Euroclydon
  • Royal Navy Hospital Mtarfa
  • Malta Command
  • Fortifications of Malta
    • Fortifications of Mdina
    • Cambridge Battery
    • Cittadella
    • Della Grazie Battery
    • Fort Benghisa
    • Fort Chambray
    • Fort Campbell
    • Fort Delimara
    • Fort Leonardo
    • Fort Mellieħa
    • Fort Ricasoli
    • Fort Rinella
    • Fort St. Angelo
    • Fort Saint Elmo
    • Fort Saint Michael
    • Fort Saint Rocco
    • Fort San Lucian
    • Fort San Salvatore
    • Fort Tas-Silġ
    • Fort Tigné
    • Fort Pembroke
    • Fort Verdala
    • Garden Battery
    • Għargħar Battery
    • Lascaris Battery
    • Pembroke Battery
    • Saint Mary's Tower (or Comino Tower)
    • Saint Paul's Battery
    • Sliema Point Battery
    • Spinola Battery
    • Tarġa Battery
    • Victoria Lines
      • Fort Binġemma
      • Fort Madalena
      • Fort Mosta
    • Wolseley Battery
    • Żonqor Battery
  • Pembroke Army Garrison
  • Malta Tanks (Royal Tank Regiment)
  • Royal Malta Artillery
  • Malta Fortress Squadron, Royal Engineers
  • Royal Signals in Malta
  • The King's Own Malta Regiment
  • 1st, 3rd, and 4th Battalions, Royal Garrison Regiment
  • Royal Malta Fencible Regiment
  • Air Headquarters Malta
  • RAF Hal Far
  • RAF Luqa
  • RAF Ta Kali
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