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Distribution of RN Submarines WW1

The British Fleet at the moment when WWI was declared possessed 72 submarine torpedo-boats built and 22 building. Some of these were however, stationed at the oversea naval bases. The composition and distribution of the submarine flotillas at the outbreak of hostilities were as follows:

Submarines in Home Waters

Submarines on Foreign Stations

The statement that the headquarters of the various submarine flotillas in home waters are at Chatham Portsmouth, and Devonport, must not be taken as indicating that these are the only points along the coast protected by submarines. These places are merely the chief bases of the Patrol Flotillas. The wide range of action of modern submarines enables them to operate several hundred miles from any base or depot, and consequently Chatham becomes merely the general store, or head-depot, of what should be termed the North Sea Flotillas, which not only patrol the whole East, North-East and South-East Coasts of England and Scotland, but also have their floating secondary bases in the form of Depot ships, which, with their attached submarines, are often at Harwich, Newcastle, Rosyth, etc In the same way Portsmouth is merely the headquarters of the submarines patrolling the Channel; and Dover, Portland, etc, are seldom without strong flotillas of submarines with their Depot ships. The Devonport Flotillas have the longest coast-line to patrol, for their area covers not only the West Coast of England, Wales and Scotland, but also the Irish Coast They are, however, furthest removed from the zone of war.

Considerable alterations took place in the composition and distribution of the British submarine flotillas following the outbreak of war, with the object of materially strengthening the Fleet in the main theatre of operations, but the addition to the flotillas of new vessels of the E Class nearly completed when war broke out, made this rearrangement possible without materially weakening the flotillas guarding the more distant coasts of Great Britain or recalling vessels from overseas.

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