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The '''Twelfth Submarine Flotilla''' was a formation of [[Submarine|submarines]] of the [[Royal Navy]]. ==History== ===January, 1917=== The flotilla is established to join the {{UK-SF|10}} and {{UK-SF|11}} in directly supporting the [[Grand Fleet]]. It starts with a single cruiser, {{UK-1Fearless}} which had been attached to the [[Grand Fleet]] and one of the new "K" class submarines.{{SMNLJan17|p. 12}}{{SMNLDec16|p. 12}} {|width=75% class="toccolours" |- | style="background:#CEDFF2" align=center colspan=6 | '''Supporting the [[Grand Fleet]]''' |- |align=center colspan=6|'''Light Cruiser''' |- |align=center colspan=6|{{UK-1Fearless}} |- |align=center colspan=6|'''Submarines''' |- |colspan=6 align=center|{{UK-K3}} |- |} ===March, 1917=== By March, three more submarines had joined, bringing the strength to a scout cruiser and four steam submarines.{{SMNLMar17|p. 12}} {|width=75% class="toccolours" |- | style="background:#CEDFF2" align=center colspan=6 | '''Supporting the [[Grand Fleet]]''' |- |align=center colspan=6|'''Light Cruiser''' |- |align=center colspan=6|{{UK-1Fearless}} |- |align=center colspan=6|'''Submarines''' |- |&nbsp;||align=center|{{UK-K1}}||align=center|{{UK-K2}}||align=center|{{UK-K3}}||align=center|{{UK-K4}} |- |} ===April, 1917=== Four more submarines have joined, bringing the strength to a scout cruiser and eight steam submarines. In May, ''Fearless'' would have a Captain (S) embarked.{{SMNLApr17|p. 12}} {|width=75% class="toccolours" |- | style="background:#CEDFF2" align=center colspan=6 | '''Supporting the [[Grand Fleet]]''' |- |align=center colspan=6|'''Light Cruiser''', Captain (S) from May onward |- |align=center colspan=6|{{UK-1Fearless}} |- |align=center colspan=6|'''Submarines''' |- |&nbsp;||align=center|{{UK-K1}}||align=center|{{UK-K2}}||align=center|{{UK-K3}}||align=center|{{UK-K4}} |- |&nbsp;||align=center|{{UK-K6}}||align=center|{{UK-K7}}||align=center|{{UK-K8}}||align=center|{{UK-K11}} |- |} Apart from the arrival of the Captain (S), the roster would remain unchanged until June.{{SMNLMay17|p. 12}} ===June, 1917=== {{UK-K11}} has been sent to the new {{UK-SF|13}}, a second formation of these large submarines. She is replaced by the {{UK-K5}}. The strength remains as a flagship cruiser and eight submarines.{{SMNLJun17|p. 12}} {|width=75% class="toccolours" |- | style="background:#CEDFF2" align=center colspan=6 | '''Supporting the [[Grand Fleet]]''' |- |align=center colspan=6|'''Flagship''', Captain (S) |- |align=center colspan=6|{{UK-1Fearless}} |- |align=center colspan=6|'''Submarines''' |- |&nbsp;||align=center|{{UK-K1}}||align=center|{{UK-K2}}||align=center|{{UK-K3}}||align=center|{{UK-K4}} |- |&nbsp;||align=center|{{UK-K5}}||align=center|{{UK-K6}}||align=center|{{UK-K7}}||align=center|{{UK-K8}} |- |} This roster would remain until October.{{SMNLJul17|p. 12 and Supplements through October}} ===October, 1917=== {{UK-K17}} has arrived, possibly... she is also listed as being in the {{UK-SF|13}} this same month. The strength is now a flagship cruiser and eight or nine submarines.{{SMNLOct17|p. 12}} {|width=75% class="toccolours" |- | style="background:#CEDFF2" align=center colspan=6 | '''Supporting the [[Grand Fleet]]''' |- |align=center colspan=6|'''Flagship''', Captain (S) |- |align=center colspan=6|{{UK-1Fearless}} |- |align=center colspan=6|'''Submarines''' |- |colspan=2 align=center|{{UK-K1}}||colspan=2 align=center|{{UK-K2}}||colspan=2 align=center|{{UK-K3}} |- |colspan=2 align=center|{{UK-K4}}||colspan=2 align=center|{{UK-K5}}||colspan=2 align=center|{{UK-K6}} |- |colspan=2 align=center|{{UK-K7}}||colspan=2 align=center|{{UK-K8}}||colspan=2 align=center|{{UK-K17}} |- |} ===November, 1917=== {{UK-K17}} is now only listed under the {{UK-SF|13}}. The strength is a flagship cruiser and eight submarines.{{SMNLNov17|p. 12}} {|width=75% class="toccolours" |- | style="background:#CEDFF2" align=center colspan=6 | '''Supporting the [[Grand Fleet]]''' |- |align=center colspan=6|'''Flagship''', Captain (S) |- |align=center colspan=6|{{UK-1Fearless}} |- |align=center colspan=6|'''Submarines''' |- |&nbsp;||align=center|{{UK-K1}}||align=center|{{UK-K2}}||align=center|{{UK-K3}}||align=center|{{UK-K4}} |- |&nbsp;||align=center|{{UK-K5}}||align=center|{{UK-K6}}||align=center|{{UK-K7}}||align=center|{{UK-K8}} |- |} ===December, 1917=== {{UK-K1}} has been removed, lost in a collision on 17 November. The strength is now a flagship cruiser and seven submarines.{{SMNLDec17|p. 12}} {|width=75% class="toccolours" |- | style="background:#CEDFF2" align=center colspan=6 | '''Supporting the [[Grand Fleet]]''' |- |align=center colspan=6|'''Flagship''', Captain (S) |- |align=center colspan=6|{{UK-1Fearless}} |- |align=center colspan=6|'''Submarines''' |- |colspan=2 align=center|{{UK-K2}}||colspan=2 align=center|{{UK-K3}}||colspan=2 align=center|{{UK-K4}} |- |&nbsp;||align=center|{{UK-K5}}||align=center|{{UK-K6}}||align=center|{{UK-K7}}||align=center|{{UK-K8}} |- |} This roster would apply until February.{{SMNLJan18|p. 12}} ===February, 1918=== {{UK-K4}} has been removed, lost in a collision on 31 January. The strength is now a flagship cruiser and six submarines.{{SMNLFeb18|p. 12}} {|width=75% class="toccolours" |- | style="background:#CEDFF2" align=center colspan=6 | '''Supporting the [[Grand Fleet]]''' |- |align=center colspan=6|'''Flagship''', Captain (S) |- |align=center colspan=6|{{UK-1Fearless}} |- |align=center colspan=6|'''Submarines''' |- |align=center|{{UK-K2}}||align=center|{{UK-K3}}||align=center|{{UK-K5}}||align=center|{{UK-K6}}||align=center|{{UK-K7}}||align=center|{{UK-K8}} |- |} ===March, 1918=== {{UK-K15}} has joined. The strength is now a flagship cruiser and seven submarines.{{SMNLMar18|p. 12}} {|width=75% class="toccolours" |- | style="background:#CEDFF2" align=center colspan=6 | '''Supporting the [[Grand Fleet]]''' |- |align=center colspan=6|'''Flagship''', Captain (S) |- |align=center colspan=6|{{UK-1Fearless}} |- |align=center colspan=6|'''Submarines''' |- |align=center|{{UK-K2}}||align=center|{{UK-K3}}||align=center|{{UK-K5}}||align=center|{{UK-K6}}||align=center|{{UK-K7}}||align=center|{{UK-K8}} |- |align=center colspan=6|{{UK-K15}} |- |} This roster would apply until May.{{SMNLApr18|p. 12}} ===May, 1918=== {{UK-RoyalArthur}} has joined to act as a depot ship. The strength is now a flagship cruiser, a depot ship and seven submarines.{{SMNLMar18|p. 12}} {|width=75% class="toccolours" |- | style="background:#CEDFF2" align=center colspan=6 | '''Supporting the [[Grand Fleet]]''' |- |align=center colspan=6|'''Flagship''', Captain (S) |- |align=center colspan=6|{{UK-1Fearless}} |- |align=center colspan=6|'''Depot Ship''' |- |align=center colspan=6|{{UK-RoyalArthur}} |- |align=center colspan=6|'''Submarines''' |- |align=center|{{UK-K2}}||align=center|{{UK-K3}}||align=center|{{UK-K5}}||align=center|{{UK-K6}}||align=center|{{UK-K7}}||align=center|{{UK-K8}} |- |align=center colspan=6|{{UK-K15}} |- |} This roster would apply through the end of the war and until March, 1919.{{SMNLJun18|p. 12 and Supplements through March, 1919}} ===March, 1919=== A post-war reorganization sees the flotilla re-designated, with an unaltered roster, as the {{UK-SF|1}}. The Twelfth Flotilla is disestablished.{{SMNLMar19|p. 12}} {|width=75% class="toccolours" |- | style="background:#CEDFF2" align=center colspan=6 | '''Disestablished''' |- |align=center colspan=6|Not to be re-instituted during the Dreadnought Era |} ==Captains (S)== Dates of appointment given: <div name=fredbot:office0 otitle="Captain (S), Twelfth Submarine Flotilla" nat="UK"> {{Tenure|rank=Captain|name=Charles James Colebrooke Little|nick=Charles J. C. Little|appt=26 September, 1916<ref>Little Service Record. {{TNA|ADM 196/47/95.|D7603802}} f. 300.</ref>|end=4 March, 1919<ref>Little Service Record. {{TNA|ADM 196/47/95.|D7603802}} f. 300.</ref>}} </div name=fredbot:office0> ==Footnotes== {{reflist}} ==Bibliography== {{refbegin}} {{refend}} ==See Also== {{refbegin}} {{refend}} {{RNSubmarineFlotillas|sort=12}}

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