British submarine flotilla
...that a British submarine flotilla dominated the Baltic Sea for a major part of WWI, but the loss of the Socialists in the Finnish Civil War forced the crews to scuttle the fleet outside Helsinki?
...that a <b id="mwkQ"><a href="./British_submarine_flotilla_in_the_Baltic" id="mwkg" rel="mw:WikiLink" title="British submarine flotilla in the Baltic">British submarine flotilla</a></b> dominated the <a href="./Baltic_Sea" id="mwkw" rel="mw:WikiLink" title="Baltic Sea">Baltic Sea</a> for a major part of <a class="mw-redirect" href="./WWI" id="mwlA" rel="mw:WikiLink" title="WWI">WWI</a>, but the loss of the <a href="./Finnish_Socialist_Workers'_Republic" id="mwlQ" rel="mw:WikiLink" title="Finnish Socialist Workers' Republic">Socialists</a> in the <a href="./Finnish_Civil_War" id="mwlg" rel="mw:WikiLink" title="Finnish Civil War">Finnish Civil War</a> forced the crews to scuttle the fleet outside <a href="./Helsinki" id="mwlw" rel="mw:WikiLink" title="Helsinki">Helsinki</a>?