Iron Duke-class battleships
... that Iron Duke, the lead ship of the Iron Duke-class battleships was the flagship of the British Grand Fleet at the Battle of Jutland in May 1916?
... that <a about="#mwt16" data-mw='{"parts":[{"template":{"target":{"wt":"HMS","href":"./Template:HMS"},"params":{"1":{"wt":"Iron Duke"},"2":{"wt":"1912"},"3":{"wt":"2"}},"i":0}}]}' href="./HMS_Iron_Duke_(1912)" id="mwAeU" rel="mw:WikiLink" title="HMS Iron Duke (1912)" typeof="mw:Transclusion"><i>Iron Duke</i></a>, the <a href="./Lead_ship" id="mwAeY" rel="mw:WikiLink" title="Lead ship">lead ship</a> of the <b id="mwAec"><a about="#mwt17" data-mw='{"parts":[{"template":{"target":{"wt":"sclass","href":"./Template:Sclass"},"params":{"1":{"wt":"Iron Duke"},"2":{"wt":"battleship"},"3":{"wt":"2"}},"i":0}}]}' href="./Iron_Duke-class_battleship" id="mwAeg" rel="mw:WikiLink" title="Iron Duke-class battleship" typeof="mw:Transclusion"><i>Iron Duke</i>-class</a><span about="#mwt17"> battleship</span>s</b> was the <a href="./Flagship" id="mwAek" rel="mw:WikiLink" title="Flagship">flagship</a> of the British <a href="./Grand_Fleet" id="mwAeo" rel="mw:WikiLink" title="Grand Fleet">Grand Fleet</a> at the <a href="./Battle_of_Jutland" id="mwAes" rel="mw:WikiLink" title="Battle of Jutland">Battle of Jutland</a> in May 1916?