SM U-21
... that the sinking of the British scout cruiser HMS Pathfinder by the German U-boat SM U-21 in 1914 was the first time a warship was sunk by a modern submarine?
... that the sinking of the British scout cruiser <a href="./HMS_Pathfinder_(1904)" id="mwog" rel="mw:WikiLink" title="HMS Pathfinder (1904)">HMS <i id="mwow">Pathfinder</i></a> <i id="mwpA">(pictured)</i> by the German U-boat <b id="mwpQ"><a href="./SM_U-21_(Germany)" id="mwpg" rel="mw:WikiLink" title="SM U-21 (Germany)">SM<span id="mwpw" typeof="mw:Entity"> </span><i id="mwqA">U-21</i></a></b> in 1914 was the first time a warship was sunk by a modern submarine?