HMS Sceptre
... that British submarine HMS Sceptre towed an X-class midget submarine tasked with attacking German battleships off Norway?
... that British submarine <b id="mwsg"><a href="./HMS_Sceptre_(P215)" id="mwsw" rel="mw:WikiLink" title="HMS Sceptre (P215)">HMS<span id="mwtA" typeof="mw:Entity"> </span><i id="mwtQ">Sceptre</i></a></b> towed an <a href="./X-class_submarine" id="mwtg" rel="mw:WikiLink" title="X-class submarine">X-class midget submarine</a> tasked with attacking German battleships off Norway?