German Type IXB submarines
... that the German Type IXB submarines were the most successful class of submarines in World War II in terms of the total amount of tonnage sunk?
... that the <b id="mwDJ0"><a href="./German_Type_IXB_submarine" id="mwDJ4" rel="mw:WikiLink" title="German Type IXB submarine">German Type IXB submarines</a></b> were the most successful class of submarines in World War<span id="mwDJ8" typeof="mw:Entity"> </span>II in terms of the total amount of tonnage sunk?