During World War I the Genoese shipyards were very active, importing vast quantities of materials necessary for the war effort, and between thirty thousand and eighty thousand Genoese left for the battlefront. About this period we have to remember the admiral Raffaele Rossetti, famous for the sinking of the battleship SMS Viribus Unitis. Important urban and architectural works were constructed under Fascism including: Piazza Dante which includes the Piacentini's Tower, Piazza della Vittoria with itsArco della Vittoria, and the Bisagno stream water tunnel. In 1935, the only synagogue built during the fascist period, the Synagogue of Genoa, was inaugurated.