Fremantle Fortress
... that during World War II, the Fremantle Fortress protected the second-most important Allied submarine base in the Pacific Theatre?
... that during World War<span id="mwBlg" typeof="mw:Entity"> </span>II, the <b id="mwBlk"><a href="./Fremantle_Fortress" id="mwBlo" rel="mw:WikiLink" title="Fremantle Fortress">Fremantle Fortress</a></b> protected <a href="./Fremantle_submarine_base" id="mwBls" rel="mw:WikiLink" title="Fremantle submarine base">the second-most important Allied submarine base</a> in the <a href="./Pacific_War" id="mwBlw" rel="mw:WikiLink" title="Pacific War">Pacific Theatre</a>?