Pluton-class minelayers
... that the Pluton-class minelayers, built just before World War I, were the first purpose-built minelayers in the French Navy?
... that the <b id="mwDIU"><a about="#mwt45" class="new" data-mw='{"parts":[{"template":{"target":{"wt":"sclass","href":"./Template:Sclass"},"params":{"1":{"wt":"Pluton"},"2":{"wt":"minelayer"}},"i":0}},"s"]}' data-mw-i18n='{"title":{"lang":"x-page","key":"red-link-title","params":["Pluton-class minelayer"]}}' href="./Pluton-class_minelayer?action=edit&amp;redlink=1" id="mwDIY" rel="mw:WikiLink" title="Pluton-class minelayer" typeof="mw:Transclusion mw:LocalizedAttrs"><i>Pluton</i>-class</a><span about="#mwt45"> </span><a about="#mwt45" href="./Minelayer" id="mwDIc" rel="mw:WikiLink" title="Minelayer">minelayers</a></b>, built just before <a href="./World_War_I" id="mwDIg" rel="mw:WikiLink" title="World War I">World War I</a>, were the first purpose-built minelayers in the French Navy?