Defence-class ironclad
... that the British Defence-class ironclad was considered by the naval architect Sir Nathaniel Barnaby to have only one quarter the combat value of the preceding Warrior class?
... that the British <b id="mwC1Y"><a href="./Defence-class_ironclad" id="mwC1c" rel="mw:WikiLink" title="Defence-class ironclad"><i id="mwC1g">Defence</i>-class ironclad</a></b> <i id="mwC1k">(pictured)</i> was considered by the <a class="mw-redirect" href="./Naval_architect" id="mwC1o" rel="mw:WikiLink" title="Naval architect">naval architect</a> Sir <a href="./Nathaniel_Barnaby" id="mwC1s" rel="mw:WikiLink" title="Nathaniel Barnaby">Nathaniel Barnaby</a> to have only one quarter the combat value of the preceding <a href="./Warrior-class_ironclad" id="mwC1w" rel="mw:WikiLink" title="Warrior-class ironclad"><i id="mwC10">Warrior</i> class</a>?