Armadillo
... that the Armadillo, an armoured fighting vehicle extemporised by the British in 1940, used a layer of gravel to protect its crew?
... that the <b id="mwqg"><a href="./Armadillo_armoured_fighting_vehicle" id="mwqw" rel="mw:WikiLink" title="Armadillo armoured fighting vehicle">Armadillo</a></b>, an armoured fighting vehicle <a class="mw-redirect" href="./Extemporise" id="mwrA" rel="mw:WikiLink" title="Extemporise">extemporised</a> by the British in 1940, used a layer of <a href="./Gravel" id="mwrQ" rel="mw:WikiLink" title="Gravel">gravel</a> to protect its crew?