gun harmonisation
... that British Air Chief Marshall Hugh Dowding initially instructed his Spitfire and Hurricane groups to use a gun harmonisation scheme that aimed eight guns at a 12-foot-wide (3.7 m) rectangle?
... that British Air Chief Marshall <a class="mw-redirect" href="./Hugh_Dowding,_1st_Baron_Dowding" id="mwBwA" rel="mw:WikiLink" title="Hugh Dowding, 1st Baron Dowding">Hugh Dowding</a> initially instructed his <a href="./Supermarine_Spitfire" id="mwBwE" rel="mw:WikiLink" title="Supermarine Spitfire">Spitfire</a> and <a href="./Hawker_Hurricane" id="mwBwI" rel="mw:WikiLink" title="Hawker Hurricane">Hurricane</a> groups to use a <b id="mwBwM"><a href="./Gun_harmonisation" id="mwBwQ" rel="mw:WikiLink" title="Gun harmonisation">gun harmonisation</a></b> scheme that aimed eight guns at a <span about="#mwt32" data-mw='{"parts":[{"template":{"target":{"wt":"convert","href":"./Template:Convert"},"params":{"1":{"wt":"12"},"2":{"wt":"ft"},"3":{"wt":"m"},"adj":{"wt":"mid"},"4":{"wt":"-wide"}},"i":0}}]}' id="mwBwU" typeof="mw:Transclusion">12-foot-wide (3.7</span><span about="#mwt32" typeof="mw:Entity"> </span><span about="#mwt32">m)</span> rectangle?