Gustav
... that the first report of the D–Day landings received in the British mainland was delivered by Gustav, a messenger pigeon?
... that the first report of the <a class="mw-redirect" href="./Normandy_Landings" id="mwEcE" rel="mw:WikiLink" title="Normandy Landings">D<span id="mwEcI" typeof="mw:Entity">–</span>Day landings</a> received in the British mainland was delivered by <b id="mwEcM"><a href="./Gustav_(pigeon)" id="mwEcQ" rel="mw:WikiLink" title="Gustav (pigeon)">Gustav</a></b>, a messenger pigeon?