Rome, June 10 (AP, via radio).—-A. declaration of war has been given to the ambassadors of France and England, Benito Mussolini said today.Premier Mussolini told the Italian nation “an hour important to the destiny of Italy has now begun.5’Mussolini, speaking from a balcony of the Palazzo Venezia overlooking the Piazza Venezia, jammed with cheering, shouting members of the Fascist party, soldiers and civilians, said:“Our conscience is perfectly tranquil.55 The crowds in the piazza roared approval.All the world knows, he said, that It ah- has tried in vain forI *peace.M4‘The Allies should not have repulsed the peace offers made bv Hiller.7’ he shouted.