 In 1926, Mussolini passed a law allowing the Fascist Grand Council to decide the succession, though in practice he admitted the prince would succeed his father.An attempted assassination took place in Brussels on 24 October 1929, the day of the announcement of his betrothal to Princess Marie José.Umberto was about to lay a wreath on the Tomb of the Belgian Unknown Soldier at the foot of the "Colonne du Congrès" when, with a cry of 'Down with Mussolini!