The Greek authorities were frustrated that he could not provide an exact estimate of the number of attendees more than a year in advance. In France, Coubertin's efforts to elicit interest in the Games among athletes and the press met difficulty, largely because the participation of German athletes angered French nationalists who begrudged Germany their victory in the Franco-Prussian War. Germany also threatened not to participate after rumours spread that Coubertin had sworn to keep Germany out, but following a letter to the Kaiser denying the accusation, the German National Olympic Committee decided to attend. Coubertin himself was frustrated by the Greeks, who increasingly ignored him in their planning and who wanted to continue to hold the Games in Athens every four years, against de Coubertin's wishes. The conflict was resolved after he suggested to the King of Greece that he hold pan-Hellenic games in between Olympiads, an idea which the King accepted, although Coubertin would receive some angry correspondence even after the compromise was reached and the King did not mention him at all during the banquet held in honour of foreign athletes during the 1896 Games.