The Emperor was well aware of the reckless selfishness of the Emigrant princes. He had as little sympathy with them as his sister. He did not intend to listen to their demands. If he interfered in France at all, it would only be in a cautious and tentative manner, and in order to save Marie Antoinette and her husband. Certainly he would not undertake a war for the restoration of the Ancien Régime. The real inclinations of Leopold, with which Marie Antoinette generally concurred, pointed towards the summoning of a European Conference, to bring pressure to bear on the French Government, to strengthen the hands of the moderate parties in Paris, and to prevent any outrage on the King and Queen. Accordingly, the interviews at Pillnitz came to nothing. The Emperor and the King of Prussia did indeed enter into a treaty, binding them in certain events to make war together upon France. But the conditions of that alliance, which involved the joint action of all the European Powers, and in particular the co-operation of England which was known to be opposed to any form of intervention, rendered the treaty an empty form. Leopold himself assured his Chancellor that the Conference of Pillnitz had bound him to nothing, and the whole proceeding has been rightly described as one of the 'august comedies' of history. As time went on, the Emperor's determination to avoid war deepened. When, in September 1791, Louis accepted the new Constitution, Leopold took advantage of that event to make his position unmistakably clear. On the 1st November, he addressed a circular letter to the Powers, pointing out to them that Louis' action rendered any further interference impossible, and in spite of the angry protests of the Emigrants, the danger of war seemed to have disappeared.