The head of the war party in the Assembly was Brissot, who was reputed to know foreign countries, and who promised certain success, as no really formidable Power was ready to take the field. Meantime he endeavoured to isolate Austria, and Segur was sent to Berlin, Talleyrand to London, to surround France with her natural allies. Brissot's text was the weakness and division of other countries; the first man who divined the prodigious resources and invincible energy of France was the declamatory Provencal Isnard. He spoke on November 29, and this was his prophetic argument: the French people exhibited the highest qualities in war when they were treated as slaves by despotic masters; there was no fear that they had degenerated in becoming free men; only let them fight for principle, not for State policy, and the force that was in them would transform the world. Herault de Sechelles divulged the political motive of the war party. He said a foreign conflict would be desirable for internal reasons. It would lead to measures of precaution stronger than peace time would admit, and changes otherwise impossible would then be justified by the plea of public safety. It is the first shadow cast by the coming reign of terror. But neither Girondin violence nor _emigre_ intrigue was the cause that plunged France into the war that was to be the most dreadful of all wars. The true cause was the determination of Marie Antoinette not to submit to the new Constitution. At first she wished that France should be intimidated by a congress of the united Powers. She warned her friends abroad not to be taken in by the mockery of her understanding with the Feuillant statesmen; and when Leopold treated the accepted Constitution seriously, as a release from his engagements, she accused him of betraying her. On September 8, just before accepting, Lewis, in confidence, wrote that he meant to tolerate no authority in France besides his own, and that he desired to recover it by foreign aid. The idea of an armed Congress persisted until the end of November. But during the week from the 3rd to the 10th of December the king and queen wrote to the Powers, desiring them not to regard their official acts, beseeching them to resist the demands they made in public and to make war, and assuring them that France would be easily subdued and cowed. They hoped, by this treason, to recover their undivided power. All these letters were inspired, were almost dictated, by Fersen.