Unfortunately, however, for the ambitious Italian, it was not long ere D'Epernon and Sillery recognized the error into which they had been led by their eagerness to injure him. They suddenly remembered that Concini had already once joined the faction of the Princes, and they were aware that the Duc de Bouillon had made more than one subsequent effort to induce him to abandon the royal cause; and they were no sooner convinced of the fault which they had committed, than they hastened to represent to the Queen that the appointment of the Maréchal d'Ancre to the command of the King's armies had caused great dissatisfaction throughout the capital; the citizens affirming that the troops of a sovereign of France ought not to be led against the enemy by a man who was ignorant of the art of war, and who was, moreover, a foreigner, detested by the people to an extent which rendered it probable that, should Concini be invested with the command, they would open the gates of Paris to M. de Condé, in the event of his marching upon the city. Marie de Medicis yielded to these reasons, and simply replied by reminding Sillery that if she had committed an error in accepting the proposal of the Maréchal d'Ancre, she had done so at his own instigation; but that as he considered it desirable to appoint some other individual to the command, she would offer no opposition. Concini was accordingly superseded, and the veteran Maréchal de Bois-Dauphin was selected as his successor, with the title of lieutenant-general.[201] Indignant at the disappointment to which he had been subjected, Concini left Paris, and proceeded to his government at Amiens, vowing vengeance against the Duc d'Epernon and Sillery. The impatience of the Queen to conclude the double alliance with Spain was so great that she disregarded the advice of Jeannin and Villeroy; who, in conjunction with Concini and his wife, had endeavoured to induce her to delay her departure for Guienne, and to proceed either to Laon or St. Quentin, in order to secure the Isle of France and Picardy, and to prevent the Prince de Condé and his adherents from concentrating their forces in the vicinity of the capital; while, on the contrary, she was urged by the Chancellor and his brother, the Commandeur de Sillery, who was her first-equerry and gentleman-usher, to carry out her original design. The 17th of August had been already fixed for the commencement of the royal journey; and Marie eagerly availed herself of their advice to persist in her purpose; contenting herself with giving orders to the Maréchal de Bois-Dauphin to cover Paris, to impede the approach of the disaffected forces, and, at all risks, to avoid coming to an engagement. She then withdrew from the Bastille eight hundred thousand crowns for the purpose of defraying the expenses of the Court during its progress.