Meanwhile cardinal Alberoni employed all his intrigues, power, and industry, for the gratification of his revenge. He caused new ships to be built, the sea ports to be put in a posture of defence, succours to be sent to Sicily, and the proper measures to be taken for the security of Sardinia. He, by means of the prince de Cellamare, the Spanish ambassador at Paris, caballed with the malcontents of that kingdom, who were numerous and powerful. A scheme was actually formed for seizing the regent, and securing the person of the king. The duke of Orleans owed the first intimation of this plot to king George, who gave him to understand that a conspiracy was formed against his person and government. The regent immediately took measures for watching the conduct of all suspected persons; but the whole intrigue was discovered by accident. The prince de Cellamare intrusted his despatches to the abbé Portocarrero, and to a son of the marquis de Monteleone. These emissaries set out from Paris in a post-chaise, and were overturned. The postillion overheard Portocarrero say, he would not have lost his portmanteau for a hundred thousand pistoles. The man, at his return to Paris, gave notice to the government of what he had observed. The Spaniards, being pursued, were overtaken and seized at Poictiers, with the portmanteau, in which the regent found two letters that made him acquainted with the particulars of the conspiracy. The prince de Cellamare was immediately conducted to the frontiers: the duke of Maine, the marquis de Pompadore, the cardinal de Polignac, and many other persons of distinction, were committed to different prisons. The regent declared war against Spain on the twenty-ninth day of December; and an army of six-and-thirty thousand men began its march towards that kingdom in January, under the command of the duke of Berwick.