It soon became evident that the designs of France were not unknown at St. James's. The celebrated Chauvelin, Secretary of State to Louis the Fifteenth, had long been employing his influence over the Cardinal Fleury to counteract the wishes of the English. By a slight accident his designs were disclosed to Queen Caroline. Chauvelin had, unintentionally, among other papers, put into the hands of the Earl of Waldegrave, then ambassador in France, a letter from the Chevalier. Lord Waldegrave immediately sent it to Queen Caroline. This involved a long correspondence between Sir Robert Walpole and Waldegrave on the subject. "Jacobitism," to borrow the language of Dr. Cox, "at this time produced a tremor through every nerve of Government; and the slightest incident that discovered any intercourse between the Pretender and France occasioned the most serious apprehensions."[19] The spirit of insurrection and discontent had long pervaded not only the capital, which was disturbed by frequent tumults, but the country; and the murder of Porteous in Edinburgh, in 1736, was proved only to be the result of a regular systematic plan of resistance to the Government.[20] The death of Queen Caroline deprived the oppressed Jacobites in both kingdoms of their only friend at Court. The unfortunate of all modes of faith met, indeed, with protection and beneficence from that excellent Princess. Those Roman Catholics, whose zeal for the Stuart cause had exposed them to the rigour of the law, were succoured by her bounty; large sums were sent by her to the indigent and ruined Jacobite families; and Sir Robert Walpole, who was greatly disturbed at this show of mercy to the delinquent party, truly exclaimed, "that the Jacobites had a ready access to the Queen by the backstairs, and that all attempts to suppress them would be ineffectual."[21] The last efforts of Walpole, then Lord Orford, were exerted to warn the country of the danger to be feared in that second invasion, for prognosticating which he had so often been severely ridiculed. He alluded to "the greatest power in Europe, which was setting up a Pretender to the throne; the winds alone having hindered an invasion and protected Britain." He warned the Lords, that the rebellion which he anticipated would be "fought on British ground." The memorable oration in which he unfolded these sentiments, which were delivered with great emotion, touched the heart of Frederic Prince of Wales; who arose, quitted his seat, and, taking Lord Orford by the hand, expressed his acknowledgments.[22] That warning was the last effort of one sinking under an excruciating disease, and to whose memory the tragedy of 1715 must still have been present.