In 1809, early in the year, Benjamin was sent to Vienna by his kinsman, Earl Bathurst, who was in the ministry of Lord Castlereagh, and, in October, Secretary of State for the Foreign Department. He was sent on a secret embassy from the English Government to the Court of the Emperor Francis. The time was one of great and critical importance to Austria. Since the Peace of Pressburg she had been quiet; the Cabinet of Vienna had adhered with cautious prudence to a system of neutrality, but she only waited her time, and in 1808 the government issued a decree by which a militia, raised by a conscription, under the name of the "Landwehr," was instituted, and this speedily reached the number of 300,000 men. Napoleon, who was harassed by the insurrection in the Peninsula, demanded angrily an explanation, which was evaded. To overawe Austria, he met the Emperor Alexander of Russia at Erfurth, and the latter when sounded by Austria refused to have any part in the confederation against Napoleon. England, in the meantime, was urging Austria to cast down the gauntlet. In pledge of amity, the port of Trieste was thrown open to the English and Spanish flags. In December, a declaration of the King of England openly alluded to the hostile preparations of Austria, but the Cabinet at Vienna were as yet undecided as to the course they would finally adopt. The extreme peril which the monarchy had undergone already in the wars with Napoleon made them hesitate. England was about to send fifty thousand men to the Peninsula, and desired the diversion of a war in the heart of Germany. Prussia resolved to remain neutral. Napoleon rapidly returned from Spain, and orders were despatched to Davoust to concentrate his immense corps at Bamberg; Massena was to repair to Strasburg, and press on to Ulm; Oudenot to move on Augsburg, and Bernadotte, at the head of the Saxons, was to menace Bohemia. It was at this juncture that Benjamin Bathurst hurried as Ambassador Extraordinary to Vienna, to assure the Cabinet there of the intentions of England to send a powerful contingent into Spain, and to do all in his power to urge Austria to declare war. Encouraged by England, the Cabinet of Vienna took the initiative, and on April 8 the Austrian troops crossed the frontier at once on the Inn, in Bohemia, in Tyrol, and in Italy. The irritation and exasperation of Napoleon were great; and Bathurst, who remained with the Court, laboured under the impression that the Emperor of the French bore him especial enmity, on account of his exertions to provoke the Austrian Ministry to declaration of war. Whether this opinion of his were well founded, or whether he had been warned that Napoleon would take the opportunity, if given him, of revenging himself, we do not know; but what is certain is, that Bathurst was prepossessed with the conviction that Napoleon regarded him with implacable hostility and would leave no stone unturned to compass his destruction.