Military exigencies now engrossed all thoughts, and the king's speech, in proroguing parliament on July 31, foreshadowed a new coalition, for which the murder of the Duke of Enghien had paved the way. The preparations for an invasion of England had been resumed, and Napoleon celebrated his birthday in great state at Boulogne, still postponing his final stroke until he should be crowned, on December 2, at Paris by the helpless pope, brought from Italy for the purpose.[27] A month later he personally addressed another pacific letter to the King of England, who replied in his speech from the throne on January 15, 1805, that he could not entertain overtures except in concert with Russia and the other powers. Meanwhile, Pitt, conscious as he was of failing powers, retained his undaunted courage, and while he was organising a third coalition, did not shrink from a bold measure which could hardly be justified by international law. This was the seizure on October 5, 1804, of three Spanish treasure-ships on the high seas, without a previous declaration of war against Spain, though not without a previous notice that hostilities might be opened at any moment unless Spain ceased to give underhand assistance to France. The excuse was that Spain had long been the obsequious ally of France, and, as the alliance now became open, Pitt's act was sanctioned by a large majority in both houses of parliament in January, 1805. The parliamentary session which opened in this month found Pitt's ministry apparently stronger than it had been at the beginning of the recess. Despairing of any help from Grenville, except in a vigorous prosecution of the war, he had sought a reconciliation with Addington, who became Viscount Sidmouth on January 12 and president of the council on the 14th. Along with Sidmouth his former colleague Hobart, now Earl of Buckinghamshire, returned to office as chancellor of the duchy. To make room for these new allies, Portland had consented to resign the presidency of the council, though he remained a member of the cabinet, while Mulgrave was appointed to the foreign office, in place of Harrowby, who was compelled by ill-health to retire.