No one makes an invasion without reconnoitring beforehand the country to be invaded; and Prince Louis Napoleon’s emissaries had already ascertained that at Boulogne, at Calais, at Saint-Omer, and at the great military centre of Lille, there were officers ready to cast in their lot with his. According to Louis Blanc, Prince Louis Napoleon’s intention was, after securing the adhesion of the Boulogne garrison, to march upon Calais, whence he was to make his way to Saint-Omer. But the better-informed Count Orsi, who took part in the expedition, and was one of the prince’s most trusted friends, tells us, in a valuable little volume devoted to the subject, that the plan of campaign was to march from Boulogne straight to Saint-Omer. The point to be reached after Saint-Omer was in any case Lille; and if the garrison of Lille had once been secured, the prince’s enterprise would have been far, indeed, from hopeless. To return once more to Louis Blanc--that brilliant, sensational, but by no means accurate historian. Prince Louis Napoleon was, according to his account, encouraged in his hazardous project by Lord Palmerston; not because that statesman believed in its success, but because he knew that it must inconvenience and possibly injure Louis Philippe, whose policy he detested. Louis Blanc also holds, in connection with the Boulogne expedition, that the French embassy in London was kept well informed as to the progress of the enterprise, but did not interfere because, anticipating with confidence a complete failure, it looked upon this fiasco as destined to have a strengthening effect on the existing Government, certain at once to suppress it. However all this may have been, Louis Napoleon’s friends engaged for him, in the month of July, 1840, a steamer named the _Edinburgh Castle_. On the 4th of August the arms, ammunition, and baggage were taken on board at Gravesend, where the vessel remained for some little time. Here it was that the famous eagle, which has become the subject of a ridiculous legend, was brought on board. An officer of the party who had gone on shore happened to meet with a youth who was offering an eagle for sale. Struck by the appropriateness of the bird, he determined, more in a jocular than in a superstitious spirit, to purchase it and place the expedition under its auspices. It was afterwards pretended that the eagle had been trained in London to fly round the head of Prince Louis Napoleon; this gyration, according to Louis Blanc, being caused by the bird’s knowledge that a piece of bacon was secreted beneath the rim of his master’s hat.