At this juncture he took Lafayette into his confidence as he had already done so many times, and discussed the situation with him. The Marquis saw at once another opportunity to be of service to America. He had hardly left Jefferson's house before the idea came to his mind that he could offer his services as chief of the operations against the Barbary pirates, and he wrote at once to Jefferson to that effect.[169] That the project did not come to completion was due to many causes and to a large extent to Adams' opposition, as may be inferred from a letter written by Lafayette to his "Dear General" during the fall of 1786,[170] but most of all to lack of coöperation between the European powers; and during the rest of his mission Jefferson had to restrict himself to making arrangements in order to obtain the release of the American captives. On the other hand, if it was evident that Europe was unwilling to coöperate with America in the Mediterranean, it was not so certain that France, England, and Spain had given up their ambitious designs on the New World, and Jefferson considered it his duty to forestall any attempt of theirs to develop or reëstablish colonies on the American continent. As far as France was concerned, she had given up all claims to her former colonies by the Treaty of Alliance signed on February 6, 1778, but there always remained the possibility that she might attempt to settle on the western coast of the American continent and thus take possession of the back door of the country. The preparations made for "La Peyrouse's voyage to the South Seas" aroused strong suspicions in Jefferson's mind. He could not be persuaded that the French were in a position to spend so much money "merely for the improvement of the geography of that part of the globe." They certainly had some ulterior aims, at least that of establishing fur-trading stations on the western coast, as a first step towards regular colonization; and "if they should desire a colony on the western side of America, I should not be quite satisfied that they would refuse one which should offer itself on the eastern side," wrote Jefferson to Jay. So, to ascertain the true nature of the expedition, he commissioned Paul Jones to go to Brest "to satisfy himself of the nature of the expedition; conducting himself so as to excite no suspicion."[171] This was not a very important incident in itself, but it is not impossible that it attracted Jefferson's attention to the western coast fifteen years before he sent out the Lewis and Clarke Expedition; and his unwillingness to permit France to obtain a footing even in a very remote part of the continent is quite significant.