The mission President Adams declared was sent at one of the "most critical, important and interesting moments that ever occurred" in American history. Again was Barry given the old order so often given him during his Revolutionary career: "You will not capture anything on the voyage. This is a mortification to which it is necessary that you should submit. I hope to salute you an Admiral on your arrival at Philadelphia." Captain Barry performed the duty assigned him and landed the envoys in France. After long negotiations a Treaty of Peace, Commerce and Navigation was agreed to September 30, 1800, with the First Consul Bonaparte. It was ratified by the U.S. Senate February 3, 1801, by the French July 31, 1801, and proclaimed December 31, 1801. Washington died December 14, 1799. On the 20th Captain Barry received from the Navy Department a General Order of President Adams that all vessels should be "put in mourning one week by wearing their colors at half-mast high." The officers to "wear crape on the left arm below the elbow for six months." During the year 1800 the "United States" frigate was not in active duty--the trouble with France having ceased, other occasions for her services did not arise. Lieutenant Mullowney was promoted to the command of the "Ganges" and thirty-five of the seamen of the "United States" transferred with him. On July 16, 1800, Lieutenant Charles Stewart was given command of the "Experiment," Captain Barry expressing the hope that "he will be more active than he was," a hope which was justified in his subsequent career. At this time Barry's vessel was undergoing repairs. He wrote the Secretary, "she will not be out of the carpenter's hands until October." When she was ready for sea, Barry was directed "to proceed to St. Kitts and assume command of your squadron on the Guadeloupe station, taking under your convoy any merchant vessels ready to proceed for the Windward Islands; you have to protect our commerce to all the Islands and to guard our merchant vessels against all depredations from Porto Rico as well as from Guadeloupe and other dependencies of France." Later the Treaty of September 30, 1800, arrived, when Barry was directed to "treat the armed vessels of France, public and private, exactly as you find they treat our trading vessels." Up to that time seventy-four French vessels had been taken and more than eighty had been retaken from the French. This was regarded as ample proof of the value of a Navy and made its advocates so jubilant that "What think ye of the Navy now?" was tauntingly asked of its former opponents. So again Captain Barry's services as Head of the Navy were conspicuous and useful. But the Federalists, the party of Washington, of Adams and of Barry, were defeated by the election by the House of Representatives of Thomas Jefferson.