Several light vessels are ordered to be equipt for the American service. They are intended for conveying ammunition, provisions, &c. from the ships of war and transports to the different parts of the coast, for the use of the government troops. Lord [Richard] Howe is to have the command of the fleet against the Americans, and his brother being commander by land, the most spirited conduct is expected next campaign. Last Wednesday Capt. [John] Macartney was appointed to the command of his Majesty's frigate the Ambuscade, of 32 guns, at Chatham.