Upon entering the navy, in March of the year named, Decatur joined the frigate United States, under command of Commodore Barry, who had obtained the warrant for him. He served with Barry until promoted to a lieutenancy. The United States needed repairs, and not wishing to stay in port, Decatur applied for orders to join the brig Norfolk, then bound to the Spanish Main. After one cruise he returned again to port and resumed his station on the United States, where he stayed until our naval troubles with France terminated. He was next ordered to the Essex and sailed with Commodore Dale's squadron to the Mediterranean. Returning home once more, he was appointed to the New York, one of the second squadron under command of Commodore Morris. When he again came back, he was ordered to command the Argus, to proceed with her to join Commodore Preble's squadron in the Mediterranean, and on his arrival there to resign the Argus to Lieutenant Hull and take charge of the schooner Enterprise, then commanded by that officer. The exchange being made, Decatur sailed to Syracuse where the squadron was to rendezvous. There he learned of the disaster to the Philadelphia. That frigate, as the reader will recall, ran aground while blockading Tripoli (with which country we were at war), and was captured by the Turks. Commodore Bainbridge and his crew of more than three hundred, among whom were Porter, Jones, and Biddle, were made prisoners and immured in a gloomy dungeon. Decatur quickly formed a plan for capturing or destroying the frigate. Preble, to whom the proposal was submitted, refused at first to give his consent, but his impetuous lieutenant won him over and was allowed to lead the expedition. Decatur selected the ketch Intrepid, which he had captured a few weeks before, and manned her with seventy volunteers, chiefly his own crew. He sailed from Syracuse, February 3, 1804, accompanied by the United States brig Siren, Lieutenant Stewart, who was to aid with his boats and to receive the crew of the ketch, should it be found expedient to use her as a fireship. The weather was so tempestuous that it required fifteen days to reach the harbor of Tripoli. It was arranged by Decatur and Stewart that the ketch should enter the harbor about ten o'clock that night, attended by the boats of the Siren. A change of wind threw the Siren six or eight miles away from the Intrepid, and, fearing to wait for the boats, Decatur decided to adventure alone in the harbor, which he did about eight o'clock. The Philadelphia lay within one-half gunshot of the Bashaw's castle and of the principal battery; two of the enemy's cruisers were only a couple of cables' length away on the starboard quarter, and their gunboats were within one-half gunshot on the starboard bow. All the guns of the frigate were mounted and loaded.