But there were noble spirits in the American squadron who determined that this should not be. On the night of the 15th of February, 1804, Lieutenant Stephen Decatur, accompanied by seventy resolute men, entered the harbor of Tripoli, in a small schooner which he had previously taken and called the Intrepid, and succeeded in boarding the Philadelphia, then lying under the guns of the castle. In a few minutes the Tripoline crew were overpowered; many were killed, others swam to the shore, and communicated the astounding facts. A terrible fire was instantly opened upon the ship from the castle and batteries, aided by those of two vessels lying near; and it being impossible to carry off the Philadelphia, she was set on fire. The Americans retreated to the Intrepid; a breeze fortunately sprung up; they were soon beyond the power of their enemies, and reached the ship which awaited them, without losing a man. The Philadelphia was totally destroyed. This heroic achievement restored confidence to the Americans, and determined Commodore Preble to make a desperate attempt upon the city. His force had however been much reduced by the loss of the Philadelphia and the recall of other ships; and judging that an addition was necessary to afford any prospect of success, he proceeded to Naples, where he obtained from the King the use of two bomb vessels and six gun boats. These were strong, heavy, flat bottomed vessels, bad sailers, but manageable by oars, and well calculated for harbor operations. The gun boats mounted each a long twenty four pounder, and were manned by thirty-five men; the bombs carried thirteen inch mortars and forty men; several Neapolitan gunners and bombardiers were also engaged to assist in working them. The whole American force thus amounted to one frigate, (the Constitution,) three brigs, three schooners, two bombs, and six gun boats, carrying in all about one hundred and twenty guns, and one thousand and sixty men; and with this armament Preble appeared before Tripoli on the 25th of July, 1804. Yusuf was not however taken unawares, and he had made formidable preparations for resistance. The number of his troops in the city was supposed to be twenty-five thousand; the batteries mounted one hundred and fifteen pieces of cannon; besides which, the harbor was defended by nineteen gun boats, two gallies, two schooners of eight guns each, and a brig of ten guns.