On October 31, 1803, the frigate USS Philadelphia ran aground on a reef a few miles outside the harbor of Tripoli. After hours under fire, the Philadelphia , aground and defenseless, surrendered, and 307 American sailors and marines were captured. The bashaw ordered the crew moved into an old warehouse, and the officers were eventually moved to a dungeon beneath the Bashaw's castle. While the officers were treated as "gentlemen," although imprisoned, the sailors worked as enslaved laborers. The crew of the Philadelphia remained prisoners for nineteen months, until the Tripolitan War ended in June 1805.