During the First Barbary War, the United States Navy brig , commanded by Lieutenant Isaac Hull, brought food and supplies to the Gulf of Bomba on 16 April 1805 for a ground force commanded by Consul William Eaton. Eatons force, consisting of himself, eight United States Marines, and a group of mainly Arab allies, traveled more than 500 miles (805 km) from Egypt to attack the state of Tripoli, which was holding as hostages and slaves about 300 Americans from the U.S. Navy frigate captured when "Philadelphia" had run aground in Tripoli Harbor in October 1803. The supplies received from "Argus" enabled Eatons force to win the Battle of Derna – which began on 27 April 1805 – and take control of Derna, the largest city in what was then eastern Tripoli.