The Battle of Derne was the decisive victory of a mercenary army led by a detachment of United States Marines and Soldiers against the forces of Tripoli during the First Barbary War. It was the first recorded land battle of the United States fought overseas. U.S. forces and mercenaries marched for 600 miles (970 km) through the desert to attack Derne. In 1804, the former Consul to Tunis, William Eaton, returned to the Mediterranean with the title of Naval Agent to the Barbary States. Eaton had been granted permission from the United States government to back the claim of Hamet Karamanli. Hamet Karamanli was the rightful heir to the throne of Tripoli and had been deposed by his brother Yussif Karamanli. Upon his return to the area, Eaton sought out Hamet Karamanli who was in exile in Egypt. Upon locating him, Eaton made a proposal to reinstate him on the throne. The exile agreed to Eaton's plan. Commodore Samuel Barron, the new naval commander in the Mediterranean, provided Eaton with naval support from the USS Nautilus, the USS Hornet and the USS Argus. The three vessels were to provide offshore bombardment support. The Nautilus was commanded by Oliver Hazard Perry, the Hornet was commanded by Samuel Evans, and the Argus was commanded by Isaac Hull. A detachment of U.S. Marines was given to Eaton under the command of First Lieutenant Presley O’Bannon. Eaton and Hull made their base of operations at Alexandria, Egypt. There, with the help of Hamet Karamanli, they recruited about 500 Arab and Greek mercenaries. Eaton named himself general and commander-in-chief of the combined force. On March 6, 1805, General Eaton began to lead his army on a 600 miles (970 km) trek across the Libyan desert. Their objective was the port city of Derne, the capital of the province of Cyrenaica. Supplies and money were promised to the largely mercenary force when they reached the city. During the 50-day trek, Eaton became concerned with the relationship between the Christians and the roughly 200 or 300 Muslim mercenaries in his force. On several occasions mutiny threatened the success of the expedition. Between March 10 and March 18, several of the Arab camel drivers mutinied before reaching the sanctuary of the Massouah Castle. From March 22 to March 30, there were mutinies of several of the Arab mercenaries under the command of Sheik el Tahib. On April 8, upon crossing the border from Egypt into Libya Tripoli, General Eaton had quelled the Arab mutinies. The force finally reached the port city of Bomba in late April, up the coast from Derne, where the Argus, the Nautilus and the Hornet along with Captain Hull were waiting. There Eaton and his force received supplies and money to pay the mercenaries. Battle On the morning of April 26, Eaton sent a letter to the governor of Derne, Mustafa Bey, asking for passage through the city and supplies, though Eaton likely knew that these were terms that the governor could not accept. Mustafa reportedly wrote back, "my head or yours!". On the morning of April 27, Eaton observed a fort in Derne with eight guns, and he believed that the majority of the population would be in favor of Hamet. The Argus sent a cannon ashore for use in the attack. Hull's ships opened fire and bombed Derne's batteries for about an hour. General Eaton divided his army into two separate attacks. Hamet would lead the Arabs southwest to cut off the road to Tripoli and then attack the left flank of the city and storm the more weakly defended governor's palace; meanwhile Eaton with the rest of the mercenaries and Marines attacked the harbor fortress, while Hull and the other ships opened fire on the heavily defended port batteries. At 2:45 p.m. the attack began with Lt. O'Bannon and the Marines in the lead. O'Bannon led the Marines and 50 Greek cannoneers with the field piece from the Argus, though after about 45 minutes the gun's effectiveness was decreased after the crew left the ramrod in the tube and shot it away. The harbor defenses had been reinforced and the attackers were momentarily halted; this however allowed the Arab mercenaries sent to cut the road to Tripoli to ride unopposed into the western section of the city. Eaton saw his mercenary army in confusion from the enemy's musket fire, and that a charge would be the only way to continue the attack. At this time he was seriously wounded in the wrist by a musketball. From the Argus, Hull observed the Americans and mercenaries "gaining ground very fast though a heavy fire of Musquetry [sic] was constantly kept upon them". The ships cut their fires during the charge. Eaton reported that O'Bannon and his Marines and Greeks "pass'd through a shower of Musketry from the Walls of houses, took possession of the Battery".

• published: 27 May 2015
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