What was the name of the fortress taken in the Battle of Tripoli?

The fortress taken in the Battle of Tripoli was indeed the Fortress of Derna. This battle, which occurred during the First Barbary War in 1805, was part of a larger conflict between the United States and several North African states, primarily over issues of piracy and trade. The capture of Derna was significant because it marked a decisive moment in asserting U.S. military presence and influence in the Mediterranean region.

The Fortress of Derna was strategically important due to its position and the role it played in controlling access to the region. The successful takeover by U.S. forces helped to demonstrate their resolve against piracy and solidified their reputation as a new power willing to defend its interests abroad. This event is often highlighted as a pivotal moment in U.S. military history, showcasing the determination and adaptability of American forces during that period.

In contrast, the other choices—The Fortress of Gibraltar, The Fortress of Algiers, and The Fortress of Cairo—relate to different historical contexts and conflicts, thus not being associated with the events of the Battle of Tripoli.