Fort Mifflin is a historic military fort located on the banks of the Delaware River in Philadelphia, Pennsylvania. Built in 1771, it played a significant role during the American Revolutionary War, particularly during the 1777 defense against British forces. The fort's strategic position allowed it to protect the city and the river from enemy attacks. Today, Fort Mifflin is preserved as a historic site and museum, offering visitors a glimpse into its military history. The fort features original structures, reenactments, and educational programs that highlight its importance in American history. It is recognized as a National Historic Landmark.