Fort McHenry is a historical American coastal pentagonal bastion fort on Locust Point, now a neighborhood of Baltimore, Maryland. It is best known for its role in the War of 1812, when it successfully defended Baltimore Harbor from an attack by the British navy from Chesapeake Bay on September 13–14, 1814. The fort was built in 1798 and was used continuously by U.S. armed forces through World War I and by the United States Coast Guard in World War II. It was designated a national park in 1925, and, in 1939, was redesignated a U.S. National Monument.