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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 the Chesapeake Bay on September 13–14, 1814. It was first built in 1798 and was used continuously by the U.S. armed forces through World War I and by the Coast Guard in World War II. It was designated a national park in 1925, and in 1939 was redesignated a "National Monument and Historic Shrine". During the War of 1812 an American storm flag, 17 by 25 feet (5.2 m × 7.6 m), was flown over Fort McHenry during the bombardment. It was replaced early on the morning of September 14, 1814, with a larger American garrison flag, 30 by 42 feet (9.1 m × 12.8 m). The larger flag signaled American victory over the British in the Battle of Baltimore. The sight of the ensign inspired Francis Scott Key to write the poem "Defence of Fort M'Henry" that was later set to the tune "To Anacreon in Heaven" and became known as "The Star-Spangled Banner", the national anthem of the United States.
