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, , 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, . 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. History 18th century Fort McHenry was built on the site of the former Fort Whetstone, which had defended Baltimore from 1776 to 1797. Fort Whetstone stood on Whetstone Point (today's residential and industrial area of Locust Point) peninsula, which juts into the opening of Baltimore Harbor between the Basin (today's Inner Harbor) and Northwest branch on the north side and the Middle and Ferry (now Southern) branches of the Patapsco River on the south side. The Frenchman Jean Foncin designed the fort in 1798, and it was built between 1798 and 1800. The new fort's purpose was to improve the defenses of the increasingly important Port of Baltimore from future enemy attacks. The new fort was a bastioned pentagon, surrounded by a dry moat—a deep, broad trench. The moat would serve as a shelter from which infantry might defend the fort from a land attack. In case of such an attack on this first line of defense, each point, or bastion could provide a crossfire of cannon and small arms fire. Fort McHenry was named after early American statesman James McHenry (1753–1816), a Scots-Irish immigrant and surgeon-soldier. He was a delegate to the Continental Congress from Maryland and a signer of the United States Constitution. Afterwards, he was appointed