During the War of 1812 a 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 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 become known as the “Star Spangled Banner”, that was adopted as the national anthem of the United States in 1931. (Sourec: Wikipedia) Also Note: feature photo was downloaded from Internet.
I visited the place yesterday and fully enjoyed the display of Visitor Center, especially the well-done 10-minute video, make sure you watch toward the end when the screen rolls up and what in front of you is the star shaped Fort!