Here's the story:
* During the War of 1812, Key witnessed the bombardment of Fort McHenry in Baltimore. He was a lawyer and amateur poet, and he was sent to negotiate the release of a prisoner of war.
* Key was detained on a British ship for a night. While watching the fierce battle unfold, he was inspired by the sight of the American flag still flying proudly over the fort despite the heavy bombardment.
* He wrote a poem titled "Defence of Fort McHenry" that night, which was later published in a Baltimore newspaper.
* The poem was set to the tune of a popular British drinking song called "To Anacreon in Heaven."
* The song quickly gained popularity and became known as "The Star-Spangled Banner." It was officially designated as the national anthem of the United States in 1931.
Key's poem and its musical adaptation have become iconic symbols of American patriotism and resilience. He is remembered as the author of the words that capture the spirit of the nation.