Where were the words written for the star spangled banner?

Answer 1

The Battle of Baltimore in the War of 1812. British ships were bombarding Fort McHenry, where Francis Scott Key wrote the poem which would later become the national anthem.

More information: http://en.wikipedia.org/wiki/The_Star-Spangled_Banner

Answer 2

The star spangled banner was written on a British ship in the prison cabins at the battle of Fort McHenry, by Francis Scott Key.

Answer 3

During the War of 1812, after an overnight battle at Fort McHenry. (The original title of the poem was "The Defence of Fort McHenry".)