Frances Scott Key was a 35-year-old Washington lawyer who'd been opposed to America's entry into the War of 1812 from the beginning. But on the evening of September 13, 1814, he found himself watching as a prisoner on a sailing ship deck as the ships of the world's mightiest navy rained shot and shell down on Fort McHenry, a small fort protecting the city of Baltimore.
The British, having set Washington on fire and raided Alexandria, began heading north toward Baltimore, where they met a Royal Navy fleet headed in from the Chesapeake Bay. They launched their bombardment in the rain.