They allowed the Americans to return to their own vessel but continued guarding them. Key's tactics were successful, but because he and his companions had gained knowledge of the impending attack on Baltimore, the British did not let them go. It was another chapter in the ongoing War of 1812.Ī week earlier, Francis Scott Key, a 35-year-old American lawyer, had boarded the flagship of the British fleet on the Chesapeake Bay in hopes of persuading the British to release a friend who had recently been arrested. The bombardment, known as the Battle of Baltimore, came only weeks after the British had attacked Washington, D.C., burning the Capitol, the Treasury and the President's house. On a rainy September 13, 1814, British warships sent a downpour of shells and rockets onto Fort McHenry in Baltimore Harbor, relentlessly pounding the American fort for 25 hours.