In 1812 Fort McHenry was attacked by the British, Scott Francis Key saw the flag still flying over the fort at dawn and wrote a poem about it. In 1812, William Congreve invented a rocket bomb that was used in the battle. In 1802, Congreve began experimenting with rockets, trying the make the best rockets. He bought the biggest rocket in London, and it didnt go far, but he kept trying to make them go further. Congreve finally succeeded, making the rockets go far, and adding more explosives, he used them on Fort Mchenry, but America still won the