A rocket vessel was a ship equipped with rockets as a weapon. The most famous ship of this type was HMS Erebus, which at the Battle of Baltimore in 1814 provided the "rockets' red glare" that was memorialized by Francis Scott Key in The Star-Spangled Banner. The Congreve rockets of this period were highly inaccurate and unreliable, and were primarily used as a psychological weapon of terror in conjunction with other, more effective, weapons, such as mortar shells thrown by bomb vessels. Modern warships carry a variety of rocket-powered missile weapons.