Greek FireIn this illustration from a twelfth-century manuscript, sailors shoot Greek fire toward an attacking ship from a pressurized tube that looks strikingly similar to a modern flamethrower. The exact formula for Greek fire has been lost, but it was probably made from a petroleum product because it continued burning on water. Greek fire was particularly important in Byzantine defenses of Constantinople from Muslim forces in the late seventh century. (Prado, Madrid/The Bridgeman Art Library)