Flamethrowers are potent weapons with great psychological impact upon unprepared footsoldiers, inflicting a particularly horrific death of being burnt alive, and are also used against battlefield fortifications, bunkers, and other infantry protected emplacements. They are not so effective against armoured vehicles like tanks and are, naturally, useless against aircraft. It should be noted that China invented an even more deadly substance named Black Napalm, with a classified mixture. Black Napalm produced an even more intense heat, with the result of far deadlier firestorms.