(Picture I) Kimmo Huosionmaa Flamethrowers are classified as the "inhumane weapon", and they are prohibited to use in war since World War I when they made the most terrifying injuries for the troops in both sides. But the fire is one of the most effective weapons in the world because of humans afraid fire naturally, and this makes this horrifying weapon one of the most effective weapons in history. Big size heavy flamethrowers were in the key role in the defense and offense in many battles in the WWI. The weapon was prohibited in the same contract with the chemical weapons. But this contract was the "dead letter", and in the WWII both axis and allies used flamethrowers in their campaigns, and especially Germans published many pictures about men who were used this weapon. And United States army used that weapon against Japanese in the Pacific campaign. Flamethrowers played a big role in the battle of Iwo Jima and also Germans used that weapon in the Easter