The most well-known method of using napalm for war is from air-dropped incendiary bombs. A lesser-known method is the flame throwers used by combat infantry. Flamethrowers use a thinner version of the same fuel to destroy prepared locations of guns, bunkers and cave hideouts. U.S. Marines fighting on Guadalcanal found them very effective against Japanese positions. The Marines used fire as both a weapon to cause damage as well as a psychological weapon. Men have a natural fear of fire. They found that Japanese soldiers would abandon positions when napalm was used. Prisoners of war confirmed that they were scared of napalm more than any other weapon thrown at them.