Generally any sort of weapon, be it bombs, live ammo or hell anything that rains down upon the earth and causes mass death and devastation. Also known as Raining Death.
1. During the Vietnam War, the ground troops were usually attacked from entrenched enemies from all sides, so the called in artillery and bombers to drop some death from above on the dinks. And during the battle of Hamburger Hill, instead of bombing the thing, they decided to send human soldiers up the hill. In 10 days the divisions that went up that hill suffered over 70% casualties.