When you level the F*** out of (lets say) a city with the largest non-nuclear armnments by carpet bombing.used as a last resort and to demorolise troops. Using heavy bombs such as M.O.A.B's. destruction brought to you by a squadran of bombers which you could not run away from.
watch clover field. in the end the repeat on the radio of a "hammerdown" procedure as a last resort to deal with the monster