In the earliest days of warfare the terms ordnance and artillery were used to describe both guns and ammunition. Arrows and bows were considered part of the same system. Ammunition is the word used to describe the things that go into the barrel, both to fire the weapon, and to do damage when it arrives at the target. A gun or rocket or even an aircraft is only a way of delivering that weapon onto its target. No weapon frightens me as much as the shell.
Bullets have a certain logic.
Put a sizeable enough piece of concrete between yourself and the firer and you will be untouched . And there is no real cover from shellfire.