A few days ago 'Guest' advised us to "kill the enemy anyway you can" and this has rather preyed on my mind. It occurs to me that this is a regrettable and justifiable necessity if you are defending your country or territory from invaders (although it is not something to be gloried in!).
If, on the other hand, you are an invader and you use excessive force which inflicts death, injury and mutilation on innocent non-combatants you are a war criminal!