That would be too late. By that time, you are checkmated, boxed into a corner.
Some care life in this world while others after this world.
Your enemy is hiding behind a rock and pick off your men using arrows from a distance, but you keep exhorting them to come out in the open and fight face-to-face. You can think enemy are cowards and immoral. But in the end, all of you will be killed.
I obviously can’t stop you from killing others outside your house, in the street, or elsewhere. But I wouldn’t recommend it, for many reasons. And no one is likely even threatening you right now, either.