@daum3ns I'm not trying to say that you *should* end a war with weapons.
There is a subset of War Studies, War Termination, that looks at how wars end, which I discovered after reading your post.
Wars often end through demonstrations of force in battle that lead to negotiations or outright surrender - and that can come through more weapons.
Increasingly there are attempts to reach a negotiated peace without that - but they require both sides to have good faith.