An army in a conflict zone cannot ensure peace. Because this peace is taking place only due to the force of the gun. It is not real peace. It exists merely on the surface.
Real peace exists in the minds of men. It exists amongst peace loving people. People who breathe human values and respect the right of their fellow citizens to practise their faith, beliefs, and values. They practise their own, but are not insecure at someone else following something else. This is the characteristic of peaceful people. Unless this happens, society will live in tension.
Peace must exist with the minds and hearts of people. This is real peace. Peace cannot be forced.