The winners declare their dead as heroes while the losers are declared as criminals. However all the deceased soldiers lie in each other's arms beneath the ground. Their spirits continue to fight and suffer on the battlefields for years.
There is no logic or meaning to the phrase "war for peace" as it is a fallacy. The expression "war for peace" is as meaningless as the expressions of "die for life" "suffer for pleasure" or "be unhappy for happiness."
Today's person is in an inner war a state of internal chaos because they are a complete victim of the illusion. The person must overcome one's inner chaos in order to attain peace.  Yet if someone offers that person consolation it is like treating that person as the enemy because consolation is a waste of time that does not lead to peace.  
If one does not fight the war inside then the person will be forced to fight outside. However if a person enters a war inside fights wins and ends the war then the war outside also ends. This is the only way to reach peace!