We make war that we may live in peace.
Context / explanation
Nicomachean Ethics, bk. 10, ch. 7, sct. 1177b
To be prepared for war is one of the most effective means of preserving peace.George Washington
Peace: In international affairs, a period of cheating between two periods of fighting.Ambrose Bierce
War doesn't determine who's right - only who's left.Bertrand Russell
Mankind must put an end to war, or war will put an end to mankind.John F. Kennedy
You can no more win a war than you can win an earthquake.Jeannette Rankin