War n Peace: how can they be seperated?

In the book The Host by Stephenie Meyer an alien race ins taking over and inhabiting the people of earth and other planets in an attempt to make them more peaceful but the inhabitants resit angerly with war like tactics. This book reminds me of the war America is fighting today though i am not against it we interleaved soldiers into Iraq to assist in that countries liberation but we were met with a warlike force. Which in a way shows that no matter what tactics people use to create peace there will be some form of resistance some group who thinks what the "Peace Makers" are doing is wrong. So is it possible Preceding the second coming of Christ , to truly separate war from peace.