i do not know the name of the group, or many of the words, but the ending, after the battle:
    the valley people, after killing the mountain people, turned over the 'stone' to get the treasure:

             "peace on earth was all it said"

   i leave the details to someone else.


This is "One Tin Soldier," by Coven. It is played over the opening credits sequence of the film Billy Jack. Great song.