Zane Grey 
To The Last Man [EPUB ebook] 

An ancient feud between two frontier families is inflamed when one of the families takes up cattle rustling. In the grip of their relentless code of loyalty, they fight a war in Tonto Basin, desperately, doggedly, neither side seeing the futility of the conflict. Surrounded by this volatile environment, young Jean finds himself hopelessly in love with a girl from whom he is separated by an impassable barrier.