Joseph Bruchac 
Brothers of the Buffalo [EPUB ebook] 

A captivating and historical story of two young men on opposing sides of war. In 1874, the U.S. Army sent troops to subdue and move the Native Americans of the southern plains to reservations. Brothers of the Buffalo follows Private Washington Vance Jr., an African-American calvaryman, and Wolf, a Cheyenne warrior, during the brief and brutal war that followed. Filled with action and suspense from both sides of the battle, this is a tale of conflict and unlikely friendship in the Wild West.