Little Wolf, left, shakes hands with White Bull in front of Col. Fitzhugh Lee, other 7th Cavalry officers and civilians in June 1926 during the 50th commemoration of the Battle of the Little Bighorn. (Courtesy of the National Park Service, Little Bighorn Battlefield National Monument)The following excerpt is reprinted with permission from the new book “Celebrating Custer’s Last Stand: 150 Years Commemorating the Battle of the Little Big Horn,” b…