On a chilly January morning in 1872, a special visitor arrived by train in North Platte, Nebraska. Grand Duke Alexis of Russia had already seen the cities and sights of the East--New York, Washington, and Niagara Falls--and now the young nobleman was about to enjoy a western adventure: a grand buffalo hunt. His host would be General Philip Sheridan, and the excursion would include several of the West's most iconic characters: George Armstrong...