Romine Ostrander, born in 1837 in Roseville, Illinois, had made his way to Colorado as a private in the First Colorado Cavalry by the time he was twenty-five. On February 26, 1863, he bought a small, leather-bound diary; over the next three years he filled this volume and two more with his thoughts, travels, and frustrations. The delicate, well-worn diaries accompanied the private in his saddlebags over miles of dusty Colorado trails, but eventually...