Watch Horizon: An American Saga - Chapter 1 for Free: How to Stream the Movie Online at 123Movies. . Follow the story of how the Old West was won—and lost—through the blood, sweat and tears of many. Spanning 15 years before, during and following the Civil War from 1859 to 1874, embark on an emotional journey across a country at war with itself, experienced through the lens of families, friends and foes all attempting to discover what it truly means to be the United States of America.