“Horizon: An American Saga- Chapter 1” (*1/2 out of four) was a grueling “epic” Western chronicling a 15-year span of pre-and-post Civil War expansion and settlement in the American west in which a settler (Angus MacFayden), a lieutenant (Sam Worthington), a sergeant (Michael Rooker), a grizzled colonel (Danny Huston), and a retired gunslinger (Kevin Costner) all intersect. Ambitious story is also long-winded and incredibly dull as it plods on for over 3 hours; Costner is dull too and also directed and incorporates many elements from his earlier “Dances With Wolves” and “Open Range” but the film this may remind you most is “Heaven’s Gate.” Supposedly, 3 additional entries are planned.