Kevin Costner stars in the upcoming 4-part movie series 'Horizon: An American Saga'
First part set for release on June 28, 2024
New teaser shows Costner on horseback firing bullets at the camera
'Horizon' explores the allure and myth of the Old West
Films span the four years of the Civil War from 1861 to 1865
Promises an emotional journey across a divided nation
Costner directs the movies in addition to starring
Part 1 arrives in theaters June 2024, Part 2 in August 2024