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The Western film charts the four years of the Civil War in the late 1800s, exploring the conflict through

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the lens of the families, friends and foes who are trying to discover what it means to be the United States of America.

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UK viewers don't have long to wait, with Chapter One being released in cinemas on June 28 and Chapter Two following on August 16 — the same days as the previously announced US release dates

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UK viewers don't have long to wait, with Chapter One being released in cinemas on June 28 and Chapter Two following on August 16 — the same days as the previously announced US release dates

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The film boasts a star-studded cast including Stranger Things actor Jamie Campbell Bower, Dickinson's Ella Hunt, Anatomy of a Scandal's Sienna Miller, Avatar's Sam Worthington and The Hunger Games' Jena Malone.

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As well as starring in the blockbuster, Costner will also take on the role of director for the first time in 20 years.

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Horizon: An American Saga tells the story of that journey in an honest and forthcoming way, highlighting

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the points of view and consequences of the characters' life-and-death decisions," said Costner in a statement.