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Virtually all of the extras who play soldiers in the film were members of Civil War Re-enactor groups who not only freely donated their time but also supplied their own uniforms and equipment. This ensued that the film-makers did not have pay for their own extras and that they could stage the massive battle scenes without blowing the budget. See more...
Gettysburg (1993) - 4 major mistakes
Directed by Ronald F. Maxwell, starring Martin Sheen, Stephen Lang, Tom Berenger (add more)