Factual error: The balloon that the Union soldiers escape in has no mechanical burner of any type in it that would be needed to keep the craft aloft in the air. A balloon flies by heating the air inside the bag, causing it to rise up. It descend as it cools.
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Suggested correction: Gas balloons (using Hydrogen or Helium) large enough to carry passengers were invented in the late 1700s. Gas-filled observation balloons (such as the one in this film) were, in fact, used during the Civil War.
