A 1936 American war film directed by Lew Ayres based on events in the American Civil War and starts with citizens choosing loyalty to the Confederate States of America or to the Union in the first days of the crisis. Early scenes show the burning of the USS Merrimack by its Union crew to prevent it from falling into Confederate hands. However, the Merrimack, which had been burnt down to the waterline, was later rebuilt by the Confederacy, as an ironclad, and was renamed the CSS Virginia. Film is in the public domain in the United States.
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https://www.youtube.com/watch?v=mc4bYiCIXU8