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Revealing mistake: When the 54th Mass. marches past a liberated plantation some black children wave them on. One of them is wearing a digital wristwatch.
Revealing mistake: Rubber bayonets quiver every time the Federal troops hit the sand for protection during the climactic assault on Fort Wagner. It sort of wrecks the mood.
Answer: The Battle of Antietam, also known as the Battle of Sharpsburg. It took place 9/17/1862. 3,675 men lost their lives, with an additional 17,301 wounded that day.
Bishop73