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A vintage trade card featuring Union General George B McClennan leading his troops at the Battle of Antietam in Maryland during the American Civil War on 17th September 1862. The battle, though inconclusive, is considered to be the bloodiest single-day battle in American historyh with a combined tally of dead, wounded and missing of 22,717. (Photo by Popperfoto/Getty Images)

A vintage trade card featuring Union General George B McClennan leading his troops at the Battle of Antietam in Maryland during the American Civil War on 17th September 1862.  The battle, though inconclusive, is considered to be the bloodiest single-day battle in American historyh with a combined tally of dead, wounded and missing of 22,717. (Photo by Popperfoto/Getty Images)