It's July 1st, 1863 and one small town in Pennsylvania is about to have its name etched into American folklore, Gettysburg. Over the course of the next three days, over 165,000 troops from the union and the Confederate forces would engage in the bloodiest battle of the American Civil War, and despite the conflict continuing for nearly two more years, the Battle of Gettysburg is considered a turning point, marking the end of General Robert E. Lee's plans to invade the North and bring the war to a close.

But what if things had been different and this epic clash of the ages had turned out differently? Today we're delving back into the History Undone archives, as James Hanson is joined by historian and author Rear Admiral Dr Chris Parry, and Dr Timothy Orr, Associate Professor of military history at Old Dominion University.

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