Watch the full program here: video.pbs.org/video/2365036934/

Often described as the Civil War's turning point, the conflict took place over three days in and around the town of Gettysburg, Pennsylvania. It was the battle with the largest number of casualties in the war ultimately resulting in Union Maj. Gen. George Gordon Meade's Army of the Potomac fending off attacks by Confederate Gen. Robert E. Lee's Army of Northern Virginia, ending Lee's invasion of the North.

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