Contrary to most historians, Dr. Samuel W. Mitcham Jr. posits that it was the Battle of Vicksburg, not Gettysburg, that was the true turning point of the Civil War. Learn about the tumultuous Battle of Vicksburg and why Grant and Lincoln considered it's capture essential in our interview with Dr. Mitcham about his new book, "Vicksburg: The Bloody Siege That Turned the Tide of the Civil War."