One hundred and forty years ago this month, 100,000 Union soldiers marched into Georgia. Less than eight months later, the Yankees captured Savannah. Along the way, they fought more than 20 major battles, crushed Confederate resistance, destroyed at least $100 million worth of railroads, warehouses, plantations and factories, and left Atlanta in smoking ruins. It remains one of the most famous military campaigns in American history: Gen. William Tecumseh Sherman's March through Georgia. It's still taught to cadets at West Point as an example of how to break an enemy's will to fight. And without the trauma of Yankees plowing...