Wake me at four o'clock. We're going to see some action. When the guns opened on Fort Sumter across the harbor in April of 1861, two young men, one white and one black, were watching together from the cupola of the big house on the Lawton plantation, which stretched for a full mile along the Ashley River near Charleston, South Carolina. The white man, Wallace Lawton, would shortly be plunged into a protracted, increasingly desperate struggle to retain...