For a half century, John Ellis Wool (1784-1869) was one of America's most illustrious figures--most notably as an officer in the United States Army during the War of 1812, the Mexican-American War, and the Civil War. At the onset of the Civil War, when he assumed command of the Department of the East, Wool had been a brigadier general for twenty years and, at age seventy-seven, was the oldest general on either side of the conflict. Courage...