George Henry Thomas was once considered the most successful general in the Civil War. Now, however, he has been nearly forgotten by historians. Born and raised in Virginia, Thomas graduated from West Point and without hesitation fought for the North, only to be disowned by his Southern family and distrusted by the Northern generals above him. Yet in death, five years after the war, he was honored with a national cortege from California to New York; 10,000 mourners attended his funeral, including...