Col. Joshua Lawrence Chamberlain left behind a quiet life and a career as a college professor to fight for the Union. Gen. Thomas "Stonewall" Jackson was a man of great religious faith who served in the defense of the Confederacy. And Gen. Robert E. Lee, who led the Confederate army, was a man who was forced to choose between his loyalty to the United States and his love of the Southern states where he was born and raised. As Chamberlain, Jackson,...