General Robert E. Lee's army was a surprise to almost everyone: With daring early victories and an invasion into the North, they nearly managed to convince the North to give up the fight. Astonishingly, after 150 years of scholarship, there are still some major surprises about the Army of Northern Virginia. Historian Joseph T. Glatthaar draws on sources assembled over two decades--from letters and diaries, to official war records, to a new, definitive...