In August and September 1862 Confederate armies were on the move northward. Robert E. Lee was invading Maryland, Earl Van Dorn and Sterling Price were moving into Tennessee, and Braxton Bragg and Edmund Kirby Smith were advancing into Kentucky. James McPherson, in his acclaimed Battle Cry of Freedom, cites this period as the first of the four major turning points of the American Civil War. The Confederate counteroffensive defeated Union hopes to end the war in 1862. However, by mid-October, hard on the heels of the broad Confederate advance the Union forces had regained the strategic and...