Prof. Allen Guelzo's Gettysburg: The Last Invasion was reviewed in the July 3 Boston Globe.
From the Globe:
On successive days in early July of 1863, the Union Army won two decisive victories — at Gettysburg on the 3d after three days of bloody fighting, and at Vicksburg on the 4th after a crushing seven weeks’ siege.
They did not end the war, but they should have.
The stage was being set for Gettysburg in late June of 1863, and as the Confederate Army headed north out of Virginia, there was “a skylarking spirit” as the troops waded across the Potomac River and headed toward Pennsylvania.