<P>The titanic three-day battle of Gettysburg left 50,000 casualties in its wake, a battered Southern army far from its base of supplies, and a rich historiographic legacy.</P><P>Thousands of books and articles cover nearly every aspect of the battle, but not a single volume focuses on the military aspects of the monumentally important movements of the armies to and across the Potomac River. One Continuous Fight: The Retreat from Gettysburg and the Pursuit of Lee's Army of Northern Virginia, July 4-14, 1863 is the first detailed military history of Lee's retreat and the Union effort to catch and destroy the wounded Army of Northern Virginia.</P>