Gen. Robert E. Lee began moving part of his Army of Northern Virginia from the Old Dominion toward Pennsylvania on June 3, 1863. Lee believed his army needed to win a major victory on Northern soil if the South was to have a chance at winning the war. Transferring the fighting out of war-torn Virginia would allow the state time to heal while he supplied his army from untapped farms and stores in Maryland and the Keystone State. Lee had also convinced Pres. Jefferson Davis that his offensive would interfere with the Union effort to take Vicksburg in Mississippi. The bold movement would trigger extensive cavalry fighting and a major battle at Winchester before culminating in the bloody three-day battle at Gettysburg.

Throughout northern Virginia, central Maryland, and south-central Pennsylvania, civilians and soldiers alike struggled with the reality of a mobile campaign and the massive logistical needs of the armies. Thousands left written accounts of the passage of the long martial columns. The coauthors mined hundreds of primary accounts, newspapers, and other sources to produce this powerful and gripping account. As listeners will learn, much of it is glossed over in other studies of the campaign, which cannot be fully understood without a firm appreciation of what the armies (and civilians) did on their way to the small crossroads town in Pennsylvania.