After clearing Virginia's Shenandoah Valley of Federal troops, Gen. Robert E. Lee's bold invasion into the North reached the Maryland shore of the Potomac River on June 15, 1863. A week later, the Confederate infantry crossed into lower Pennsylvania, where they had their first sustained interactions with the civilian population in a solidly pro-Union state. Most of the initial encounters with the people in the lush Cumberland Valley and the neigh-...
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