There's a historical marker in the center of Chambersburg, Pennsylvania which states:
"Occupied the morning of July 30, 1864, by cavalry of Confederate Gen. John McCausland. Failing to obtain ransom, he burned the town [Chambersburg] in reprisal for ruin in the Shenandoah Valley by Gen. David Hunter"
Those were different days weren't they? A good history of the burning of Chambersburg can be found at: http://explorepahistory.com/hmarker.php?markerId=730
"McCausland's raid would be the last time that Confederates entered Pennsylvania during the Civil War. Jubal Early never regretted his decision to burn Chambersburg. And the Pennsylvanians who lived through it never forgot the raid. When McCausland died in 1927 at age ninety, some obituaries in Northern newspapers still referred to him as the 'Hun of Chambersburg.'"
Fear breeds hatred, hatred breeds anger, anger breeds violence, and violence, often—as in this case—breeds retaliation; and revenge. War truly is an ugly business. But at least people back then were willing to fight for what they believed in.