Read "Gettysburg" by Stephen Sears, "Gettysburg: A Testing of Courage" by Noah Andre Trudeau and "Retreat from Gettysbug: Lee, Logistics, and the Pennsylvania Campaign" by Kent Masterson Brown for detailed accounts of what Lee's troops really behaved like. With Lee's blind eye if not full support.
I'm going to check those books out. You have to wonder what mayhem Lee's hordes would have committed had Lincoln and Meade abandoned Pennsylvania to the rebs like the glorious defenders of Dixie did to South Carolina. If you're going to presume to call yourself an independent nation, you do not march away from a large enemy force invading your heartland. I think people upset about SC need to blame Jeff and Hood instead of Sherman.