According to the letters of the men making the campaign, you did. There was a fair amount of looting, a lot of foraging, a few threats to burn cities if the inhabitants didn't come up with a specified amount of supplies, and several hundred free blacks rounded up and sent south to slavery. Lee was forced to write a special order condemning the actions, but it was widely ignored. It was the fact that the southern forces spent so little time in Pennsylvania before being defeated and forced to retreat that kept the damage minimized.
You know quite well that the only documented example is Chambersburg. Lee gave orders that looting, etc. would be punishable by DEATH. Which he enforced.