This is intellectually dishonest. There is no comparison between the Confederate and Union forces. The former generally strictly avoided abuses against civilians; the latter used total war on women and children to such a marked degree that Sherman and other Union generals would be guilty of war crimes and crimes against humanity had there been any tribunal and authority to compel a trial. Marching through Pennsylvania on the way to Gettysburg, General Lee gave strict orders not to take civilian property without compensation or harm civilians. I remember some Confederate officers were punished for merely taking fence posts to use as firewood.
Chambersburg was an exception to the rule and in response to Northern atrocities. I notice that Yankees are not above making up facts as McPherson does regularly to reinforce their arguments. Shame on you, Sir!
On the contrary, Lee was forced to issue his General Order 73 on June 28th, several weeks after the campaign began, precisely because soldiers under his command had been looting private homes and atacking civilians. And even with the order, foraging of food and cattle was permitted. For every soldier you claim was punished for taking firewood, a thousand other went unpunished for stealing family silverware. Letters from Confederate soldiers confirm this.
Other towns had been threatened during every southern campaign in the North and all were forced to pay extortion to keep form being burned. Chambersburg was an exception only because the local population could not come up with the ransom McCausland demanded. It is was a 'response to Northern atrocities' then those 'atrocities' couldn't have been much if the Confederate army could have been bought off.