AmericanHeritage.com/Magazine
http://www.americanheritage.com/articles/magazine/ah/1973/5/1973_5_36....
This is a well-written article published in August 1973 by Liva Baker on the Burning of Chambersburg. An excellent account of the burning featuring the perspective of Colonel William Peters, a Confederate soldier who refused to obey his orders from McCausland.
Referenced in:
To Be or Not to Be: A Marriage of Civil War Descendants