I did a Goggle William Mahone Battle of Burgess Mill
and found the following which may be it

DePevster, J. W. "A Military Memoir of William Mahone, Major General in the Confederate Army," Historical Magazine (1871)

http://books.google.com/books?id=SdrYv7S60fgC&pg=PA1244&lpg=PA1244&dq=William+Mahone+Battle+of+Burgess+Mill&source=bl&ots=lXYxwNOyQA&sig=VTnHVB9a1XteWCtdWdCIm-2z8Qg&hl=en&ei=AqmBSqqbBZHYsgPYmdWICQ&sa=X&oi=book_result&ct=result&resnum=3#v=onepage&q=&f=false

This memoir is found at: http://books.google.com/books?id=skGeGikQMwIC&pg=PA20&lpg=PA20&dq=William+Mahone+Battle+of+Burgess+Mill&source=bl&ots=0S8ELWWe2I&sig=LlF4lEUiQ_348rFvSeWmyzOvCaM&hl=en&ei=8ayBSpCxO4rosQPWlJiECQ&sa=X&oi=book_result&ct=result&resnum=9#v=onepage&q=&f=false