Apparently Phillips did write about his experiences at the Battle of Franklin, for I found this:

Dr. George C. Phillips, Surgeon for the 22nd Mississippi, watching the Battle with Surgeon W.B. Hall on top of a hill wrote, “This was the first and only time I ever heard our bands playing upon a battlefield and at the beginning of a charge…When within three hundred yards of their breastworks a cannon boomed from their fort (Granger) across the little river north of the town. This seemed to be the signal waited for. A sheet of flame and smoke burst from the entire crescent of the enemy’s breastworks, answered by the Rebel yell and musketry fire from our men. In a moment the whole valley was so filled with smoke that nothing could be seen but the flashes of cannon and musketry.”

I found this quote on the Battle of Franklin blog: http://battleoffranklin.wordpress.com/2006/12/