Erik,
It is an honor to meet you. sorry I was deployed to Iraq, and been a victim of an ice storm so i apologize for being so slow in responding. The document I was in reference to was the John P Mann Diary currently housed at the Morris Library at SIU in Carbondale. I have misplaced my copies of the Roe letter specifically about the skirmish at Smithville. I believe I had the Mann diary in mind and thought it was a part of the Roe letters.
There is a description in one of the Lawrence County Historical Quarterlies that has a story of boys leaving the school to see the Regiment riding in town. I will need to make a copy of the article and send it to you.