S W Wiley
If you are researching Wiley ancestors from the Civil War era, e-Bay has a listing for the letter of S W Wiley to his mother written while he was serving in Kentucky in 1862.
The letter has an imprint of Abraham Lincoln on top, so it would seem like a safe bet that S W was a Union soldier.
I was using "Perryville" as a search term when I found the letter.