GDG- A Gettysburg period newspaper question - post-battle tours

[Biggsk at aol.com]

Hello one and all,
 
Since we have been chatting about wartime newspapers for a bit, it brought  
to mind a question regarding something for the Gettysburg battlefield.  Let  me 
set the stage first.
 
A year or so ago I was asked to speak to the Evansville, In CWRT and, it  
being only 2 hours from me, I went up early to work with the wartime newspapers  
of the city for the day.  I stumbled across an ad from the local steamboat  
company dated within two days after the capture of Ft. Donelson (Feb. 16,  
1862).  The ad offered a tour of the Ft. Donelson battlefield as an all-day  
excursion and then listed the times of departure in the mornings plus the  rates.  
The same company did the same thing after Shiloh in April, although  this was 
an overnight tour. 
 
My question is, what was the earliest time after July 3, 1863 that anyone  
has come across a business entrepreneur offering tours of the Gettysburg  
battlefield?
 
Greg Biggs