This area of Ohio has a lot of history most of it in some way connected with the civil war. The Rankin House, written about in "Uncle Tom's Cabin" and part of the underground railroad, is in Brown county too. As a matter of fact there are many homes in the area that were used as safe houses for the underground railroad...including my Aunt and Uncle's.
If you would like to know more the Internet is packed with info on the civil war, Grant and Morgan's raid. I did find a few sites that might be of interest:
Ulysses. S Grant
John H. Morgan