The State of Ohio maintains a (free) website the source of which is:
Roster of Ohio Soldiers in the War of 1812. Adjutant General of Ohio. Transcription, 1916. R973.524471 A2. http://www.ohiohistory.org/resource/database/rosters.html
At the bottom of web page 121 and top of web page 122, are a list of men who served from August 24, until September 24, 1812, in a unit of unknown county, headed by a Capt Daniel Kain.http://www.ohiohistory.org/onlinedoc/militaryroster/1812/txt...http://www.ohiohistory.org/onlinedoc/militaryroster/1812/txt...
On the second page are listed:
In an endeavor to find the county that this unit could belong to, I refer to the subscription service ancestry.com's database for early 1800 Ohio Tax Lists (many of early 1800's US Federal Census records for Ohio have been lost), and find:http://search.ancestry.com/search/db.aspx?dbid=3567
Capt John Kain - in Clermont Co, Ohio, 8 tax lists from 1806-1810
John Earhart - in Clermont Co, Ohio, 8 tax lists from 1806-1810
Jasper Shotwell - in Clermont Co, Ohio, 7 tax lists from 1806-1810.
I also looked up some other members of the unit at random and found all but one of this sample to be from Clermont Co. The one who wasn't from Clermont Co was from Washington Co.
Note that Brown County was later formed from Adams and Clermont Counties.
Conclusion: That this John Earhart is the John Earhart found in the 1820 census in Williamsburg Twp, Clermont Co, Ohio and in 1830-1850 censuses in Pike Twp, Brown Co, Ohio (probably did not move - different locations likely from boundary change).
These two men had descendants who included 3 children from Benjamin Earhart who married 3 grandchildren of Jasper Shotwell (children of John Shotwell). (Unless the Jasper Shotwell in the War of 1812 muster list is a child or grandchild of the Jasper Shotwell, patriarch of the Clermont /Brown County Shotwells (1757-1816))
Benjamin Earhart md Sarah Shotwell, 2nd wife
Adam Earhart md Nancy Shotwell
John Earhart md Margaret Shotwell
I am descended from the above Benjamin Earhart and his first wife, Rebecca Donalson.
I find other references for John Earhart and Jasper Shotwell in this War of 1812 website, but haven't been able to ascertain if they are the same men, so I don't know if they spent anymore than the one month of this muster roll in the War of 1812.
My web page for John Earhart is:http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=REG&d...
Any information on his ancestry would be appreciated.