Arleigh, the History of Cass County, MO did not list him that way that I found & neither did the census..1850 & 1860 Cass Co, MO Census lists him as farmer...I do not know other than what I see at this time..Hope it helps..

U.S. Civil War Soldiers, 1861-1865

Name: Bartlett Y. Brown
Side: Union Regiment State/Origin: Missouri
Regiment Name: Cass Co. Home Guard, Mo. Cav.
Regiment Name Expanded: Cass County Home Guard,
Missouri Cavalry COMPANY: C
Rank In: Private Rank Out: Sergeant Rank
Sergeant Film Number: M390 roll 6
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Soldiers' Records: War of 1812 - World War I

http://www.sos.mo.gov/TIF2PDFConsumer/DispPDF.aspx?fTiff=/archives/AdjutantGeneral/Civil_War/ServiceCards/s880/0845.tif&Fln=S60474.pdf
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Gay