Richard,
Here's another one you may want to check on. I have no details of his death and only know of him because of researching Guerrillas in Vernon, my home county. The Gabbert band was well known there.
Gabbert, William, born 26 Jan 1814 Kentucky - died 16 Oct 1863 Benton County, Ark.
Lived in Montevallo, Vernon county, Missouri
Leader of a Bushwhacker Band in Vernon and adjoining counties that supposedly worked with Quantrill when he was in the area.
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Jim