George, I suggest East Tennessee and the Civil War by O P Temple available from Overmountain Press. Judge Temple went into detail about Gov. Ishom Greene Harris and the establishment of "Military Leagues" in Tennessee in 1860. There is a contempary pencil sketch of recruiters at either end of Gay St. in Knoxville in sight of each other signing up troops under the stars and stripes and the state flag. Those with CS sympathies had already began targeting prominate Unionists for arrest. Conversly the Unionists were not idle, they were not as well prepared as a military force but had prepared a basic network of resistance ie bridgeburners, pilots, and wholesale "stampeders".
Harris was not a desk bound executive. A S Johnson died in his arms and at that moment Harris' nephew Lt Pink Harris announced "Uncle Ishom, father is killed."
With the fall of Nashville Harris absconded with a large portion of the state treasury, but at the end of the war he returned all that he had taken.
Do a Google search on Harris I think you'll be able to find his bio and letters. Good Luck!
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