The Tennessee State Library and Archives provides a brief history of Tennessee units during the War of 1812. We can see the commanding officer, the unit captains, where the volunteers came from by county, the dates the unit was active, and several paragraphs of history. In all, about 37 units are listed.
If you have Tennessee ancestors who fought in this war, the site will be a benefit for general background.
Tennessee Department of State: Tennessee State Library and Archives:
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