Historical Sketch and Roster of The Tennessee 12th Cavalry Regiment (GreenÕs)The Tennessee 12th Cavalry Regiment [also called 1st Partisan Rangers] was organized behind Federal lines in February, 1863. The men were from the counties of Fayette, Tipton, Shelby, Haywood, and Gibson. It served R. V. Richardson's and Rucker's Brigade, confronted the Federals in Tennessee and Mississippi, and in October totaled about 300 effectives. Later it was active in Georgia, fought at Memphis, then was part of Hood's operations in Tennessee.