Thanks George.

All of the Union Tennessee units that were raised in East and West Tennessee with those geographic designators as part of their name (e.g.) 3rd West Tennessee Cavalry, got renumbered as the war went on. For example the 1st Middle Tennessee Cavalry was renumbered as the 5th Tennessee Cavalry US. The1st West Tennessee Cavalry was renumbered as the 6th Tennessee Cavalry US.

Not sure what number that the 3rd West Tennessee Cavalry would have been had it been fully raised and deployed as the number sequence is full through the 14th Tenenssee Cavalry (being the unit that held Fort Pillow when it was attacked by Forrest - erroneously called the 13th).

Greg Biggs