A couple corrections and answers for you:

>>>>>>>Fort Pillow, White units: 1st Battalion, 13th Tennessee Cavalry, 10 Officers and 285 men.

The white unit there was actually Bradford's 14th Tennessee Cavalry US - not the 13th. There was already a 13th in existence that was a different unit.

>>>>>Brice's Crossroads, curious if the 55th USCT or 59th USCT lost a flag or guidon.

Neither did.

>>>>18th USCT, Flag "Presented by the Colored Ladies of Murfreesboro" Captured at Nashville.

This is actually the 13th USCT flag and itw as their National colors.

Greg Biggs