Virgil,
Nashville's Richland Creek runs into the Cumberland River near the bend west of downtown. it does run a bit parallel to US 70 but then turns south in Belle Meade west of White Bridge Road. There were CS units posted out there on December 15th. Wilson's Cavalry drove them from these positions in the initial push. There are some state historical markers there that talk about this.
Matt Ector's Brigade was one of the CS units posted there if I recall correctly and one of the cavalry brigades as well. Two of Ector's units carried Mobile Depot flags - the two North Carolina regiments. I will have to look and see what cavalry units were there to determine what flags they had. It may have been part of Jackson's Division in which case they all had Mobile Depot flags.
Greg Biggs