Thanks for your information.
It seems that this must be a relative of Colonel David Jameson, since there were many David Jameson's from the same Jameson family of Virginia.
I recently purchase a book "The Jameson's in America" and I was able to put together many missing pieces.
I'm research now Lieutenant David Jameson, Co. "D", 14th Virginia Cavalry and should be able to find more information.
Is this Virginia in the Civil War message board you're referring to on another site or this site?
Thanks for kind help.