People see Civil War ghosts all the time, primarily at battlefields - Gettysburg is particularly famous for it, though I don't know why it should have more ghosts than Shiloh or Antietam. Reports pre-date the establishment of re-enaction events, by the way!

Civil War era ghosts in Texas are less likely to be consciously associated with the war than with some other circumstance, though, because so few formal battles were fought here. Chipita Rodriguez, for example, was hung in 1863, but the fact that the war was going on at the time is not particularly relevant to her story so no one thinks of her as a Civil War era ghost.

I live in perpetual anticipation of learning that this or that Indian conflict, bushwhacker/home guard incident, or lynching occuring during this period has resulted in a haunting, but if (for example) Louis Schutze or any of the Haengerbande's other victims haunts Gillespie County, I have yet to hear of it.

(This is going off topic, so I've changed the header, hoping to bring some ghost stories out of the woodwork.)