Red Badge of Courage, Gods and Generals, North and South (miniseries), Glory, of course, as a movie, going to focus more on a central story than a history lesson on battles though.
Gods and Generals , Gettysburg are a must see . These are part of the same Historians study . There is a 3rd part called Last full measure that may not get finished to release .
If you want a documentary i suggest looking up the civil war by Ken Burns . Youtube has a Ken Burns channel with all of them on it . Its a long series . 9 episodes about 1 1/2 hrs each