Anti-War
This is not a Pro-Union/Anti-Confederate film.
While I do think there were a lot of things Wirz could have done, I realize some things were beyond his control, and there is a scene that shows Henry Wirz in a sympathetic light, a line that points out Federal prison camps are no better then Andersonville, and there are several good Southerners and bad Northerners presented in the movie.
I think the reason why Andersonville gets the attention it does is because more men died there then any other prison camp, and the film is just telling their story. The movie is very honest, and no one group or person really gets blamed for the mistreatment of the prisoners. It is sadly all apart of the hades that is war.
"Andersonville" is more of an anti-war film in my view.