I think the closet thing to a historically accurate film I've seen was the Life of Brian.
I have this feeling things weren't that far off from that
Otherwise I have a very hard time finding any truly 'accurate' movies. All tend to combine multiple people into one character, ignore what doesn't translate easily to the camera that sort of thing.
Hell even when it would be good film like the Battle of Sterling, they decide showing how it really happened would be too expensive so instead make up some silliness with pikes vrs cavalry.
At best you can get a feel for the time, but much like they butcher a good novel, history gets butchered just as badly.