The larger story arc is purely speculative, but IMHO, the details stoke the atmosphere for what it must have been like on a remote outpost on the outer frontier of civilisation and beyond. The primary plot line, a young centurion redeeming his family name and the honor of his father and father's legion was well written and acted.
I read her series of books, starting with Eagle of the Ninth, when I was early in my high school years. It is of course a work of fiction, and showbiz doesn’t make documentaries. The trouble with Caledonia in Roman times was, that Calendonia wasn’t very much trouble at all. If it had been, the Romans would have just cleaned the whole place out, which is what they did in Jutland.
http://www.freerepublic.com/focus/chat/3058753/posts?page=15#15
Good movie, but It is more likely that the 9th was defeated during the Bar Kokba rebellion in 132 AD
That was a good movie. The Druid rituals seemed realistic.
Rosemary Sutcliff’s books are worth reading.