Originally Posted by Maeran
Since all the more recent books on the subject that I've read (all popular books, I'm not an expert on the subject and do not pretend to be) distance themselves from the idea of successive invasions (and more recent genetic studies suggest that most of the population of Britain hasn't moved very far at all since prehistory), the ethnicity traits for the Casse as I understand them contradict what at least looks like the current majority view- every trait I've read so far gives an approximate century that the tribe concerned migrated from Gaul, and they are all 800BC and younger, so far as I've seen.
Of course I could be mistaken. Perhaps the idea of a series of immigrations from Gaul has made a comeback. Perhaps the invasion idea was retained because the game is Total War, and not Total Farming, so descriptions inclined toward the dramatic.