Please I'm not defending this movie, yet...
I believe at this stage, I assume around AD 410, the Romans had been using the Saxons to fight the Picts and Scots for at least several decades. I think the Saxons engaged the Picts as far north as the Orkneys. Again, because of the sever manpower shortages throughout the Empire, and the practise of Senatorial class that in effect further removed huge numbers of people from being used by the Imperial state, the Roman military was forced to use outsiders.
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