The Rise of the Roman Legions

After the triumph of augustus, legionary garrisons were posted on the frontiers to monitor the borders. Domitian and hadrian cemented this mission by literally building walls to demarcate the empire from barbarian lands beyond. The utility of these lines though, was premised on the notion that the romans would always have superiority of numbers in the local theatres of operation. But by the late second century, this assumption of nume rical superiority became a dangerous fallacy. And for most of the next century, as we saw add nauseum in the last 15 episodes or so, the local legions stopped being a match for the invasion forces that now vastly outnumbered them