Below is a video that Tim sent me (thanks Tim!) about the Roman military. Very informative! Below that, I am including a clip from Gladiator. Be sure to look out for where the battle takes place, the contrasting styles of the barbarian and Roman armies, and the great line about "knowing when they are conquered" (as we said, the Germanic barbarians never surrendered to the Roman Empire). The final clip is the actual battle scene which you should only watch if you are not squeamish about blood and violence.