[QUOTE=BMalion]
You called? 
My major nitpick with most Roman military portrayals in tv/cinema is that the soldiers predominantly wore white/off white tunics, not red.
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Yeah. Dear directors and artists everywhere: red dye was expensive. You wouldn’t deck out common foot soldiers in anything red. Rome gets this part right.
Anyway, I went and had another look at the Philippi scene (thanks, YouTube ). You can see a bit more than what I remembered, though as I said, it’s a bit messy. There are units of different shapes and sizes , and you can’t really make out a formation. It does, however, mostly resemble what the article I linked to calls the “articulated phalanx”, with narrow gaps in the line, which certainly seems to be the most realistic option. Also, I was complaining about the lack of arrows and missile troops, but oddly enough, it turns out that this might be right for this particular battle. What is portrayed appears to be the second of the two engangements that made up the battle of Philippi , and according to Wiki: “The battle resulted in close combat between two armies of well-trained veterans. Arrows or javelins were largely ignored and the soldiers packed into solid ranks fought face-to-face with their swords”. So there you go. The action does cut from one side carrying their pila, to the other side just holding their swords, to the clash. This is a bit weird, like the director couldn’t figure out where to put the pila. Also, the way Brutus kills himself in the end by charging the enemy troops isn’t accurate. He certainly did kill himself, but according to Plutarch, it was by the more convential method of falling on his sword. However, one guy who *did *die like that, according to Plutarch, was Marcus Porcius Cato II, son of the famous Cato. He refused to retreat when the troops routed and charged the enemy without armor. So it seems that *Rome *conflates those accounts.
Apparently, the Wikipedia entries for each episode of Rome has a section with inaccuracies and errors (I sure already knew that there are plenty). That’s pretty cool. I think I shall be doing some reading…
The Philippi scene certainly does illustrate the problems with all theories about troop rotation. Sure, it’s all fine in theory, but how would it work in a real battle, when you have the front line all hacking and slashing at each other, with dead, wounded and confused men everywhere? How do you avoid your formation all turning into one big mess?