Hi Ricunni
Sorry my friend, but I have to pull you up on that one. Your talking about a period that goes from 281BC to 86 BC. You cannot compare Roman armies from the start and end of this period as it saw radical change not only in the content and formation of the Roman army but also in tactics. I don't have time right now to go into detail but I'll write a proper description and post up later. The subject of Roman infantry manipular tactics and the Phalanx is indeed an interesting one though.