Very nice video, and I agree that the older movies are much more epic than the computer generated movies they create now (with a few exceptions). It would be very interesting to see how well the Romans actually were able to rotate soldiers from front to back of the cohort during combat. It seems that it would lead to a natural giving of ground. I say this because logically it appear to be easier for the front unit to move back off the front and allow the second rank to assume the front of the formation from their current position as opposed to moving all the ranks behind moving up to fill the space of the now vacant front rank, but that is just pure speculation on my part. Would seem easier to coordinate 1 direction of movement as opposed to 2 directions while in combat nonetheless.