Maybe in this regard we have a different approach and that is why I was not getting your point. Some historians think that legions fought with espaces (as wide as the maniples themselves) between the maniples whereas others think that the posterior centuria advanced to close the gaps and form a solid line. The second one fits the description I put from Livy for the triarii and personally that sounds more convincing to me.rbodleyscott wrote:
But that would misrepresent the frontage of the legion, because although the maniples are 8 ranks deep, they have maniple size gaps between them. So if you represent the hastati and principes as separate BGs, they should only be 1 base deep to represent the correct frontage including the gaps as well as the maniples.
Hence the original play-test model.
In fact I was rather thinking about combat lines than maniples. Whether we take one or another there is a bottom line: the triarii could close the front for the whole legion and I assume they did by halving the depth of the ranks if we believe Livy when he says that they formed a single compact line. Right now in FoG the frontage of the combined hastati and principes cannot be covered by the triarii and you have to use tricky geometry to support the units. If all your legions flee, you have to calculate how to position all your triarii, scattered all over, to cover the retreat of your army.
In the other hand, if you try to depict combat lines (triplex acies) by a legion of 2x2 (velites) 2x2 (hastati) 2x2 (principes) 2x1 (triarii), the geometry not only fits perfectly, but you solve the problem of the frontage. In the other hand, if you believe that legions had those gaps and thus you group hastati and principes, in order to be consistent you have to double the depth of the BG's. If we assume that prior and posterior centuries fought as a compact body with gaps among maniples, thus your BG have to represent 4 centuries deep. That would meand that the BG's should be 1x4 and 1x4. What happens right now in FoG is that hastati and principes are placed side by side and that is why triarii are mouving around in the vacuum trying to fill gaps in column.
In the other hand I think that interpenetrations for triarii and at least Marian and Early Imperial legions should be allowed. I can't see reasons against that.