[split] Distances between files and ranks

[Renatus]

As for Suetonius Paulinus, I would think he would deploy his men (within reason) to fit the width of the defile, rather than choosing only a defile that would fit a certain standard width of formation.

This is eminently sensible. The sorts of formation we have been discussing may well have applied in the open field. Within the confines of a defile, while the frontage might follow the same principles, the depth would depend entirely upon the number of soldiers and the width of the defile.