>>96939608
Any game that has mechanics that illustrate this?

Often times in medieval and early modern warfare, the more armored and richer members of a unit would be in the front, and the less armored and poorer members would be in the back, so you can present a more heavy front while still bulking out the mass of a formation.

I think billhooks might have done something like that? but I think it was with archers and polearms, not sure about more and less armored infantry.

it would be a neat way to get a cheaper overall unit that initially has the same fighting power as a full heavy armor unit, but becomes a light armor unit after sustaining casualties or something.