no we dont what we need are all the MAJOR units used by a civ, or all the MAJOR units that would have been used for a civ- takeing the Romans as an example, it is more important to get a Roman tank then it is to get a Roman chariot- becuase while the Romans at the
very beginning
might have used tanks in the style of the Mycenean Greeks, and other bronze age civilization around, its obvious they didnt use them on any scale beyond what the Myceneasns did- that use being not as an actual tool of war, but as a transport to take thechampions, and heros of the army from point to point on a battle feild to fight with opponents chamions- in other words making ll those heroic tales and epics we read about today happen in the first place
al lwhile the foot troops move ponderoussly across the battlefeild, under the lesser nobles, or middleclass men who act as the actual commanders of the army, and actually fight the battle....
while in contrast, at soem point a tank becomes
inevitable in some form, and it is garunteed to have a strong impact on Roman arms...
though to be honest, my current design for a Roman is shooting for the single period in time when
all options arer open to me- and I get to let my thoughts on how the Romans would have continued to have a strong use of infantry legions as the back bone of the army- supplemented by garrisons of specialty Auxilla for differnt locations in the empire- for example, lets a modern Rome has garrison duties in the Congo river basin- the very backbone of the garrison, say 15% would perhaps consist of actual legionasries, who in contrast would make the complete garrison of the central territories of the empire surrounding the med- its auxilliaries, equipped in a manner best suited to fight in the local terrain who woul dmake ou the mulk of the force- and for all real purposes, tanks are more less a cavalry wing attached when needed, but always present in some numbers eveywhere in the empire
. 
