[gila]

Well,It really all boils down to simple factors,mainly player preferences,time period,maybe forces involved perhaps.

There is no formula on the "correct" map size,too many factors and one players config. may not be what you'd like.

If the battle seems to cramped,then increase map size or minamize your forces to your prefernce,vicevera,if too many gaps ect.

Trial and error,again,is the thumb rule here.