Having played through my first full campaign, I was wondering about the effects of army command radius, on units under that army's command.
I know that if you want to attach a corp to an army, then it has to be within the command radius of the army commander (displayed by pressing shift), and that the benefits of becoming attached to an army include the improvement of command structure, which can negate or reduce penalties relating to a shortage of command points within the Corps. However, if an attached Corps then travels beyond it's army commanders command radius, there doesn't seem to be any real detrimental effect to that force (ie: command penalties don't seem to reappear).
I assume there should be penalties to operating out of range, but how do they become apparent in game? Or, can a Corps pretty much go where it likes, without penalties, once it has become attached?