Southend on Sea
4. In what way do the Commander attack when they left alone(a Commander in a hex)? Like normal units?
It helps to think like this: each figure on the field does not represent one soldier - each model stands for a dozen or so men. The leader figure does not therefore stand for just the leader - it stands for the leader PLUS a dozen or so men, his bodyguard.
Apart from his ability to command, a solitary leader figure is no different to a solitary trooper figure.