[Mobhack]

A0 rallies everyone in contact with him in the A company as if a company commander.

A0 can rally any subordinate company commander if in contact.

A0 can rally subordinates of one of those companies, if he is within shouting distance (3-5 hexes or so). So if he wants to rally a routing herd, he has to get in amongst them. And then he might manage 1 or 2 rallies before failing one and his rally goes to 0 for the rest of the turn.

No magic to it really. And not worth agonising over. If he is close enough, he can do it sometimes - but its not 100% reliable.