man of the hour occurs whenever there are situations where you fight against the enemy using an army with no general and that unit provides the little extra push needed to win. Probably occurs mostly when you are outnumbered. Also, there has to be no nearby friendly large sized army(bigger than the enemy army). its like they become man of the hour because they saved the faction from a large problem(hence the no nearby large army because if the enemy won, then your faction would have a problem).
Is the code for this changeable? I can't find it.