[Baalz]

Yes, but I just used that as a very commonly occurring case for illustration. The exact same mechanics work if you're using non-PD troops against, say an enemy pretender with a dom-10. Depending on the troops in question sermon of courage could certainly be better support than a mage. This is one example, but plenty a fight was won by once side sticking around one more turn. Certainly not always the case, but it's not that uncommon for sermon of courage to be very much carrying it's weight despite the opportunity cost of a mage.