mages versus orcs

The question is, what did I do wrong???????

With such a limited set of spells, the Mage has no options. What illusions can be used to defeat an Orc with the "holy word" when there are almost three hundred Centaurs? As I understand it, you played with only one Castle. The root of the failure lies in the development itself. Was it worth taking those schools of magic if the Magic Tower didn't offer anything useful for them? Without higher-level Dark Magic, everything is, of course, sad, but you could have taught some spells like "Eagle Eye" (since "education" is already available) and obtained others as perks (the "Protection" skill gives "Stone Skin"). About the battle itself: why are the Mage's units behaving so passively? In this case, there is no hope for magic. I would change the Hero. Against the Orc, Ogre looks weak (Rezak, Narhiz), but that's just my personal preference.