[Saxon]

Everyone here has been talking about the straighforward, blow them away, kind of magic. Also experiment with some of the other spells. Body Ethereal was mentioned, a very nice spell. Also look at Destruction (in the demo) which turns enemy armour to mush. Protection has a long range and can help, though it is not as powerful. Strenght of Giants can also help your forces hit a lot harder, while Fear can make your enemy run. The power of this type of spell is not so obvious, but if you are suffering less causulties and scattering your enemy, you will end up on top after a few turns.