[Endoperez]

Alternative approach could be Dryad Hoplites and various Fear effects. Thaumaturgy 3 and 4 give you Panic and Terror. You have mages capable of casting both. Both lower enemy morale. With low morale, they can't get past your Dryads' Awe.

Of course, you could always go for Enchantment and summon few Carrion commanders. They can reanimate manikins and other weird creatures for free.