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This really interested me when I read it. How exactly did the army attack your wiccan foe? And how bad? Did this person die? Or was it more of a mental thing? What did the wiccan do to you?
The fact that the nec spell book says specifically that the names to evoke such a force are so volitile and the fact that the change can mean literal death is why I would never try this. On top of that its the god form that controls the army (a god's will is greater than man's). If by chance it happens to view you as unjust it may turn the army on you.
Though it is interesting and I believe it is possible to use for psychic warfare only a very very tallented magician should attempt it. I know I'm not that tallented, yet..