What skills should Necromancers take when facing Orcs on a very large map?

I have a question about the battle between Necropolis and Stronghold, but regarding the creatures, not the city development. I couldn't find a more suitable topic, so if there's a better place to ask this, please let me know: Specifically: Cyclops, Free Cyclops, Blood-Eyed Cyclops. The full manual doesn't mention any restrictions on using the Mind Control spell on these creatures. However, while reading this thread, I came across comments stating that some modifications are indeed immune to it. Is this true? And if so, which modifications are immune, and which spells are ineffective?