AI in Might & Magic: Heroes VI

Just for fun, I completed the bridge mission on the hardest difficulty level with the most challenging AI settings. It took exactly two months. I played as Necropolis against Inferno. I didn't notice any particular difficulty in the AI's actions. My main combat units were vampires and ghosts. My hero was a mage, level 8. I took the following skills (in order): Education -> Drain Life -> Haste -> No Retreat! -> Tactics 1 -> Counter Strike 1 -> Defense -> Counter Strike 2.