Awakening of Evil

I recently downloaded a campaign. In the first mission, where you get the Cloak of Deadly Shadows, and in one of the areas where undead creatures appear among the neutral units, there are creatures that look like Cave Lords, but there are 7 of them, each with 10,000 health, and darkness doesn't affect them. How do I fight them? Also, instead of wolves appearing when exiting the dungeon, there are dark, stout men who attack from a distance through the ground. They also appear in other places. What's the best tactic against them?