DescentIntoDarkness
Saving Halal
Try to take advantage of terrain and daytime. I stayed away from the water hexes directly close to the other shore since the defenders have a bonus if they attack water standing units when still standing on land. Block the ford. Then rush for the northern shore if you can reach land. Capture villages and let your human allies do the hard work.
A peaceful valley
Do not try to solve this level without entering the Swamp. Once you enter the Swamp with either Malin Keshar or Darken Volk you will get Ghouls which make the difference between impossible and reasonable to win this level. Bats are useful to capture villages but have little chance against the guards, unless you move two or three of them together.
A Haunting in Winter
Do not move non-flying units onto the ice next to the bridge which separates you from the Orcs valley, it does not carry much weight. Ghosts and Corpses can cross the mountains left of your starting fortress. Unfortunately the fire arrows are quite effective against ghosts. I finished the south Orc first and had an easy time to defeat the north Orc. Ghosts and Bats can capture difficult to reach villages and move on, thus weakening your foes.
to be continued.