Neighbours in Heroes 5

Yesterday, they didn't even know the others existed. Yesterday, the four small peoples divided by impassable mountains lived their own lives, not a thought of conquest in their heads. But everything changed when an over-friendly Wizard, wishing to do them a favour, installed teleports in the valleys so the neighbours would finally be able to meet each other. Sadly, the contact didn't go too well, the neighbours were so different that each saw the others only as enemies. The formerly peaceful valley was soon flooded with rivers of blood...