A mining village has rebelled due to a sudden tax hike. The lord has escaped into his mountain hideout and deployed his bodyguards to block the approach.
You must find a way to dispatch your oppressor before his army arrives to the rescue, and the only weapons you have are your mining picks.
The map definitely can be beaten, but you'll have to use both tunnelers and their tunnels in an unorthodox way. If there is need for explanation, I might write an article someday.