I finished this mission on the sixth day of the second week (I'm a little sad it was so quick). Maybe someone will find it interesting, especially those who want to complete it faster. The thing is, I didn't capture any mines or forts from the red player. After freeing Duncan, I moved all the humans to Frieda and, together with Wolfenstein, rushed towards the dwarven castle. Wolfenstein had enough strength to break through both garrisons (even resurrection wasn't really needed), and Frieda attacked the castle. As a result, she killed the dwarven king, and the mission was completed. Of course, I had to resurrect the crossbowmen and paladins a few times. I don't know, maybe I'll replay it later, because it wasn't very interesting when not a single monster even had a chance to attack.