Nowhere to Run

You managed to run back one of the many threats, but I'm afraid it's not enough for us to hold this ground. The smarter of us are falling back to Unterbaum. I think I'm about to follow. Hopefully there we can route out the last of the accursed doctors and then fortify until the darkness passes. All that remains is for us to prepare the bridge for detonation. Any refugees in Volgenshore will have to make their way west to the Unterbaum bridge.

Go and get a barrel of explosive powder outside the tent, courtesy of the dwarfs. Take the barrel and place it with the other barrels at the center of the bridge. Return to Strom Von Heynau once you've done your part.