As they seek to fight with you, I think you should take up their challenge. Go and hunt down those mountain tribes! Maybe you can take someone alive - he might provide useful information!
- Acquire 4 sectors of Galgenschlucht
- Plunder 2 buildings or research a technology
You did it - partially. You defeated those barbarians, but you were not able to take any alive. As crazy as it sounds - they were fighting until the death!
Early Middle Ages Bonus Quest Line
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Next Quest: Barbarian Expertise