In this mission, you´ll be confronted with harder and harder invasions, the latest ones really strong. Make good use of the rich resources in your suroundings, or you will not make it. You´ll need a lot of oil smelters and multiple walls, for some of the attacks are to massive to kill of with crossbowmen
A mission which demands good economical skills, but also both attack and defensive training.
On hard: a tough challange for experienced players.
On very hard: i just wanna say good luck.