You are the duke of a frontier area and during a long period of peace you earned fame and the confidence of the king, but the simple life as a duke will have an end now. Some soldiers on the scout reported that an unknown army straightway marches to your little empire. You send out some messengers, but no one returned.
The next morning, waiting for your last messenger, you get the information that your king has been murdered. It seems to be a conspiracy and the only thing you can do now is waiting and preparing the defense at your castle next to the town Wyre, which seems to be the aim of the unknown army.
In this map its important to wait as long as possible with the lightning of the bitumen to create a maximum of damage.
You can also try to attack the castle, but that wont fit with the story.