Wulfsten's Challenge - "Laslo" [Campaign 2, Mission 5]

Marika: Slowly build up your army. Determine when the danger level for Laslo is medium, or when you think the army is sufficient. Then, go to the Seraphim, or as they are called there, the Fallen Angels. They are located at the top left. They will want to join your army – agree. If they attack, build up your army and attack them. Once they agree, go to the city at the bottom right. Laslo should cautiously leave the castle on the left (his own) each week and transport the troops of the Wolfsden faction to the castle he captured. Keep an eye on the danger level. When the danger is low, attack!

Added 4 minutes later
And yes, don't send Duncan anywhere; let him stay in the Wolfsden castle. But make sure he has some kind of army.