After a successful invasion, you and your ally are forced to find new land. The best you found had little farmland and not very many resources, but you took it anyway. Your ally built a large area with inns for travelers, and eventually built a small castle of his own. You both flourished, until your old enemy found you. They dealt massive damage, and you received much of your ally's troops, opening his castle. The enemy took that time to attack him, and was successful. You made it through this invasion, but just barely. It is rumored that they are still nearby, along with some witches. And obviously, that's pretty bad.
To win, you must:
Enclose the keep
Eliminate all enemy units
Get 5000 gold