Listen carefully. My lord does not trust the clan currently in possession of this fortress. You can see the effort and expense he has gone to to assemble this mercenary force as a counterweight. Were you to expel the current owners and capture the fortress, I am sure he would be most grateful. (Of course, that probably won't last long -- it's not called a "3-day reign" for nothing...)

Oh, forgive my muttering -- just talking to myself, you know. In any event, let me explain a little about the two types of fortresses.

Territorial fortresses are built within a territory to defend against monster attacks, while border fortresses are established along the boundary between two territories. If you have a map, take a look for yourself and you'll see what I mean. Blue flags indicate territorial fortresses, whereas red flags indicate border fortresses.

Ask him how to conquer a fortress.