Me and my friends got into an argument about this. Let's say you are defeated in battle and retreat into an empty area that has a castle or stronghold in it. Do I know control that area since I have units in there? And, if so, does that mean that my Victory Points go up?
Some were arguing that you can only control an area by marching into it. If you have units on an area that were routed into that area you don't control it unless you march. That would mean I have to leave the area then come back to it which sounds silly to me.
Personally I think you should be able to control it. You retreated from battle into an empty castle and now it's yours.
What do you think?