I've been thinking (while I'm supposed to be studying), and I came up with this idea.
Namely, that we should submit any losses we have in battle at the city we don't mind loosing, ie. Brustenbruck, then register our wins at a city like Rhya's Sisters. Yeah, and registering heaps of attacks all at once on a single city that we want to attack is a good idea, but we should try early when we have spare battles.
As for Risk, we may have it here but I've never seen it.