A war is a good excuse for lots more combat, but doesn't shut out role playing opportunities if done right. There are after all endless amounts of political bickering and back stabbing going on with both sides, especially if allies are involved in the war. To add some more RPing you could perhaps throw in a subplot where there is some kind of resistance movement going on in the opposite side's camp. So then they have to figure out if it's for real as well as all the dangers of making contact, etc ... Not to mention that (contact) is RBDM in his own right.