In addition to my suggestions regarding battles, it could be even an possible happening that your or the enemy units could make prisoners of units from the other side. And the battles could vary in size, from little encounters and fights wich are short, to middle size ones and even realy epic battles with lots of action going on wich last long. In short and little ones, stealth and shadowy attacks could be cool, while in realy epic and big battles that makes not so much sense, since there is so much noise and destruction around you. some of these elements could be even good in quests or in expeditions if they come in.