Gunnar has reported that there are some large boulders between the fortress and us. Those boulders should give us quite the advantage since it blocks line-of-sight for many of the enemies. We should be able to approach with caution and pick off a few more of the small ones before the others even know we are here. We may need to taunt another ogre or 2 as well and back off, letting them come after us. After that, we can focus on the archers behind the wall.