Does anyone remember how a long time ago - I can't even remember if it was a Native problem or a crpg problem - on plains maps horses would just suddenly stop and rear up, despite there being apparently nothing in the way to stop them? Well, I'm afraid I have to report that this bug is back: it happened to me twice on the Field Battle map, riding through open ground and the second time it also affected an enemy rider who was alongside me. Both our horses struck an "invisible wall" in the middle of the map and reared up.