Those city walls and gates have flags that are built into the 3d battlemap building. They are quite difficult or not possible to change from what I've been told (they certainly don't use the regular flags or banners) - I guess we could have someone do it if we had someone at all who would work on our battlemap buildings - but we don't have a single person who will touch it. So those will just have to remain for the forseeable future. Sorry LE.