With proper placement and movement shenanigans, battering rams can attack objects beyond walls.
It's not really I big deal, I guess, since if you manage to dry a ram near someone you can simply take down their walls... but it could be used for some sort of griefing too, like... instead of facing the enemy by taking down a wall, one could start taking down structures and buildings (which people usually build near walls) to force the defenders out or something. I don't think it is intended, walls are supposed to be taken down before any damage can be done to a base, right?
Anyway, if it is indeed a bug... can I plz haz beard?
(or cape or something 
)
