Arelith

Why they can't build some kind of fortification? I saw some models at battlefield near knight's tent. At this point blacksmith can do only improvising fortification just like wall of anvils.

We do not like players making fortifications out of fixtures. There is one fixture (Chevex du Frix - who's spelling I have thoughly murdered here-) in carpentry, but even this we ask players to use with care and thoughtfulness.
If you see players making massive fixture walls, out of anything, let us know so that they can be removed.