Originally Posted by thanius
what can we place on the wall troop? weapon? and how many?
Troops can go on the wall, though I "believe" it was changed to prevent mounted units. Depending on the wall, there are placements where you can build stuff like trebuchets, oil and stone tippers, as well as hordings to further protect archers on the wall. So, there are places where you can build weapons, but you cannot move weapons up onto a wall.