Emily Litella lives

Ok I’m a bit confused here. Why would you need to put shutters on a wall? I mean what need would they serve? It’s not like you have to keep the rain and bright sun from falling against stone brink or concrete. Further how many would you need? Would you have a mess of small ones or one gigantic iron grate suspended by iron hinges pull open by an army of enslaved orcs.
“pswsha miswsha”
“What do mean I got it wrong”?
“pswsha miswsha”
“The walls shuddered in his advance.”
“My bad”
“”pswsha miswsha”
“Just build a bonfire in back”