Quote Originally Posted by Ironside
Destroying all the wall segments together with all the towers also prevents arrow fire too.
How those wall segements attack is another issue though
Using arrow slits and battlements - that's what they're for!!

Remember the "castle defenders" who shoot arrows (and artillery from towers) are not your garrisoned troops - they're extra and come with (and hide in) the fortification structure. You doin't see them. You can have a garrison of only one man, and still all the towers and walls and gates shoot arrows/rocks/pour boiling oil :)