couldn't they figure out some way to kill walkers quietly from inside the wall? Like a knife on a long stick or a cement block tied to a rope?
Yeah, I was thinking of this myself about three episodes ago. They could easily fashion a spear long enough to poke some, if not most of them on alternating shifts, quiet enough to not alert the rest of the horde.
I did however see Talking Dead, and on the Inside the Dead segment, it was explained that storyline wise, the horde coming to the walls and the walls crumbling down happened in just one day. Then again, one day should be enough to thin the horde a bit by spearing some of them.
But yeah. Logic doesn't work in entertainment sometime, no?