Blood trails. Both bodies were dragged to the burn site. Obviously, they might have died and then been dragged out and burned. But the midnight feeding of the rats at the fence has the hair on the back of my neck saying "But wait, there's more!"[/i]
One of the reasons I keep watching. The staff on this show loves hairy twists & turns - and so do I!
I like the idea of a solid wall, but not as the first barrier. Leave the chain link fence up and setup watches on top of the solid barrier.
I was going to suggest the watches be armed with something low-tech & reusable, i.e. spears, bows etc. But they're either not long range enough or not accurate enough for consistent head shots on moving targets. Fire's not a good option. A moat - not so good either. Spikes/stakes - need to be cleaned off, meaning
someone has to go outside the perimeter. Explosives? Makes little pieces that will still be trying to kill someone. Maybe bring back roll-your-own black powder and adapting/manufacturing something to use it - long gun, cannon, etc.
Perimeter defense against an army that can only be killed one way is a bitch.