In the great action game The Last Stand, you have to fight off hordes of zombies from your barrier to stay alive through the night.
Protect the barricade at night, and then send out search groups during the day to find more weapons and survivors. They must also fix any damage that may have been done to the barricade overnight.
Aim for the zombies' heads when you shoot them to kill them before they get to your barrier. Once they began to damage your wall, you had better kill them quickly before they broke through it and added you to their group.
Have fun and good luck!