Here my strategy:
let the survivors deal with the slow walking zombies while you stay back waiting for the zombies that run to come: preventing the zombies with weapons from killing your survivors while you are reloading and preventing a lot of damage from happening to your barricade
 "Deadly Neighbors 2"){kind=icon}
 "Ragdoll Avalanche 2"){kind=icon}
 "The Last Stand 2"){kind=icon}