Zombies: Line of defense. War of zombies

The zombies had a line of defense. The world will be saved from destruction by hordes of zombies. You should place towers and train your soldiers. The civilians can be saved from the walking dead in this game. You should surround your base with defense towers. "Stop monsters with fire from your guns." Hire new soldiers and train them. Get more powerful weapons and mount them to all the towers. Each weapon has weaknesses and strengths.