You police are some of the most BA guys on the planet. on survival I just let survival run once i grouped them together at a building and I came back 30 min later and they killed 3000 zombies of out of, what? 5000?
How is it a war if the tripod is pretty much invincible, destroys everything in it's path with a big laser, because to me thats gods way of saying screw you humans. i'm joking of course but still, think about it.