(Left 4 Dead crossover) Francis, being the idiot that he is, messes around with a computer, and soon finds himself, Zoey, and Louis in a strange land full of ponies, while Fluttershy, Rainbow Dash, and Applejack get transported into the human world, to find Bill and a city full of zombies.

Guards. Police Officers. Watchmen. they are called a great many things and always stand resolute between the lives of innocents and the dark forces which seek to do them harm. They do not ask to be heroes, they do not seek out greatness but sometimes they have greatness thrust upon them. Follow the exploits of Sergeant Shrike and her squad of noble ponies as the waters of political intrigue swell up around them and they find themselves in way over their heads. Will they become the heroes that Equestria needs and more importantly, will they ever get some time off?

War comes to Equestria: with despair, with starvation, with suffering and with sacrifice. And the ponies must learn how to keep true to their values while surviving not just the rigors of battle, but the desolation of total war.