Inspired by Superdale33's Lost and Fallen.

William Kaine, a late 21'st century Heavily Armored Trooper, has seen cruelty. From wars to slave trade, and everything in between. Always, he was there to intervene. But what can he do when his only option is to turn against his species as a whole, in a world where sentient ponies are enslaved and ruthlessly killed, should they try to resist? It would seem the choice was made for him.

Till Death Do We Fight, So That Others May Be Free.
Never has it meant more.