A young man with a love of military history and MLP:FIM finds himself dragged into Equestria as war threatens the pony nation.

I got the idea for this story from my Civil War book collection and Altoid's Blood and Guts and Ponies story, as it involves a human coming to Equestria to aid in its defense, partly by modernizing it's military and leading its forces on the battlefield.

Just a warning; the main character is Christian and pro-Union. Just to give people a heads up.

Long ago, the Seraphim granted power to the Doom Slayer that he might conquer the forces of Hell. The Doom Slayer has won, Hell lies defeated, and now he returns to the Seraphim's holy realm. His mission is not over though, he has promises to fulfill, rewards to collect, and as always, evil to defeat. Let those who would harm this sacred land tremble, for the Guardian of Equestria, has returned!

(This story now has two sequels: Legion and the novella Doom Slayer.)