Fallout Equestria: Clearer Skies
Two pegasi from Stable 199 are forced to flee when a group of Steel Rangers invades the Stable. They find themselves in the relatively forgotten city of Seaddle, a city built by Luna at the beginning of the Great War. Together they stumble upon the greatest kept secret of the war, the most unlikely surprise ever, and the ultimate weapon. In a tale filled with twists, turns, and action at every corner, there is only one outcome, clearer skies.
Fallout Equestria: Clearer Skies. ---- If you haven't read Fallout: Equestria, I suggest that you do, it is, in fact, what this story is a fan fic of.
Fo:E is by Kkat and can be found here: http://www.equestriadaily.com/2011/04/story-fallout-equestria.html