After Celestia sent Nightmare Moon into her 1000-year exile, Nightmare Moon's most fanatic followers rose up and began a march on Canterlot to overthrow Celestia. The only thing between them and the Princess were the 189 Royal Guardsponies.
Just another small-time, average fanfiction writer. Not as much a brony as I used to be, but I write because you can do almost anything with Equestria.