Canon in my AU ends at the end of Season 3 (March 2013).
Elements of Harmony are still held by the Mane Six.
Changelings find a way to disable the Elements of Harmony.
War begins on the 8th of August, 2035.
War rages for 10 years, ending on the 3rd of January, 2045.
Main wargrounds are Canterlot, Ponyville and Cloudsdale.