Idea becomes Four-Parter

The idea for the MLP/Red Dawn crossover has mutated into an idea for a four-part series at which Lunar Dawn (the original concept) will be a part of.
The series will all surround an alternate history Equestria at which Nightmare Moon, who spent the thousand years seething and growing in power, is able to resist the Elements of Harmony back in the beginning of SE1, and Celestia intervenes. Though Nightmare Moon is reverted, the Elements are practically destroyed as a result and Luna is not offered at first (nor accepts later) Celestia's offer to rule with here. Later, Equestria divides itself into two kingdoms: A Solar Empire, Ruled by Celestia, and a Lunar Empire, ruled by Luna. However, in the five-year gap between the setting of most stories, both sides start stockpiling new weapons in case one decides to attack the other, and eventually, Luna makes the first move. The stage is set for conflict.
All four fics are currently in development

The Fics in order of release are:
Warning: Potential Spoilers ahead!

Sunset- composed in two parts (though released as one), Sunset is the story immediately before the events of Lunar Dawn. It stars Celestia as (in the first part), she remembers her moment of defeat and shame five years ago at the hands of her own people and Luna, and the origins of both the Solar and Lunar Empires. The second part is in the present time of the story, and deals with some unexpected news...

Lunar Dawn- The Mane 6 and the CMC (a bit older, but not much), team up in a Red Dawn style to combat the invaders of their land, and learn that their friendship is now not just magic: its necessary for survival.

Wings over Equestria- Soarin' oriented fic that deals with the events during the five-year gap and also, the dawn of the invasion. The fic also goes into detail on the development of most of the advanced technology seen in Lunar Dawn (gotta explain how they go from swords to guns in five years). Expect some Spitfire too...

Revenge-
BIGGER SPOILERS AHEAD
This fic deals with Shining Armor, and his background as a result of this whole situation is discussed in the beginning.
In this universe, he does marry Cadance, but a year or so after the marriage (two to one years before the invasion), Cadance is killed tragically in an insurrection of pro-Lunar fanatics in the Solar Empire.This breeds a hate for all Lunars in Shining Armor, and after news is brought about his sister, he goes rogue in a personal war against Luna. At the same time, the war's been dragging for months, so Luna and Celestia are considering a peace treaty at a summit in Canterlot. However, Shining Armor's war will not end so easily...