When the Griffin kingdom north of Equestia is suddenly conquered by an army of ancient half dragons, in a single night.
Twilight Sparkle joins the newly founded Equestrian army, via request of her mentor, to become a vice commander stationed in Ponyville, under the rather mysterious Commander Lucas Blackmane whose past is clouded by sinister rumors.

Follow Twilight, Lucas Blackmane, a newly returned Spike, who has been gone for three years, and occasionally the rest of the mane six, as the battle rages not too far from Ponyville

thanks to my friend Kartaal for being my pre-reader and editor.
Also note that I started writing this before season 3 started, so please disregard season 3 and season 3+.