The Great War is going smoothly. Vanhoover, Tall Tale, Applewood and finally the prize of Western Equestria, Las Pegasus has fallen. Army Group South has conquered it all. Western Equestria is now under Queen Chysalis' army.

Now their sights fall upon the Equestrian South. All lay before them is the flat desert terrain. Perfect for their doctrine of mobile warfare. No more of those urban combat, hill fighting, forest battles and river crossings. It should be easy. At least that's what they thought.

They were wrong.

Set in Equestria at War