This story is a sequel to The Shogun Six
Equestria appeared on Earth and many had no idea what to expect. Then the Conversion Bureaus opened and the racism of the majority of the pony race was exposed. Then came the PER and forced conversion, which Celestia turned a blind eye to, and in doing so gave non-verbal tacit approval to. The Solar Tyrant believed that Earth would soon be hers, and many on Earth believed their defeat was inevitable.
The arrival of a SECOND Equestria threw expectations out the window.
Now Earth has new, powerful allies willing to take up arms. Earth calls for aid....
And The Shogun Six will answer.
A non-canon fic set outside the Shogun Six saga, this fic nevertheless has some spoilers for that saga. Now officially part of the canon to the series! Do not read if you don't want spoilers to The Shogun Six. Rated teen for language and possible gore for the time being. Rating may change to mature as need demands. Current tags may change as the story progresses if I feel some don't fit as well as they might otherwise.
Oddly, this fic has been mentioned on TVTropes.org, but has no page of it's own. Ah well. One can only hope.