MADE IT TO POPULAR STORIES ON 10/22/16! MY FIRST EVER!
When the Caribou tribes united, no one thought much.
When the Caribou began conquering outlying territories, they got slightly nervous.
Now?
It's all out war as the Caribou declare Equestria fit for destruction. As the Equestrians hold out, the defense lines at the crucial Everfree choke-point are about to break after a particularly fierce assault. But, then, it begins to rain out at sea. And before the eyes of the Equestrians, a great fleet of ships enters the Ponyville Bay. Aboard is a race long thought to be myth. And they have come for one reason.
Liberation
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Earth, 1951
After the defeat of the Nazis and their Unendlich program, the United Nations and the Soviet Union enter an era of peace and rapid technological development. And the deployment of the Great Fleet, made up of sixty-five different warships, makes things better. Until the UN discovers a secret Unendlich lab deep under Merkers. The technology needed to enter alternate realities, the Nazi's last-ditch attempt to win the war. The United Nations develops the technology into a portal device. Then, through the device, they receive a message, pleading for help. Sending the Great Fleet through, the UN prepares for war.
The Face of War has changed. Watch out, Caribou.
Your days are numbered
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(Creator's notes) During the war, Unendlich was a German project designed to harness the universe's energy to win the second world war, sanctioned by Hitler himself. From direct laser weaponry, to robot soldiers, it was developed, but before any could be used, Germany surrendered. The UN took the technology and made it militarily available. The tech still has to be developed for civilian uses.
Other than that, historical details remain the same. Harry Truman is the president of the United States, Japan was still atomic bombed, and the like.
My take on Fall of Equestria. The humans in this universe have Wolfenstein-type technology, including single-unit exoskeletons, courtesy of Unendlich. For the guns, imagine World War II-era weapons, only modified as written. Caribou have been modified to make it teen-rated
(No sexual stuff, only aggression)
Teen for gore and language
Additional Character Tags-Cadance/Shining Armor, Changelings