The Second world war was actually the third. So what was the first then?
1001, darkness and dustiness covers the earth. One side is at battle with the other. Ponies vs Humans, and as the ponies friendly way is resorted to fight for the survival, how will this turn out? And now, a time traveler has come to the year and gotten captured. Can he make the humans win? Or will the ponies reside? Or will they come to a treaty? It's up to him to make sure that history is correct so he can return to a regular land with regular ponies.