Okay?

Humanity has conducted so many wars in so many different ways that any coincidences are pretty much expected to be present in a fictional war story.

The high-elves took over the wood-elves home. Forced them to join.

Most or all fiction in based is some reality. It gives it validity. As the saying goes, "Truth is stranger than fiction." I wrote a short fantasy fiction story and made reference to a location, explaining that the location was "at the equatorial line of said planet," and was heavily chastised for it. Claiming that it was based upon science and reality an therefore not based in fantasy.

The Holy Roman Empire was netther Holy, Roman or an Empire.