Fair warnings had been given not to try Luna�s patience. But after Celestia and her army had trespassed on her land, laid waste to her outer villages and threatened forceful take-over should she not comply, Luna and her people could no longer look the other way. She needed to defend her people from the tyranny that came with Celestia�s reign. She needed to remind her that the world was not hers for the taking, and that her people would not bow to one that they themselves have sworn no allegiance to of their own free will.

(Gore rating just in case) Also... before you 'dislike' the story because it's human form, wait until the end when it's explained...