The batponies were a proud race of ponies. There colonies thrived, until they they were found by the ever expanding Equestrians. Royal Guard Sergeant Swift Night tells her daughter how four batpony colts traveled from their ruined village and how they became the first Lunar Guards and the batponies were saved.
A little sparse and bare with the prose, if you ask me. You have a solid concept, but could use more development.
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That's because I accidently posted the unedited version.... and deleted the finished one. I will unpublish and re-edit the story.