As much as I love Wo der Mensch geht, folgt Krieg by BOBthieBomber (and wishing that he upload more to the story or have some else write it) I found another real-life history meets MLP fanfiction called The Man in Blue Uniform by newyorkx3 which takes place during the Civil War.

Even I am not into alternate ending history, I do enjoy how this fanfiction writers love to mix MLP with real history.

Anyone have any other history + pony fanfiction out there?