The first battle for Harrack Unath was not going well for its tiefling defenders. Waves upon waves of dragonborn warriors assaulted its battlements, and all seemed lost. The first sign that the tide of battle was changing, according to surviving veterans, was a dim glow in the east. Over the ridge came five companies of tiefling cavalry, all mounted upon steeds of living flame. The dragonborn ranks broke, and the city was saved.
That’s from my Elemental Steeds entry for the latest Expert DM Competition, which runs over on the official WotC message boards. Lots of other good entries too, and earlier competitions have lots of good material. You can also check out my designer’s notes for Elemental Steeds.
All in all, worth checking out!