Before I launch into my opinions, allow me to congratulate you on posting your first short story. It takes a bit of bravery to let other people look at such a personal thing as your writing, even in anonymity of the internet.
Preliminary praise aside, my first reaction to your story is this: Needs better structure.
If you'll look at the first paragraph, you'll find that two basic sentence structures are used:
QUOTE
A crowd of citizens watched the blazing house light up the night, unsure of what to do. They stood dumbfounded, as if they hadn't ever seen a bonfire before. The Breton smirked, thinking they were struck with awe. The sound of hooves filled the air next to the popping flames. Two legionnaires on horseback entered the scene. They stared for a moment at the flames reaching for the sky absentmindedly. They seemed to snap back to reality as they dismounted.
This is, for the most part, a negative, although I omit mentioning the first four sentences of your story since they seem to be purposefully short and clipped, for effect. But this pattern holds for the most part throughout your story. Remember, variation in sentence structure makes your story less of a drone to read through by holding people's attention, and you will find that many of the niceties of writing are only achievable with a wide mix.
Also, at many points you misuse words, put them in wrong or awkward order, tended to repeat certain ones, or punctuate incorrectly. You should read over your story a few more times to make sure these instances are minimized, and maybe get a proof-reader to check it over doubly. (And if you would like me to show you where I found errors, please ask and I'll PM you.)
The final problem that I perceived was a proclivity to hold the reader's hand and simply recount the action; the story almost read like a school report. There was not enough exploration of your character's thoughts to give us a sense of him. Your use of description when it came to the burning Imperial was pretty good, but overall there was no real sense of place or immediacy; everything felt cloudy and vague because you never filled in the details.
Those are my thoughts. There are a lot of negatives there, but know that I'm trying to be as honest as possible and direct you toward areas which, when improved, will improve
you as a writer. I hope that you take some of these suggestions and run with them, and keep on posting stories so I can see how you develop. Trust me, you show potential in this story, and with more experience you could easily craft some very engaging narratives. So, please, keep it up!