"History is written by the victors, unless the victors can't write."

Not really. In my mind, they won the battle but lost the war.

It all depends on your point of view. If you look over the last millennia, the Huns didn't leave a lot of legacy beyond finishing off the corpse of Western Roman Empire, which wasn't really an empire then anyway. Their culture was absorbed and we only know of them because of that.

End of the day, they were ultimately just another band of warlords.

Yep. History is written by... the people that cared to write it down. And Romans wrote a lot.

That and the random chance of having your writings preserved through centuries.

Burning down the libraries in not something unheard of.

Burning wasn't necessary. Most texts that weren't copied continuously were simply lost. Our oldest sources for written Chinese are on dinosaur bones -- but the script already had characters that clearly show they also wrote with pen on bamboo slips, but we don't have any surviving examples of that until the Classical Chinese era.

They lost at the Battle of the Catalaunian Plains and were driven from Roman lands.

https://en.wikipedia.org/wiki/Battle_of_the_Catalaunian_Plai...