it's a known fact that "history is written by the victors"

Not at all. I'm Filipino. We lost our war of independence after the United States bought us from Spain, and yet there is still a Filipino point of view to those events. The US has its own version of that in the Lost Cause. The vast majority of English-language treatments of the Vietnam War are from, you guessed it, a US point of view. English scholarship on the Battle of Midway relied on the testimony of Fuchida Mitsuo for near on fifty years until later research proved that "Fuchida's book contains transparent lies" - and a considerable part of proving him wrong was access to Japanese sources.

History is written, period. u/Tiako continues this line of thought here.

As for bias? Here's a secret: It's all biased. All of it. But that is not a bad thing. u/mikedash examines the matter of bias here, and u/Georgy_K_Zhukov does the same here.