That’s a bad phrase. History was written by those that could write at all! Most of ancient history is not documented as most peoples didn’t have a written sys

That’s a bad phrase. History was written by those that could write at all! Most of ancient history is not documented as most peoples didn’t have a written system at all. Also, for many other battles and events there are other parties (third parties) that wrote about them, but they were neither the losers nor the victors. Third parties has their own biases so that is often needed to take account into history. In the case of India, the bias might be into minimizing conflict and trying to minimize bad sides of previous figures. This happens in many other countries as well.