Go to the original sources? I refer you back to my statement about 4 different people giving 4 different and often contradictory stories. Sorry, but it is impossible when it comes to subjective matter. Let's take an event again. Let's say the recent shooting in Ferguson. The facts are that a black youth was shot by a white policeman. Why was he shot, who was to blame and was anyone else culpable are the questions that will be asked over and over again. The next fact is that the courts found in favaour of the police department. By why? Was it fair? The further you get from the event the more clouded the picture will become. How wars were fought is the same with added complications. Not all events are testable or objective. It is why history comes under humanities rather than pure science or art.