The fog of war is an ever-present reality, defined by factual uncertainty brought on by the imperfect recollections of people subjected to stresses that are unthinkable in everyday life.
It is not uncommon for opposing parties to a conflict to put forward competing narratives about a given event, with each side believing itself to be accurate, yet their respective facts and the conclusions derived therefrom failing to align. However, sometimes one or both parties have something that they want hidden, an uncomfortable reality that should, from their perspective, never see the light of day. In that case, the fog of war becomes a deliberate smokescreen designed to mislead and misdirect an audience so that the truth is never found out. If only one party is participating in such a deception, the fact will generally find a way to reveal itself. But if both parties are engaged in deliberate obfuscation, it becomes virtually impossible to find the truth.