S. L. A. Marshall was a combat historian during World War II. This essay is taken from his notes of the Normandy invasion:
Unlike what happens to other great battles, the passing of the years and the retelling of the story have softened the horror of Omaha Beach on D Day.
This fluke of history is doubly ironic since no other decisive battle has ever been so thoroughly reported for the official record. While the troops were still fighting in Normandy, what had happened to each unit in the landing had become known through the eyewitness testimony of all survivors. It was this research by the field historians which first determined where each company had hit the beach and by what route it had moved inland. Owing to the fact that every unit save one had been mislanded, it took this work to show the troops where they had fought.
How they fought and what they suffered were also determined in detail during the field research. As published today, the map data showing where the troops came ashore check exactly with the work done in the field; but the accompanying narrative describing their ordeal is a sanitized version of the original field notes.