I thought I'd share an interesting paper that I got sent recently. It's only 17 pages but makes some good points.
Although it is not always evident in a lecture or a textbook, we can never be completely certain—and therefore in agreement—about what actually happened in history. Frederick and Napoleon knew this well. Skeptical both of the historian’s motives and of the reliability of his facts, they evinced a healthy skepticism about the ability of the human mind ever to recreate an event as it actually had happened. As soon as the historian begins to impose order on something as chaotic as a battle, he distorts. If his narrative is to mean anything at all to the reader he must simplify and organize the “disjointed mass of reports.” He must, for lack of space, omit incidents that did not contribute to the final result. He must resolve controversies, not merely report them, and he must recognize that not every general is candid, every report complete, every description accurate. Orders are not always executed; not every order is even relevant to the situation.