Col. John Boyd's famous theory of the OODA Loop did much to explain the psychology of why armies win or lose battles. And "Flashpoint Campaigns: Cold War" is the best simulation I've seen of OODA in action. My look at this game for Military Times.
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Flashpoint Campaigns is an OODA Loop-anchored computer wargame that depicts a hypothetical Warsaw Pact invasion of West Germany in 1989.