" It is a cliché, and a bad one, that generals try to “fight the last war” – that is, do what worked the last time out. That does not give them enough credit. Rather they tend to fight the war they would like to fight or the one they expected to fight. But neither of those responses is usually sufficient. The foremost task of a general is to understand the nature of the war he or she faces – which often turns out to be a third way, neither the one preferred nor the one expected. "

― Thomas E. Ricks , First Principles: What America's Founders Learned from the Greeks and Romans and How That Shaped Our Country