Lastly, the great uncertainty of all data in War is a peculiar difficulty, because all action must, to a certain extent, be planned in a mere twilight, which in addition not unfrequently — like the effect of a fog or moonshine — gives to things exaggerated dimensions and an unnatural appearance.
Carl von ClausewitzModern wars are seldom fought without hatred between nations; this serves more or less as a substitute for hatred between individuals.
Carl von Clausewitz