When you think you're naturally superior to your opponent, you're inevitably going to underestimate their capabilities. A good illustration is the 1941 German invasion of the Soviet Union. The failure of the German high command to provide their soldiers with winter uniforms is widely regarded as
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an inexplicable blunder; but the reason is simple: Nobody in the German high command thought there was any possibility of the war lasting until the winter. The plan was to inflict massive casualties near the border, causing the collapse of the Soviet government.