We have severely underestimated the Russians, the extent of the country and the treachery of the climate. This is the revenge of reality.
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Source, in full
Letter to his wife (9 November 1941) on the German failures in Operation Barbarossa and the battles of the Eastern Front, quoted in Images of Kursk : History's Greatest Tank Battle, July 1943 (2002) by Nikolas Cornish, p. 6; also in The Storm of War: A New History of the Second World War (2009) by Andrew Roberts, p. 409