Rauch graduated from the University of Tartu with a degree in history in 1927, leaving for Germany in 1939.
He joined the staff of the University of Marburg, where he taught Russian history, in 1946, becoming a professor in 1953.
In 1958 he accepted an offer from the University of Kiel, where he became head of the Institute on East European History.
His pioneering history of the Soviet Union was translated into other languages and became a standard textbook.
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