![]() ![]() He took part in the initial stages of the Battle of France. When World War II began, Dannenberg, a member of the Nazi party since 1932, was drafted into the German Army in 1939, serving first with a horse-artillery unit acquired by the German Army in Czechoslovakia. Dannenberg studied mechanical engineering at the Technische Hochschule Hannover (current University of Hannover) with emphasis in diesel fuel injection, because he recognized that injectors would also be part of the process of moving propellants into a high-pressure rocket engine. ![]() He witnessed two tests with a rocket-driven railroad car in Burgwedel near Hannover and then joined Albert Püllenberg's group of amateur rocketeers. He became interested in space technology while attending a lecture by Max Valier, a German pioneer in that field. At the age of two, he and his family moved to Hannover, where he spent his youth. Dannenberg was born in Weißenfels, Province of Saxony (current Saxony-Anhalt).
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