"Christian Karl August Ludwig von Massenbach (16 April 1758 – 21 November 1827), Prussian soldier, was born at Schmalkalden, and educated at Heilbronn and Stuttgart, devoting ...
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himself chiefly to mathematics.
He became an officer of the Württemberg army in 1778, and left this for the service of Frederick the Great in 1782. The pay of his rank was small, and his appointment on the quartermaster-general's staff made it necessary to keep two horses, so that he had to write mathematical school-books in his spare time to eke out his resources. He was far however from neglecting the science and art of war, for thus early he had begun to make his name as a theorist as well as a mathematician. After serving as instructor in mathematics to the young prince Louis, he took part with credit in the expedition into the Netherlands, and was given the order Pour le mérite." - (en.wikipedia.org 01.07.2021)
