Battle of Valmy
On returning to Prussia Massenbach became mathematical instructor at the school of military engineering, leaving this post in 1792 to take part as a general staff officer in the war against France. He was awarded a prebend (sic) at Minden for his services as a topographical engineer at the Battle of Valmy, and after serving through the campaigns of 1793 and 1794 he published a number of memoirs on the military history of these years.