Walther Heinrich Alfred Hermann von Brauchitsch and General Ludwig Stummel, photographed by Heinrich Hoffmann. Walther Heinrich Alfred Hermann von Brauchitsch (4 October 1881 - 18 October 1948) was a German field marshal and the Commander-in-Chief (Oberbefehlshaber) of the German Army during World War II. After the 1933 Nazi seizure of power, Brauchitsch was put in charge of the East Prussian Military District. He served as Commander-in-Chief of the German Army from February 1938 to December 1941. He played a key role in the Battle of France and oversaw the German invasions of Yugoslavia and Greece. After the war, Brauchitsch was arrested on charges of war crimes, but he died of pneumonia in 1948 before he could be prosecuted. Ludwig Stummel (5 August 1898 in Kevelaer - 30 November 1983 in Kronberg im Taunus) was a German career signals officer with the rank of Konteradmiral, the Chief of Staff of the Naval Warfare department, Naval Communications (4/SKL) of the Kriegsmarine. Stummel was most notable for being the person responsible for the cryptographical security of the Enigma cipher machine and Key M infrastructure security, during World War II.