from Wikipedia
Kurt Gebhard Adolf Philipp Freiherr[1] von Hammerstein-Equord (September 26, 1878 - April 25, 1943) was a German general who served for a period as Commander-in-Chief of the Reichswehr. He is famous for being an ardent opponent of Hitler and the Nazi regime.
According to the reminiscences of his son Kunrat von Hammerstein, Hammerstein-Equord resigned from the Club of Nobility when they threw out their non-Aryan members in 1934 or 1935, and spoke of "organized mass murder" of the Jews before the summer of 1942. He supplied his daughter Maria-Therese von Hammerstein-Paasche with the names of Jews who were scheduled for deportation or arrest, enabling her to warn or hide them. Two of his sons, Ludwig and Kunrat, took part in a failed plot to kill Hitler and replace the Nazi regime with a new government on 20 July 1944, fleeing Germany in its aftermath. His widow and two younger children were then deported to a concentration camp, and freed when the Allied Forces liberated the camps in 1945.
As Chief of the Army High Command, Hammerstein-Equord oversaw the composition of the German manual on military unit command (Truppenführung), dated 17 October 1933. He originated a special classification scheme for his men:
I divide my officers into four classes; the clever, the lazy, the industrious, and the stupid. Most often two of these qualities come together. The officers who are clever and industrious are fitted for the highest staff appointments. Those who are stupid and lazy make up around 90% of every army in the world, and they can be used for routine work. The man who is clever and lazy however is for the very highest command; he has the temperament and nerves to deal with all situations. But whoever is stupid and industrious is a menace and must be removed immediately![4]