Wilhelm Groener
During the First World War, Schiffer was an adviser to General Wilhelm Groener and was in charge of the law department at the War Ministry. In October 1917, he became "Unterstaatssekretär" (Undersecretary) at the "Reichsschatzamt" (Treasury). At the same time, Schiffer was a delegate to the lower chamber of the Prussian diet for the National Liberal Party (1903-1918) and a member of the Reichstag from 1912 to 1917. His oratory skills, support from big industry and his ambitious nature made him a well known deputy. He was in favor of strengthening the power of the parliament but as a monarchist opposed the revolution.