Career
Coming from a military family Hausen entered the Saxon army as a cadet in the royal Saxon school of cadets. Being promoted to Seconde-Lieutenant in 1864 he joined the 3rd Jäger Battalion and served against Prussia in the Austro-Prussian War of 1866. Where he saw action at the Battle of Königgrätz.
After that war, Saxony allied with Prussia and became a part of the German Empire when it was created in 1871.
From 1871 to 1874 Hausen taught at the Prussian military academy in Berlin and from 1875 until 1887 he served on the Imperial German General Staff. Being the chief of staff of the Saxon army from 1892 to 1895 he commanded the 32nd (3rd Royal Saxon) Division from 1897 to 1900 and the XII (1st Royal Saxon) Corps from 1900 to 1902.
He served as Minister of War of the Kingdom of Saxony from 1902 to 1914, being promoted to Generaloberst in 1910. Upon mobilization in August 1914, the Royal Saxon Army became the German Third Army and Hausen was given command.
When asked about how such deeds will eventually be known into history, he replied: "We should write history ourselves" After the Second Army"s retreat after the First Battle of the Marne, Hausen saw his own flank exposed and ordered a retreat.
After the stabilization of the front on the Aisne River, on September 9, 1914, Hausen was relieved of his command due to illness and replaced by General Karl von Einem. Hausen held no further field commands during the war, and died shortly after the war ended. July 31, 1864: Sekonde-Lieutenant (2Lt) July 31, 1866: Premier-Lieutenant (1Lt) January 2, 1872: Hauptmann (Cpt) April 1, 1881: Major (Major) April 1, 1887: Oberstleutnant (Ltc) March 20, 1890: Oberst (Colonel) March 25, 1893: Generalmajor (MGen) December 17, 1896: Generalleutnant (LGen) May 12, 1901: General der Infanterie (General) December 17, 1910: Generaloberst (ColGen).