The Ulm subcamp was established in the Oberer Kuhberg fortress, located on the Kuhberg hill. The camp was only in existence for two years, between November 1933 and July 1935. The camp contained around 600 political prisoners, one of whom was Kurt Schumacher, who later served as the leader of the Social Democratic Party from May 1946 to August 1952.

 

There is now a museum on the site, the website of which can be viewed here. According to the website, the 600 prisoners, aged between 17 and 71, were accommodated in the underground walkways in the casemates of the fort. These areas hadn't been used for any such purpose during the fort's history. 

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From November 1933 and July 1935 about 600 men between the ages of 17 and 71 were housed in the fort; and not in the central reduit building reserved for the concentration camp administration, but in the underground casemate walkways for guards. These had not previously been used to accommodate people - even when used as a prisoner of war camp. In 1934, a number of prisoners not aligned to any particular party but still active politically against the Nazis (who were termed 'anti-socials') arrived at the camp, including three Catholic priests and a member of another evangelical church, and also Kurt Schumacher of the SPD and Alfred Haag of the KPD. The new prisoners were subjected to considerable harassment by the guards and were kept in solitary confinement.