Hahn was promoted to the rank of SS-Standartenfuher (colonel) and reassigned to the Western Front In December, 1944 he was stationed in the Rhenish town of Cochem and served as commander of "Einsatzgruppe L" during the Battle of the Bulge.
Hahn was promoted to the rank of SS-Standartenfuher (colonel). Hahn was reassigned to the Western Front. He was stationed in the Rhenish town of Cochem the Western Front. This was in December. He was served as commander of "Einsatzgruppe L" during the Battle of the Bulge the Western Front. This was in December. December was 1944.