Born in 1909 into a family of a merchant in Hamburg, Kumm trained as a typesetter and worked at a newspaper. On 1 June 1934, Kumm joined the
SS-Verfügungstruppe (SS Dispositional Troops) and on 1 July received his first training with the SS-Standarte "Germania" in Hamburg. Kumm commanded the Der Führer Regiment of the
SS Division Das Reich from July 1941 to April 1943. This regiment was nearly destroyed in the Soviet offensive of January 1942, when it was reduced to 35 men out of the 2,000 that had started the campaign in June 1941. Kumm was a commander of the
SS Division Prinz Eugen from 30 January 1944 until 20 January 1945 and then was appointed the new division commander of the
SS Division Leibstandarte (LSSAH) as of 15 February 1945, after the division's commander
Wilhelm Mohnke was wounded. As the division commander, Kumm and the LSSAH took part in
Operation Spring Awakening (6 March 1945 – 16 March 1945), the last major German offensive launched during World War II. The Germans launched attacks in Hungary near the Lake Balaton area on the Eastern Front. Soviet intelligence identified large German tank formations in western Hungary and developed a successful counterattack strategy. After the failure of Operation Spring Awakening,
Sepp Dietrich's
6th SS Panzer Army and the LSSAH retreated to the
Vienna area. After Vienna fell to the Red Army in the
Vienna Offensive, the bulk of the LSSAH division surrendered to U.S. forces in the
Steyr area on 8 May 1945. Kumm was held at the
Dachau internment camp administered by the US Army. Kumm avoided extradition to Yugoslavia to stand trial for war crimes by fleeing over the wall of the camp. ==Activities within HIAG==