Leaving the military, he was employed in various fields, including agriculture, banking, the glass industry and the textile trade.

[1] Attaining the rank of SA-Gruppenführer in 1932, Kasche headed the SA-Gruppe Pommern and later advanced to the leadership of SA-Obergruppe II with headquarters in Stettin (today, Szczecin).

At the end of June 1934, Kasche was one of the SA senior general officers to survive the Night of the Long Knives, when SA-Stabschef Ernst Röhm and many of his close associates were murdered.

[7] In September 1938, SA-Stabschef Viktor Lutze appointed Kasche as the SA Representative for New Farming Settlements and Ethnicity Issues.

The outbreak of the Second World War and the quest for Lebensraum provided an opportunity to expand the program into territory conquered from Poland.

Combined with a lack of interested SA recruits (only 2,150 volunteers by April 1941 as opposed to the estimated 45,000 needed), this spelled failure for Kasche's program.

At the time he left the post for his next assignment, no successor was immediately appointed and the SA eventually gave up on any direct role in the settlement project.

[9] On the outbreak of the war in September 1939, Kasche entered the Wehrmacht as an officer and participated in the Polish and French campaigns.

He was one of a handful of SA officers appointed to diplomatic posts in central and southeastern Europe by Foreign Minister Joachim von Ribbentrop in an effort to limit Himmler's influence in the area.

[13] German military reversals on the eastern front during the 1941–42 winter that culminated in the failure to take Moscow prevented its establishment, leaving the project in the planning stages.

On 4 June 1941, Kasche led a meeting of German and Croatian officials who agreed on a resettlement scheme that would ultimately affect half a million persons in four countries.

He was tried by the Supreme Court of the People's Republic of Croatia in May 1947, convicted of war crimes and executed by hanging on 7 June 1947.