Treuenfeld continued to hold the position of SS and Police Leader of Waffen-SS North East between April 1941 to December 1941.

From December 1941 to September 1942 he held the same position for Bohemia and Moravia, and served the deputy of Reinhard Heydrich.

After the assassination of Heydrich in Operation Anthropoid on 27 May 1942, the men responsible, Jan Kubiš, Jozef Gabčík and others, were betrayed and trapped in the crypt of Ss.

Treuenfeld was in command of the troops that stormed the church on 18 June 1942, only to find that after holding out for hours they had committed suicide.

[2] Treuenfeld committed suicide on 7 June 1946 whilst a prisoner of the American Army at Steinlager Allendorf prisoner-of-war camp.