Erich Dethleffsen (2 August 1904 – 4 July 1980) was a German general from Kiel. He was married to a daughter of Nikolaus von Falkenhorst, who planned the German invasion of Norway and Denmark during World War II. 1904 Aug 2: born in Kiel. 1923 Nov 1: entered army. 1925 Nov 1: als Freiwilliger in das Infanterie-Regt 8 1927 Dec 1: Leutnant (2nd Lt.), Infantry-Regt 1 1931 Jan 1: Oberleutnant (1st Lt.) 1931 Oct 1: Adjutant, des I. Bataillons, Inf-Regt 1 1934 Oct 1: Adjutant, II Bataillons, Inf-Regt Konigsberg 1935 May 1: Hauptmann (Captain). 1935 Oct 1: kommandiert zur Kriegsakademie. 1940 Oct 1: Major