Westhoven served in the Army personnel office at the start of World War II, where he had been from 1934 to 1940, and then took command of the 1st Rifle Regiment in October 1941 as an oberst (colonel) (promoted on 1 November 1939), and led this unit into Operation Barbarossa as part of 1st Panzer Division in Army Group North. In February 1942, he took command of the 3rd Rifle Brigade, which later became the 3rd Panzergrendier Brigade.[1] He was given command of the 3rd Panzer Division on 1 October 1942,[2] and was promoted to generalleutnant on 1 May 1943, but was wounded in action on 20 October 1943.[3]
Returning to active service on 1 February 1944, he served as an advisor under his mentor Leo Geyr von Schweppenburg in Panzer Group West, had two brief deputy commands in France (21st Panzer Division from 8 March to 8 May 1944, and 2nd Panzer Division from 5 May until 26 May 1944), and ended the war in the roles of deputy inspector general of panzer troops (August 1944 – 1945) and commander of tank schools (1945).[3]
^ abMitcham, Samuel W. (2006). The Panzer Legions: A Guide to the German Army Tank Divisions of World War II and Their Commanders. Stackpole Books. p. 57. ISBN9780811733533.
Fellgiebel, Walther-Peer (2000) [1986]. Die Träger des Ritterkreuzes des Eisernen Kreuzes 1939–1945 — Die Inhaber der höchsten Auszeichnung des Zweiten Weltkrieges aller Wehrmachtteile [The Bearers of the Knight's Cross of the Iron Cross 1939–1945 — The Owners of the Highest Award of the Second World War of all Wehrmacht Branches] (in German). Friedberg, Germany: Podzun-Pallas. ISBN978-3-7909-0284-6.
Glantz, David M.; House, Jonathan (2009). To the Gates of Stalingrad: Soviet-German Combat Operations, April-August 1942. Lawrence, Kansas: University Press of Kansas. ISBN978-0-7006-1630-5.
Patzwall, Klaus D.; Scherzer, Veit (2001). Das Deutsche Kreuz 1941 – 1945 Geschichte und Inhaber Band II [The German Cross 1941 – 1945 History and Recipients Volume 2] (in German). Norderstedt, Germany: Verlag Klaus D. Patzwall. ISBN978-3-931533-45-8.
Scherzer, Veit (2007). Die Ritterkreuzträger 1939–1945 Die Inhaber des Ritterkreuzes des Eisernen Kreuzes 1939 von Heer, Luftwaffe, Kriegsmarine, Waffen-SS, Volkssturm sowie mit Deutschland verbündeter Streitkräfte nach den Unterlagen des Bundesarchives [The Knight's Cross Bearers 1939–1945 The Holders of the Knight's Cross of the Iron Cross 1939 by Army, Air Force, Navy, Waffen-SS, Volkssturm and Allied Forces with Germany According to the Documents of the Federal Archives] (in German). Jena, Germany: Scherzers Militaer-Verlag. ISBN978-3-938845-17-2.