Background: The origins of the plan went back to 1928 when Werner von Fritsch started working on it. Fall Weiss was developed primarily by Günther Blumentritt and Erich von Manstein while the two were serving as staff officers under General Gerd von Rundstedt with Army Group South in Silesia. The German invasion began on 1 September 1939, one week after the signing of the Molotov–Ribbentrop Pact, while … Continue reading Case White 1939