Promoted to Major General (Generalmajor) in December 1943, and Lieutenant General (Generalleutnant) in May 1944, he held various commands before being appointed Commander of the 91st Infantry Division in April 1944. Falley was the first German general to fall in action during the Normandy landings. On D-Day, Falley was returning from Rennes, where a war game had been organized by the German High Command, to his Division headquarters, in Picauville.