Poland, France and the Soviet Union Fahrmbacher led the 5th Infantry Division during the
Invasion of Poland and the
Battle of France. On 20 October 1940, he was promoted to
General der Artillerie and appointed commander of the
VII Army Corps, which he led during
Operation Barbarossa as part of
Army Group Centre, fighting in the
Battle of Białystok–Minsk,
Battle of Smolensk (1941),
Battle of Vyazma,
Battle of Moscow and
Battle of Gshatsk.
Brittany Garrison On 1 May 1942, Fahrmbacher assumed command of
XXV Corps manning the
Atlantic Wall in Brittany.
Operation Overlord In May and June 1944, during
Operation Overlord, Fahrmbacher temporarily led the
LXXXIV Corps opposing the US forces in the
Cotentin Peninsula. When
Dietrich von Choltitz took command of LXXXIV Corps, Fahrmbacher returned to his command of XXV Corps, receiving orders to deny Brittany's ports, primarily
Brest,
Lorient,
Saint-Malo and
Saint-Nazaire to the Allies.
Defense of Brittany On 31 July 1944, with US forces breaking out into
Brittany after
Operation Cobra, Fahrmbacher was ordered to send all his mobile troops to hold the
Pontaubault bridge. He dispatched the remnants of the
77th Division and a company of assault guns, which reached Pontaubault in the late afternoon, too late to prevent US forces from advancing over the bridge.
Defense of Lorient Fortress Although XXV Corps theoretically commanded the whole of Brittany, Fahrmbacher was isolated in Lorient and was unable to command the German forces in the fortresses of Brest and St. Malo, exercising command of Lorient and Saint-Nazaire only. On 9 August, the
US 4th Armored Division, led by Major General
John S. Wood, began probing Lorient's defenses, but reported that they were too strong to be quickly captured. Fahrmbacher later stated that had the Americans attacked Lorient before 9 August, they would probably have succeeded. After 10 August, as contact with Saint-Nazaire had been lost and Lorient's fortress commander was injured, Fahrmbacher took direct command of Lorient's defenses. Fahrmbacher's successful defense of the Lorient fortress, which included the nearby Quiberon peninsula, prevented the implementation of
Operation Chastity a plan to develop an artificial port in Quiberon Bay to supply the
Twelfth United States Army Group. The Lorient fortress held out under Fahrmbacher's command for the rest of the war, with Fahrmbacher organizing raids to bring food into the fortress and ordering the adulteration of the troops' bread with sawdust from railway sleepers in order to eke out their rations.
Surrender On 7 May 1945, with
Germany's unconditional surrender, German and American forces met near
Étel to arrange a truce, preparatory to the surrender of the German forces in the Lorient fortress. Three days later, a surrender ceremony took place near
Caudan, during which Fahrmbacher formally surrendered his forces to General
Herman F. Kramer of the
US 66th Infantry Division. Fahrmbacher's last radio message to
Reichspräsident Karl Dönitz on the afternoon of the surrender, was "Wish to sign off with my steadfast and unbeaten men. We remember our sorely tried homeland. Long live Germany!". ==Postwar career and death==