BdU (Befehlshaber der U-Boote)
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| BdU (Befehlshaber der U-Boote) | |
|---|---|
| Unit name | BdU (Befehlshaber der U-Boote) |
| Native name | Der Befehlshaber der U-Boote |
| Dates | 1918–1945 (principal usage 1939–1945) |
| Country | German Empire, Weimar Republic, Nazi Germany |
| Branch | Kaiserliche Marine / Reichsmarine / Kriegsmarine |
| Type | Naval command |
| Role | Submarine warfare command |
| Garrison | Wilhelmshaven, Hamburg, Bremen |
| Notable commanders | Karl Dönitz, Erich Raeder |
BdU (Befehlshaber der U-Boote) BdU (Befehlshaber der U-Boote) was the senior operational command responsible for German submarine forces during periods encompassing the late German Empire, the Weimar Republic and predominantly Nazi Germany. It directed submarine construction, training and deployment in major conflicts including World War I and World War II, interacting with naval institutions such as the Reichsmarine and Kriegsmarine. BdU's decisions influenced Atlantic naval campaigns against the Royal Navy, United States Navy, and merchant convoys associated with Allied convoys.
History
The office originated from submarine coordination offices in the aftermath of World War I and evolved through the Interwar period alongside figures like Erich Raeder and Karl Dönitz. During the Spanish Civil War, lessons from deployments informed BdU doctrine that later shaped operations in World War II, including campaigns in the Atlantic Ocean, North Sea, Mediterranean Sea, and off the coasts of West Africa and the Caribbean Sea. Post-Battle of the Atlantic, BdU adapted to technological shifts prompted by encounters with the Royal Navy, United States Coast Guard, Royal Australian Navy, and Royal Canadian Navy.
Organization and Command Structure
BdU functioned within the staff framework of the Kriegsmarine under the political shadow of the Oberkommando der Kriegsmarine. Its chain involved coordination with the Reichsluftfahrtministerium for maritime patrols, the Abwehr for intelligence, and the Oberkommando der Wehrmacht for strategic directives during joint operations such as those involving the Luftwaffe and Heer. Subordinate units included flotillas operating from bases in Kiel, Lorient, St. Nazaire, La Rochelle, Brest, and Trondheim. BdU liaised with shipyards like AG Weser, Deutsche Werke, and Howaldtswerke-Deutsche Werft for construction and with training establishments at Kiel-Holtenau and Flensburg.
Operations and Strategy
BdU developed wolfpack tactics tested in engagements with Convoy HX 84, Convoy SC 7, Convoy HX 229/SC 122, and against task forces like those centered on HMS Hood and USS Reuben James. Strategy combined long-range patrols into the Mid-Atlantic Gap, night surface attacks, and coordinated strikes leveraging intelligence from B-Dienst, decrypted intercepts from Enigma, and reconnaissance by Focke-Wulf Fw 200 Condor. BdU adjusted to Allied countermeasures including ASDIC, Huff-Duff, escort carriers such as HMS Audacity, and technologies developed by Bletchley Park and Navy Operational Intelligence Center. Campaigns intersected with operations in the Arctic convoy routes to Murmansk and Archangelsk supporting the Soviet Union.
Key Commanders
Prominent officers associated with the office and its hierarchy included Karl Dönitz, who advanced submarine doctrine and later assumed grand command responsibilities; Erich Topp as a notable U-boat ace; Otto Kretschmer, commander with significant tonnage successes; Gunther Prien known for the Scapa Flow raid; Heinrich Lehmann-Willenbrock associated with the Battle of the Atlantic; Walter Schultze and Hans-Rudolf Rösing in staff and flotilla roles. BdU's interactions extended to senior naval leaders such as Wilhelm Canaris and political authorities including Adolf Hitler and Hermann Göring over allocation of resources and strategic priorities.
U-boat Campaigns and Impact
Under BdU direction, U-boat campaigns targeted merchant shipping tied to convoys like PQ 17 and QP 14, affecting supply lines to United Kingdom and Soviet Union. Major engagements included attacks on convoys in the North Atlantic, the South Atlantic, and coastal operations against the United States following the Germans' undeclared war in the Atlantic. The campaigns provoked Allied measures such as the Liberty ship program, the formation of MHQ, and multinational escorts from Royal Navy, United States Navy, Royal Canadian Navy, Free French Naval Forces, and Royal Netherlands Navy. The strategic toll included shifts in industrial production at Harland and Wolff and Bethlehem Steel yards and influenced postwar naval doctrine examined at conferences like Potsdam Conference.
Equipment and Bases
BdU oversaw deployment of U-boat classes including Type VII, Type IX, Type XXI, and earlier Type II coastal submarines, built by firms such as Krupp Germaniawerft, Vegesack shipyard, and Blohm & Voss. U-boat armaments included G7e torpedo variants, deck guns like the 88 mm SK C/35, and sensors integrating Schnorchel technology. Primary bases included Atlantic submarine pens at Lorient, Saint-Nazaire, Brest, and La Pallice fortified with submarine pens constructed by Organisation Todt, as well as Baltic training and repair facilities at Kiel and Danzig. Allied bombing by RAF Bomber Command and United States Army Air Forces targeted these installations, while postwar salvage and occupation by Royal Navy and United States Navy forces addressed remaining U-boats and infrastructure.