Type XIV submarine

Type XIV submarine. The Type XIV was a specialized U-boat class of the Kriegsmarine during the Second World War, designed not for direct combat but for replenishing other U-boats at sea. Known colloquially as the *Milchkuh* (Milk Cow), these large submarines carried extra fuel, torpedoes, and provisions to extend the operational range and endurance of the German submarine fleet in the distant Battle of the Atlantic. All ten units constructed were sunk by Allied forces, highlighting their critical yet vulnerable role in the U-boat campaign.

Design and development

The concept for the Type XIV arose from the strategic demands of the Kriegsmarine's Admiral Karl Dönitz, who advocated for a concentrated U-boat offensive against Allied shipping in the Western Atlantic and Caribbean Sea. To support the frontline Type VII submarine and Type IX submarine boats operating far from bases in Occupied France, designers at Deutsche Werke in Kiel and Germaniawerft adapted the hull form of the Type IX submarine. The primary innovation was the elimination of torpedo tubes and a significant reduction in deck armament to create vast internal storage spaces. These submarines could carry approximately 432 tons of additional diesel fuel, 45 tons of lubricating oil, four reserve torpedoes, and substantial quantities of food, fresh water, and medical supplies. Their design also incorporated specialized transfer equipment, including fuel hoses and cargo cranes, to facilitate underway replenishment, often in mid-ocean rendezvous points far from Royal Air Force and United States Navy patrols.

Service history

The service history of the Type XIV was brief but pivotal, entirely defined by the escalating intensity of the Battle of the Atlantic. The first boat, U-459, entered service in late 1941, with operations commencing in earnest during the spring of 1942. These submarines operated as mobile logistics hubs, enabling U-boat wolfpacks to remain on station for weeks longer during critical convoy battles like those against Convoy SC 94 and Convoy ON 166. However, their large size, slow diving speed, and predictable operational patterns made them prime targets for Allied countermeasures. The British Admiralty's Submarine Tracking Room, utilizing decrypted signals from Ultra (cryptography), and aggressive hunter-killer groups centered on escort carriers like USS Bogue, systematically targeted the *Milchkühe*. A decisive turn came in 1943 following major Allied victories at the battles for Convoy ONS 5 and during Black May, after which the last Type XIVs were hunted down. The final boat, U-490, was sunk in June 1944 by the destroyer escort USS Frost and others from Task Group 22.2.

Specifications

The Type XIV had a surfaced displacement of 1,688 tons and a submerged displacement of 1,932 tons. Its overall length was 67.1 meters, with a beam of 9.35 meters and a draught of 6.51 meters. Propulsion was provided by two MAN diesel engines for surface running, generating 2,800–3,200 horsepower, and two Siemens-Schuckert electric motors for submerged travel, producing 750 horsepower. This gave a maximum surface speed of 14.4 to 14.9 knots and a submerged speed of 6.2 knots. Its operational range was exceptional, reaching up to 12,350 nautical miles at 10 knots on the surface. For defense, it was initially armed with two 3.7 cm SK C/30 anti-aircraft guns and one 2 cm FlaK 30 cannon, though this was often augmented. The complement consisted of 53 to 60 crewmen under the command of a Kapitänleutnant.

Operational role

The sole operational role of the Type XIV was fleet replenishment, a force multiplier concept crucial to Admiral Karl Dönitz's tonnage war strategy. By refueling and resupplying attack U-boats in operational areas like the Mid-Atlantic gap and off the Azores, they effectively eliminated the need for long, vulnerable return voyages to bases in Bordeaux or Saint-Nazaire. A single Type XIV could support approximately twelve frontline boats, dramatically increasing the number of U-boats on patrol. This logistical chain was vital during the peak of German success in early 1942, known to U-boat crews as the "Second Happy Time" off the United States coast. However, this specialized mission made them high-value targets, and their loss crippled the sustainability of the U-boat fleet, directly contributing to the collapse of the offensive after 1943. Their operations were coordinated through Befehlshaber der U-Boote using Enigma machine-encrypted signals.

Boats in class

All ten Type XIV submarines were constructed, and all were lost to enemy action. The boats, their commanders, and fates were: U-459 (Georg von Wilamowitz-Moellendorff), scuttled after attack by a Handley Page Halifax of No. 502 Squadron RAF; U-460 (Ebe Schnoor), sunk by aircraft from USS Card; U-461 (Wolf-Harro Stiebler), sunk by a Sunderland flying boat of No. 461 Squadron RAAF; U-462 (Bruno Vowe), sunk by HMS Swale and aircraft; U-463 (Leo Wolfbauer), sunk by a Handley Page Halifax of No. 58 Squadron RAF; U-464 (Otto Harms), scuttled after damage from USS Ingham near Iceland; U-487 (Helmut Metz), sunk by aircraft from USS Core; U-488 (Erwin Bartke), sunk by the destroyer escorts USS Frost and USS Huse; U-489 (Adalbert Schmandt), sunk by a Sunderland flying boat of No. 423 Squadron RCAF; and U-490 (Wilhelm Gerlach), sunk by USS Frost and others. No Type XIV survived the war.

Category:U-boat classes Category:World War II submarines of Germany Category:Submarine classes