The Monsun Gruppe or Monsoon Group was a force of German U-boats (submarines) that operated in the Pacific and Indian Oceans during World War II. Although similar naming conventions were used for temporary groupings of submarines in the Atlantic, the longer duration of Indian Ocean patrols caused the name to be permanently associated with the relatively small number of U-boats operating out of Penang, (with its capital, George Town)  The Indian Ocean was the only place where German and Japanese forces fought in the same theatre. Arrangements were made to avoid incidents between U-boats and Japanese submarines - attacks on other submarines were strictly forbidden.
Indian Ocean trade routes
The Indian Ocean was considered strategically important, containing not only India, Britain's most prized possession, but also the shipping routes and strategic raw materials that the British needed for their war effort. In the early years of the war German merchant raiders and pocket battleships had sunk a number of merchant ships in the Indian Ocean; however as the war progressed it became more difficult for them to operate in the area and by 1942 most were either sunk or dispersed. From 1941, U-boats were also considered for deployment to this area but due to the successful periods known as the First and Second Happy Times, it was decided that sending U-boats to the Indian Ocean would be an unnecessary diversion. There were also no foreign bases in which units could operate from and be resupplied, hence they would be operating at the limits of their range. As a result the Germans concentrated their U-boat campaign in the North Atlantic.
Japan’s entry into the war in 1941 led to the capture of European South-east Asian colonies such as British Malaya and the Dutch East Indies. In May and June, 1942, Japanese submarines began operating in the Indian Ocean and had engaged British forces in Madagascar. The British had invaded the Vichy-controlled island in order to prevent it from falling into Japanese hands.
Axis strategic raw materials
The German invasion of the Soviet Union in 1941 had ended the use of overland routes which were for the delivery of strategic materials from southeast Asia, and few axis ships were able to avoid Royal Navy patrols of the North Atlantic. Japan was interested in exchanging military technology with Germany, the Japanese submarine I-30 initiated the submerged transport of strategic materials in the summer of 1942 by delivering 1500 kg of mica and 660 kg of shellac. Japanese submarines designed for the vast distances of the Pacific were more capable transports than the compact German U-boats which were designed for operations around coastal Europe; but large Italian submarines had proved ineffective for convoy attacks. The Italian Royal Navy (Regia Marina) converted seven Italian submarines operating from BETASOM into "transport submarines" in order to exchange rare or irreplaceable trade goods with Japan. They were: The Bagnolin, the Barbarigo, the Cappellini (renamed Aquilla III in May 1943), the Finzi, the Giuliani, the Tazzoli and the Torelli.
Joint operations in the Indian Ocean
The idea of stationing U-boats in Malaya and the East Indies for operations in the Indian Ocean was first proposed by the Japanese in December 1942. As no supplies were available at either location, the idea was turned down, although a number of U-boats operated around the Cape of Good Hope at the time. A few days after Cappellini reached the East Indies, U-511 became the first U-boat to complete the voyage. This boat carried the Japanese naval attache Admiral Kichisaburō Nomura from Berlin to Kure. The boat was given to Japan as RO-500; its German crew returned to Penang to provide replacement personnel for the main submarine base being established at a former British seaplane station on the west coast of the Malayan Peninsula. A second base was established at Kobe; small repair bases were located at Singapore, Jakarta and Surabaya. As part of the dispersal of U-boat operations following heavy losses in the North Atlantic during the spring of 1943, Wilhelm Dommes was ordered to sail his U-178 from his operating area off South Africa to assume command at Penang.
Early submarine patrols to Penang
- Japanese submarine I-30 sailed 22 August 1942 carrying German torpedoes, Torpedo Data Computer, search RADAR, Metox, hydrophone array, 50 Enigma machines and 240 Bolde SONAR countermeasure charges. She struck a mine and sank off Singapore on 13 October 1942.
- Tazzoli sailed in a cargo configuration on 21 May 1943 and was sunk by aircraft in the Bay of Biscay.
- Barbarigo sailed in a cargo configuration on 17 June 1943 and was sunk by aircraft in the Bay of Biscay.
- Cappellini sailed in a cargo configuration on 11 May 1943 with 160 tons of mercury, aluminum, welding steel, 20mm guns, ammunition, bomb prototypes, bombsights and tank blueprints; she reached Singapore on 13 July 1943.
- U-511 sailed on 10 May 1943 and sank the 7,200-ton American Liberty Ship Samuel Heintzelman before reaching Penang on 17 July 1943.
- Giuliani sailed in a cargo configuration on 16 May 1943 and reached Singapore on 1 August 1943.
- U-178 sailed on 28 March 1943 and sank the 6,600-ton Dutch freighter Salabangka, the 2,700-ton Norwegian freighter Breiviken, the 6,700-ton British freighter City of Canton, the 7,200-ton American Liberty ship Robert Bacon and the 4,800-ton Greek freighters Michael Livanos and Mary Livanos before reaching Penang on 27 August 1943.
- Torelli sailed in a cargo configuration on 18 June 1943 and reached Penang on 27 August 1943.
First wave of Monsun Gruppe U-boats
With the base established, twelve submarines were assigned to the "Monsun Gruppe" and directed to proceed to Penang, patrolling along allied trade routes for the duration of their voyage. The group name reflected an intent; that the opening of the Indian Ocean U-boat campaign should coincide with the Monsoon season. The Italian armistice with the allies became effective as the operation proceeded. The Italian submarine Ammiraglio Cagni surrendered at Durban, South Africa rather than continuing to Penang. The converted Italian cargo submarines were taken over by the German Navy (Kriegsmarine) and renumbered with UIT prefixes.
- U-200 sailed on 11 June 1943 and was sunk off Iceland by a PBY Catalina on 24 June.
- U-514 sailed on 3 July 1943 and was sunk by a B-24 Liberator of the RAFs 224 Squadron in the Bay of Biscay on 8 July.
- U-506 sailed on 6 July 1943 and was sunk by an American 1st A/S Squadron B-24 Liberator in the Bay of Biscay on 12 July.
- U-509 sailed on 3 July 1943 and was sunk by aircraft from USS Santee on 15 July.
- France on 23 August after transferring its fuel to other boats, enabling them to continue when their tanker was sunk.
- Denmark Strait and was diverted to fuel other boats in the North Atlantic before being sunk by aircraft from USS Card on 27 August.
- Ammiraglio Cagni sailed in combat configuration in early July 1943 but surrendered after the Italian armistice became effective on 8 September 1943.
- U-533 sailed on 6 July 1943 and was sunk by a Bristol Blenheim of 244 Squadron RAF, in the Gulf of Aden on 16 October.
- U-183 sailed on 3 July and reached Penang 27 October 1943, and was sunk two years later in the Java Sea by USS Besugo (SS-321).
- minelaying mission on 22 October 1943 but returned to France on 1 January 1944 after being diverted to fuel other boats in the North Atlantic.
- edit] Later sailings from Europe
Submarines attempting to reach Penang from Europe suffered heavy attrition, first from bombers in the Bay of Biscay, then from air patrols in the mid-Atlantic narrows and around the Cape of Good Hope, and finally from allied submarines lurking around Penang with the aid of decrypted arrival and departure information.
- Japanese submarine I-8 sailed 5 September 1943 with a cargo of anti-aircraft guns, torpedo and aircraft engines, and ten German technicians; and reached Singapore on 5 December 1943.
- U-177 sailed on 2 January 1944 and was sunk by a USN PB4Y Liberator in the South Atlantic on 6 February 1944.
- Bagnolini sailed in a cargo configuration as UIT-22 on 26 January 1944 and was sunk off the Cape of Good Hope by RAF 262 Squadron Catalinas on 11 March.
- batteries, and disappeared in March 1944.
- U-852 sailed 18 January 1944 and sank the 4,700-ton Greek freighter Peleus and the 5,300-ton British freighter Dahomian before being sunk in the Arabian Sea by RAF Vickers Wellingtons on 3 April.
- U-1062 sailed on 3 January 1944 with a cargo of torpedoes and reached Penang on 19 April.
- U-1224 sailed as Japanese RO-501 in April 1944 and was sunk in the Atlantic by USS Francis M. Robinson on 13 May 1944.
- U-843 sailed ón 18 February 1944 and sank the 8,300-ton British freighter Nebraska before reaching Jakarta on 11 June.
- U-490 sailed in an oiler configuration on 6 May 1944 with a cargo of supplies, spare parts and electronics; she was sunk by aircraft from USS Croatan on 12 June 1944.
- Messerschmitt Me 163 and Me 262 fighters on 5 February 1945 and was torpedoed by HMS Venturer on 9 February.
- U-234 sailed in a cargo configuration with 74 tons of lead, 26 tons of mercury, 12 tons of steel, seven tons of optical glass, 43 tons of aircraft plans and parts, 560 kg of uranium oxide and a disassembled Me 262 on 1 April 1945 and surrendered at Portsmouth Naval Shipyard when the war ended.
Submarine patrols from Penang
Although operations from Penang had originally been envisioned as patrols along the trade routes while transporting strategic materials to Europe, many were turned back after allied patrols sank South Atlantic refueling assets.
- Japanese submarine I-30 sailed on 22 April 1942 and reached France on 2 August.
- Japanese submarine I-8 sailed on 27 June 1943 carrying tungsten and an extra crew for U-1224, and reached France in late August 1943.
- Japanese submarine I-34 sailed 12 November 1943 and was torpedoed by HMS Taurus the following day.
- U-178 sailed 27 November 1943 with a cargo of 121 tons of tin, 30 tons of rubber and two tons of tungsten. She sank the 7,200-ton American Liberty ship Jose Navarro before reaching France on 25 May.
- Japanese submarine I-29 sailed 16 December 1943 with a cargo of rubber, tungsten, and two tons of gold; she reached France on 11 March 1944.
- U-532 sailed 4 January 1944 with a cargo of tin, rubber, tungsten, quinine and opium; and sank the 7,200-ton American Liberty ship Walter Camp two ships before returning to Penang after the refueling oiler Brake was sunk.
- U-188 sailed 9 January 1944 with a cargo of tin, rubber, tungsten, quinine and opium; and sank seven British freighters before reaching France on 19 June.
- U-168 sailed 28 January 1944 with 100 tons of tin, tungsten, quinine and opium; and sank a 4,400-ton Greek freighter and the 1,400-ton British repair ship Salviking before returning to Jakarta after Brake was sunk.
- Cappellini sailed for France in a cargo configuration as UIT-24 with about 130 tons of rubber, 60 tons of zinc, five tons of tungsten, 2 tons of quinine, and 2 tons of opium on 9 February 1944; but returned to Penang after Brake was sunk.
- U-183 sailed 10 February 1944 with a cargo of tin, rubber, tungsten, quinine and opium; and sank the 5,400-ton British freighter Palma, the 7,000-ton British tanker British Loyalty and the 5,300-ton British freighter Helen Moller before returning to Penang after Brake was sunk.
- Guiliani sailed for France in a cargo configuration as UIT-23 on 15 February 1944 and was torpedoed three days later by HMS Tally-Ho.
- Japanese submarine I-52 sailed for France in a cargo configuration on 23 April 1944 with a cargo including two tons of gold and was sunk by TBF Avengers from USS Bogue on 23 June 1944.
- U-183 sailed on 17 May 1944 and sank one ship before returning to Penang on 7 July.
- U-1062 sailed for France in a cargo configuration on 6 July 1944 and was sunk in the Atlantic on 5 October.
- U-168 sailed 4 October 1944 and was torpedoed two days later by Zwaardvisch.
- U-181 sailed 19 October 1944 and sank one ship before returning to Jakarta on 5 January 1945.
- U-537 sailed 8 November 1944 and was torpedoed the following day by USS Flounder.
- U-196 sailed 11 November 1944 and disappeared while traversing an allied minefield.
- U-862 sailed 18 November 1944 and sank two ships in the only German U-boat Pacific patrol of the war before returning to Jakarta on 15 February 1945.
- U-843 sailed for Norway on 10 December 1944 and was sunk in the Kattegat by RAF Mosquitoes on 2 April 1945.
- U-510 sailed for Norway with 150 tons of tungsten, tin, rubber, molybdenum and caffeine on 6 January 1945; and sank the 7,100-ton Canadian freighter Point Pleasant Park before surrendering in France.
- U-532 sailed for Norway on 13 January 1945 with a cargo of 110 tons of tin, eight tons of tungsten, eight tons of rubber, four tons of molybdenum and smaller quantities of selenium, quinine, and crystals. The type IXC40 boat sank the 3,400-ton British freighter Baron Jedburgh and the 9,300-ton American tanker Oklahoma; and surrendered at Liverpool when the war was over.
- U-861 sailed 14 January 1945 with 144 tons of tungsten, iodine, tin, and rubber; and arrived in Norway on 18 April.
- U-195 sailed for Norway in an oiler configuration on 17 January 1945 but returned to Jakarta on 3 March after experiencing engine trouble.
- U-183 sailed on 24 April 1945 and was torpedoed two days later by USS Besugo.
- U-181 (type IXD2 cruiser) became I-501 and was scrapped at Singapore after Japan surrendered.
- U-862 (type IXD2 cruiser) became I-502 and was scrapped at Singapore after Japan surrendered.
- UIT-24 (originally Cappellini, then Aquilla III) became I-503 and was found at Kobe when Japan surrendered and scuttled by the US navy in Kii Suido.
- UIT-25 (originally Torelli) became I-504 and was found at Kobe when Japan surrendered and scuttled by USN in Kii Suido.
- U-219 (type XB minelayer) became I-505 and was scrapped at Jakarta after Japan surrendered.
- U-195 (type IXD1 oiler) became I-506 and was scrapped at Jakarta after Japan surrendered.
- ^ Paterson Lawrence(2004), Hitler's Grey Wolves: U-boats in the Indian Ocean p.29
- ^ Paterson Lawrence (2006), Hitler's Grey Wolves: U-boats in the Indian Ocean
- ^ a b Blair, Clay Hitler's U-Boat War: The Hunted 1942-1945 (1998) Random House ISBN 0-679-45742-9 p.231
- ^ Paterson (2004), p.33
- ^ Klemen, L (1999-2000). "The U-Boat War in the Indian Ocean". Forgotten Campaign: The Dutch East Indies Campaign 1941-1942. http://www.dutcheastindies.webs.com/u-boatindia.html.
- ^ Pre-Monsun Boats
- ^ a b Blair, Clay Hitler's U-Boat War: The Hunted 1942-1945 (1998) Random House ISBN 0-679-45742-9 p.239
- ^ Monsun boats
- ^ a b c d e f g h i Brice, Martin Axis Blockade Runners of World War II (1981) Naval Institute Press ISBN 0-87021-908-1 pp.131-133
- ^ a b c d e f g h i j k l m n o p Blair, Clay Hitler's U-Boat War: The Hunted 1942-1945 (1998) Random House ISBN 0-679-45742-9 pp.772-775
- ^ Fate of the Far Eastern Boats
- ^ Monsun boats Evacuation
- ^ Lenton, H.T. German Warships of Second World War (1976) Arco ISBN 0-668-04037-8 p.192
- ^ Lenton, H.T. German Warships of Second World War (1976) Arco ISBN 0-668-04037-8 p.191
- ^ a b Taylor, J.C. German Warships of World War II (1966) Doubleday & Company pp.129-130
- ^ Lenton, H.T. German Warships of Second World War (1976) Arco ISBN 0-668-04037-8 p.222
- ^ Blair, Clay Hitler's U-Boat War: The Hunted 1942-1945 (1998) Random House ISBN 0-679-45742-9 p.747
- ^ a b c d e f g Taylor, J.C. German Warships of World War II (1966) Doubleday & Company pp.138-141
- ^ a b c Taylor, J.C. German Warships of World War II (1966) Doubleday & Company pp.117-118
- ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa Brice, Martin Axis Blockade Runners of World War II (1981) Naval Institute Press ISBN 0-87021-908-1 pp.145-149
- ^ Taylor, J.C. German Warships of World War II (1966) Doubleday & Company p.145
- ^ Taylor, J.C. German Warships of World War II (1966) Doubleday & Company p.147
- ^ Lenton, H.T. German Warships of Second World War (1976) Arco ISBN 0-668-04037-8 p.190
- ^ Taylor, J.C. German Warships of World War II (1966) Doubleday & Company p.121
- ^ Brice, Martin Axis Blockade Runners of World War II (1981) Naval Institute Press ISBN 0-87021-908-1 p.136
- ^ Brice, Martin Axis Blockade Runners of World War II (1981) Naval Institute Press ISBN 0-87021-908-1 pp.136&145
- ^ Taylor, J.C. German Warships of World War II (1966) Doubleday & Company pp.118-119,140&163
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