User:Keith-264/sandbox5

Auxiliary cruisers (raiders) were, for a small outlay in crews and material, a means of oceanic operations for the {{lang|de|Kriegsmarine}} that could

force the Allies into considerable counter-measures, divert ships and aircraft and inflict considerable attrition on merchant ships through sinking or capture. The {{lang|de|Seekriegsleitung}} (Naval War Staff) used the experience of the First World War to convert ships into disguised auxiliary cruisers, with fairly heavy gun- and torpedo-armament and from 1942 radar. High cruising speeds of {{cvt|14|–|18|kn}} and long endurance were necessary. SKL planned to use wireless to direct raiders to different areas and to give a running commentary on circumstances by passing on wireless intelligence.{{sfn|Rahn|2001|pp=425–426}}

SKL strategy was to tie down and disrupt Allied sea operations, rather than obtain a high number of sinkings at the risk of the loss of raiders. Ship captains were directed to make surprise appearances, to force the Allies into diverting many ships for trade protection. Tankers and supply ships were to fuel, provision and supply the raiders by exploiting the inability of the Admiralty to maintain a continuous watch over the oceans. Merchant ships, were to be taken {{em|silently}} by preventing them from sending distress signals. Raiders were to transfer captured crews of merchant ships to the supply ships.{{sfn|Rahn|2001|pp=425–426}}

Each ship would need a crew of 284 men, six {{cvt|150|mm|in}}-guns, four 20 mm anti-aircraft guns, four torpedo tubes, provision for 400 mines, two seaplanes and some ships carried a light, fast E-boat for mining harbour entrances and surprise night attacks against merchant ships. The ships needed to be at sea for a year-long cruises of {{cvt|40000|nmi}}. The first raider was to sail in November 1939 but it took until 31 March 1940 before it sailed and July before all of the first wave had departed. By March 1941 the seven raiders in action had sunk or taken 80 ships of {{nowrap|494,291 gross register tons}} (GRT).{{sfn|Stegemann|2015|pp=349–350}}

{{main|B-Dienst}}

The German {{lang|de|Beobachtungsdienst}} ({{lang|de|B-Dienst}}, Observation Service) of the {{lang|de|Kriegsmarine}} {{lang|de|Marinenachrichtendienst}} (MND, Naval Intelligence Service) had broken several Admiralty codes and cyphers by 1939, which were used to help Kriegsmarine ships elude British forces and provide opportunities for surprise attacks. In 1941, {{lang|de|B-Dienst}} read signals from the Commander in Chief Western Approaches informing convoys of areas patrolled by U-boats, enabling the submarines to move into "safe" zones.{{sfn|Kahn|1973|pp=238–241}} {{lang|de|B-Dienst}} broke Naval Cypher No 3 in February 1942 and by March was reading up to 80 per cent of the traffic, which continued until 15 December 1943. By coincidence, the British lost access to the Shark cypher and had no information to send in Cypher No 3 which might compromise Ultra.{{sfn|Budiansky|2000|pp=250, 289}}

The cargo ship Santa Cruz ({{GRT|3,863}}, {{DWT|5,170}}) was {{cvt|400.4|ft}} long, with a beam of {{cvt|54.6|ft}}, a draught of {{cvt|23.4|ft}} and a speed of {{cvt|16|kn}}. The ship was built by Deutsche Werft, Hamburg, (DWH) in 1938 and was owned and operated by the Oldenburg Portuguese Line (OPDR), Hamburg.{{sfn|Jordan|2006|p=76}} In the winter of 1939–1940 the {{lang|de|Kriegsmarine}} requisitioned the ship and had DWH convert it into an auxiliary warship by DWH. The ship was commissioned as the {{lang|de|Hilfskreuzer}} (commerce raider) Thor on 15 March 1940.{{sfn|Jordan|2006|p=477}}

Pre-war thinking at the Admiralty under-estimated the threat from U-boats and expected that the principal weapon of the {{lang|de|Kriegsmarine}} would be the commerce raider. Between the wars the Admiralty and the Royal Air Force had never agreed about the control of maritime aircraft or grasped the role and effectiveness of aircraft over the seas, their strategy and tactics or their design and armament. In 1939 the Germans could only reach the high seas via the Scotland–Iceland gap or the Denmark Strait between Iceland and Greenland. The Admiralty revived the Northern Patrol to intercept Blockade runners and detect the passage of German {{sclass|Deutschland|cruiser}}s (pocket battleships) that had been built as commerce raiders.{{sfn|Beesly|2015|pp=46–47}}{{efn|{{ship|German cruiser|Deutschland||2}}, {{ship|German cruiser|Admiral Scheer||2}} and {{ship|German cruiser|Admiral Graf Spee||2}}{{sfn|Beesly|2015|pp=25–52}}}} In late 1940 the Operational Intelligence Centre created a sub-section to concentrate on armed merchant raiders to collect information that a raider was at sea based on ship disappearances, survivor reports on the appearances of raiders, their tactics and armaments, the presence of mines and the analysis of times and distances to infer the number of raiders.{{sfn|Beesly|2015|pp=64–65}}

As the presence of a raider was established it received a code letter, beginning with Raider A. It was discovered that the Germans named the ships and gave them a number (Thor [Raider E] was {{lang|de|Schiff}} 10). From May 1941 a supplement of the Weekly Intelligence Report listed raiders, their size, speed, armament, captain, drawings or photographs their characteristics, tactics and a digest of their cruises. The wireless signal QQQQ was established for attacks by merchant raiders to go with RRR for attack by any ship and SSS for submarine attack. In May 1941 the cruiser {{HMS|Cornwall|56|6}} intercepted a distress message from a tanker in the Indian Ocean that led to the sinking of Raider F ({{ship|German auxiliary cruiser|Pinguin||2}} {{lang|de|Schiff 33}}) that had been at sea for close to a year, sank or took as Prize of war 17 ships and 11 whalers of 136,000 GRT. The seven raiders at see between April 1940 and November 1941 sank or took as prizes 87 ships of over 600,000 GRT.{{sfn|Beesly|2015|p=66}}

File:Norwegian Sea map.png and the Denmark Strait}}]]

Thor (Captain Otto Kähler) began its first cruise on 6 June 1940, altered to look like the Russian freighter Orsk from Odessa.{{sfnm|1a1=Rohwer|1a2=Hümmelchen|1y=2005|1p=27|2a1=Duffy|2y=2001|2p=80}} The ship was escorted into the North Sea by destroyers, minesweepers and aircraft. The British and French were evacuating troops from Harstad in the north of Norway, with a lot of ships in the area. As the ship sailed northwards, the weather deteriorated, enveloping the ship in fog and snow, despite the Midnight sun and it passed unseen. Thor/Orsk passed through the Denmark Strait and reached the North Atlantic on 16 June. On 22 June, Kähler reported to Berlin that Thor was west of the Azores and had changed disguise to the neutral Vir a Jugoslavian ship from Split.{{sfnm|1a1=Hampshire|1y=1980|1p=180|2a1=Duffy|2y=2001|2pp=80–81}}

On 1 July, Thor/Vir, met the 9,289 GRT Dutch cargo ship Kertosono, which was carrying a cargo of petrol, timber, asphalt and agricultural machinery. Kähler decided to send it under a prize crew to Lorient in France, where it arrived on 12 July.{{sfnm|1a1=Poolman|1y=1985|1p=159|2a1=Rohwer|2a2=Hümmelchen|2y=2005|2p=22}} On 7 July, just south of the Equator, Thor encountered Delambre, a British 7,030 GRT freighter carrying hides and cotton to Britain. Delambre turned away leading to a stern chase and ehen Thor had closed the range to about {{cvt|8000|yd}} several broadsides, were fired, the third of which hit Delambre and stopped it. A boarding party took the crew of 44 and a passenger prisoner and scuttled the ship with demolition charges.{{sfn|Duffy|2001|p=81}}

{{Location map-line|lat=0|caption={{center|The Equator}}}}

Two days later on 9 July, Thor intercepted the Belgian freighter Bruges, bound for Freetown with {{cvt|7000|LT}} of wheat. Bruges was scuttled and its crew of 44 was taken aboard Thor. On 14 July, Thor stopped Gracefield another British freighter carrying {{cvt|7000|LT}} of wheat and bran from Montevideo. The 36-man crew was taken prisoner and two torpedoes were fired at the ship, one hit and the other circled the ship until it ran out of fuel; the ship was sunk by gunfire.{{sfnm|1a1=Jordan|1y=2006|1pp=443, 494, 497|2a1=Duffy|2y=2001|2p=81}}

On 16 July Thor spotted a large plume of smoke that tuned out to be the British freighter Wendover (5,489 GRT) carrying coal to Buenos Aires. Thor approached by hiding in the smoke plume and opened fire without warning, as Wendover was seen to have two guns at the stern. Wendover was hit by several shells and set on fire. The wireless operator began sending "QQQQ" and one of the crew was seen running towards one of the guns at the stern. Another salvo hit the wireless cabin and killed the operator and with the fires spreading, the captain stopped the ship. Kahler sent a boarding party over that set demolition charges. When the charges detonated Wendover capsized and she was sunk by gunfire. Two members of the crew were killed in the attack, 37 were taken prisoner, two of whom were mortally wounded and died on board Thor, being buried at sea.{{sfnm|1a1=Duffy|1y=2001|1pp=81–82|2a1=Jordan|2y=2006|2p=516}}

The Dutch freighter Tela, carrying {{cvt|5451|LT}} of grain to Britain was intercepted on 17 July, Thor firing a shot across its bow and it stopped without sending distress signals. The crew of 33 abandoned ship and were taken aboard Thor and the ship was sunk with demolition charges. IN just over two weeks Thor had sunk six ships of 35,201 GRT and carried 194 prisoners. For ten days Thor stayed in the south Atlantic off the Brazilian coast. The prisoners were roused at {{nowrap|6:00 a.m.}} for roll call at {{nowrap|6:00 a.m.}} then after breakfast, shifts of 60–70 came on deck for sun, exercise and fresh air{{sfn|Jordan|2006|p=553}}{{sfn|Duffy|2001|p=82}}

File:HMS Alcantara FL386.jpg]]

On 28 July, Thor encountered a grey-painted ship that was hard to identify and eavesdropped on a wireless message reporting Thor and calling for help. The ship was the armed merchant cruiser HMS Alcantara, with a main armament of eight BL 6-inch Mk XII naval guns (150 mm) two 3-inch guns and sundry anti-aircraft guns. Admiral Henry Harwood the commander of the South American Division, North America and West Indies Station had reacted to the number of overdue ships and Admiralty signals intelligence that raiders were operating in the South Atlantic. Using reports of survivors Harwood inferred that a raider was moving southwards and sent Alcantara to search for it. At about {{nowrap|9:00 a.m.}} on 28 July off Argentina on a clear day with a calm sea, lookouts on Alcantara spotted a strange ship that turned away at high speed, arousing the suspicions of the captain, James Ingham.

Alcantara was capable of {{cvt|19|kn}}, {{cvt|2|kn}} faster than the other ship (Thor) and at about {{nowrap|2:00 p.m.}} when the range was about {{cvt|17350|yd}} Kähler decided to try to inflict enough damage on Alcantara to escape. Thor gained three early hits on Alcantara, one between the bridge and funnel, a second aft and a third on the waterline that caused flooding in its engine room, forcing Alcantara to reduce speed. Alacantara replied with its 6-inch guns but was out-ranged by about {{cvt|2000|yd}} and facing the sun, making it harder aim. After the fire control system was damaged, the gunners had to fire independently. Despite the difficulties, Thor was hit several times, one shell passing unexploded through the hull and damaging a shell hoist; another shell hit the boat deck and put the torpedo fire control system out of action. Using its reserve W/T, Alcantara sent "Enemy approximately 8,000 tons, speed 19 knots, armament four 5.9-inch guns". Thor turned away from Alcantara that had lost speed due to the shell-damage and instead of fighting on, Thor escaped under a smokescreen and changed disguise once out of sight.{{sfnm|1a1=Duffy|1y=2001|1pp=77–80|2a1=Poolman|2y=1985|2pp=158–164}}

After the battle with Alcantara, the Thor crew repaired the damage, cleaned boilers and changed their disguise. Thor rendezvoused with the supply ship Rekum on 25 August and then returned to Brazilian waters. Two weeks later, on Sept 8, the Yugoslav Federico Glavic was stopped, but allowed to proceed unmolested, as Yugoslavia was neutral at the time. On 26 September Thor{{'}}s float plane discovered the Norwegian whale-oil tanker Kosmos (17,801 GRT), which was carrying over 17,000 tons of whale oil.{{sfn|Rohwer|Hümmelchen|2005|p=43}} The Kosmos would have been a highly valuable prize ship, but the fact that she was short of fuel, slow, and easily recognisable meant that taking as a prize was impractical and Kähler ordered the sinking of Kosmos by gunfire.{{sfn|Duffy|2001|pp=83–84}}

On 8 October Thor caught the 8,715 GRT British reefer Natia. Thor achieved a direct hit, which stopped Natia, though she continued wireless transmissions. Thor hit Natia seven or eight more times with gunfire, and a torpedo that tore open its side. Another 35 rounds were fired before she sank. One crewman was killed and 84 crew (one mortally wounded) were taken aboard Thor, bringing its total of prisoners to 368.{{sfn|Jordan|2006|p=505}} Most of the prisoners were transferred to the supply ship Rio Grande in mid November.{sfn|Duffy|2001|p=85}}

File:Postcard RMMV Carnarvon Castle.jpg

On 5 December, at {{nowrap|5:30 a.m.}} south-east of Rio de Janeiro, Thor encountered another armed merchant cruiser, HMS Carnarvon Castle (20,062 GRT) armed with eight 6-inch guns, four on each side, two 3-inch anti-aircraft guns and various light weapons. Three of the four {{convert|15|cm|2|abbr=on}} guns on Thor were aft and Kähler decided to force Carnarvon Castle into a stern chase. At {{nowrap|7:01 a.m.}} Carnarvon Castle fired a shot that fell {{cvt|300|yd}} from Thor that raised the German ensign and began a turning engagement, both ships trying to manoeuvre to get the sun in the opponent's eyes, that lasted for about half an hour at a range of {{cvt|7000|–|8000|yd}}. Thor made as much smoke as possible and fired two torpedoes that missed. The gun crews on Thor found their target five shells, that started three fires and knocked out the fire control system, leaving the gun crews to fire independently.

Thor was a much smaller target and received no hits. At {{nowrap|8:05 a.m.}} having been hit eight times, Carnarvon Castle turned away, dropped smoke floats and headed for Montevideo in Uruguay for repairs, with six men killed and 32 wounded. Thor suffered several guns jammed through overheating but these could be repaired as Thor sailed south at speed to avoid British ships that Kähler expected to join the search. Over 67 per cent of the ammunition for the main guns had been fired in the engagement and much fuel expended, replenished by Eurofeld on 21 December.{{sfn|Duffy|2001|pp=83–84}} A search to find Thor by the cruisers {{HMS|Cumberland|57|6}}, {{HMS|Enterprise|D52|2}} and {{HMS|Newcastle|C76|2}} failed.{{sfn|Rohwer|Hümmelchen|2005|p=51}} Thor was ordered to rendezvous with the {{ship|German pocket battleship|Admiral Scheer}} to transfer men for prize crews for the whalers taken as prizes by {{ship|German auxiliary cruiser|Pinguin||2}}. The ships met on 25 December with the British reefer ship Duquesa, a prize taken by Admiral Scheer and the tanker Nordmark.{{sfn|Poolman|1985|p=177}}

In February Thor was fuelled by the tanker {{MV|Eurofeld}} and again in March by {{MV|Alsterufer}}, then Thor rendezvoused with the ten whalers captured by Pinguin.{{sfn|Poolman|1985|p=181}} On 25 March Thor intercepted {{SS|Britannia|1925|2}}, an 8,800 GRT British passenger ship. After scoring several hits on the ship, Kähler allowed time for it to be abandoned, before sinking it with sixteen {{cvt|15|cm|in|2}} shells to the waterline. The wireless operators intercepted a message from a nearby British warship, approaching at full speed from a distance of about {{cvt|100|nmi}}. Kähler assumed that the British ship would arrive and rescue the survivors. Kähler contacted Berlin as he left but the ship failed to find the survivors and 331 out of approximately 520 survivors were rescued by the Spanish ships Cabo de Hornos, Raranga and Bachi. Thirty-three survivors reached land at Sao Luis, Brazil, after 23 days and {{cvt|1500|nmi}} adrift at sea.{{sfn|Duffy|2001|pp=89–90}} On the same day Thor stopped the 5,045 GRT Swedish {{MV|Trollenholm}}, though neutral the ship was found to have been chartered by the British to take coal from Newcastle to Port Said. The 31 crewmen were quickly transferred to Thor and the freighter was sunk with demolition charges.{{sfn|Duffy|2001|p=91}}

{{main|Action of 4 April 1941}

File:StateLibQld 1 169627 Voltaire (ship).jpg.]]

On the return journey to Germany, just after dawn, Thor, under a Greek flag, encountered {{HMS|Voltaire||6}} (13,302 GRT) an armed merchant cruiser about {{cvt|900|nmi}} west of the Cape Verde islands. Voltaire carried eight {{cvt|6|in}} and three {{cvt|3|in}} guns. Thor approached head on and in response to Voltaire's AAA signals (an order for a ship to identify itself), fired a shot across Voltaire's bow. Thor{{'}}s first salvo hit Voltaire{{'}}s generator and radio room, rendering it unable to transmit signals. Voltaire opened fire but with the electrical circuits out of action the guns had to be worked individually. Voltaire managed only one hit on Thor, disabling the radio aerial. Voltaire{{'}}s obsolete guns overheated and had to cease firing, at which point Voltaire was at {{cvt|7000|yd}} circling at {{cvt|12|kn}} ablaze and with a jammed rudder.{{sfnm|1a1=Rohwer|1a2=Hümmelchen|1y=2005|1p=67|2a1=Brown|2y=1995|2p=43|3a1=Poolman|3y=1985|3pp=182–183}}

At a range of {{cvt|2000|yd}} Thor prepared to launch torpedoes but saw men jumping into the water, the remaining guns ceased fire and men on the poop deck waved improvised white flags. Kähler laid off at {{cvt|4000|yd}} and began rescuing Voltaire{{'}}s crew, the Germans in their boats standing ready to fend off sharks with rifles and machine-guns. Having disabled the wireless on Voltaire, Kähler felt safe to concentrate on the rescue for five hours. The captain and 196 men were rescued out of the 296 crew; the ship sank at 14°25′N, 40°40′W.{{sfnm|1a1=Rohwer|1a2=Hümmelchen|1y=2005|1p=67|2a1=Brown|2y=1995|2p=43|3a1=Poolman|3y=1985|3pp=182–183}} Thor sailed north-west and transferred 170 prisoners to the tanker Ill on 14 April.{{sfn|Poolman|1985|p=183}} On 16 April, on the return voyage to Germany, Thor encountered the Swedish ore carrier Sir Ernest Cassel (7,738 GRT). Two warning shots were fired, which stopped the ship and the crew was taken aboard Thor; demolition charges were used to scuttle the ship at 32°N, 35°W.{{sfn|Jordan|2006|p=573}} On 23 April Thor reached the Bay of Biscay, having spent 329 days at sea and had sunk or captured twelve ships of 96,547 GRT.{{sfnm|1a1=Rohwer|1a2=Hümmelchen|1y=2005|1p=70|2a1=Duffy|2y=2001|2p=94}}

File:Southern Hemi Antarctica.png and clockwise from north, the South Atlantic, Indian Ocean and the Pacific Ocean}}]]

When Thor was refitted, the old guns had been replaced with newer guns and radar. The new captain, {{lang|de|Kapitän zur See}} Günther Gumprich took nearly fifty of the crew from the first cruise.{{sfn|Duffy|2001|p=94}}{{efn|Since then the Empire of Japan had entered the war on 7–8 December and Germany had declared war on the United States on 11 December.{{sfn|Duffy|2001|p=94}}}} After colliding in fog with Bothnia (1,343 GRT) a Swedish ore carrier, that sank quickly but with no casualties; Thor had returned to dry dock in Kiel for repairs to its bow. The second cruise recommenced on 30 November 1941 and Thor sailed along the French coast.{{sfn|Jackson|2000|pp=77, 71}} Storms delayed it in the Bay of Biscay until 14 January when it entered the Atlantic and turned south for the Antarctica looking for whalers. Thor was to relieve Kormoran (HSK 8, Raider G to the British) in the Indian Ocean.{{sfn|Duffy|2001|p=94}}

Thor voyaged into the Southern Ocean and crossed the Antarctic Circle on 25 February. The area was searched with the Arado 196A-1 for the whaling fleet. Short wave wireless transmissions suggested that whalers were operating in the vicinity but nothing was found. After a few days Thor turned north north towards the South Atlantic shipping lanes. In the 23 March twilight, lookouts spotted smoke thought to be Regensburg that was due to rendezvous with Thor but it turned out to be the Greek freighter Pagasitikos (3,490 GRT). To save the crew, the captain stopped as ordered and did not send a sighting report, Thirty-two men and a woman were taken prisoner and the ship sunk with a torpedo. On 24 March Regensburg appeared about {{cvt|1000|nmi}} west of the Orange River and Thor replenished; Regensburg then circled Thor for the radar operators to practice. On 28 March, Thor chased a ship for three hours after lookouts saw masts on the horizon but the ship was too fast to catch and the Arado was not used.{{sfnm|1a1=Duffy|1y=2001|1pp=94–95|2a1=Woodman|2y=2005|2p=470}}

Late in the morning of 30 March, about {{cvt|700|nmi}} south-west of St Helena, the Arado crew reported that a British ship was steaming parallel to Thor over starboard horizon. Gumprich increased speed and turned onto a converging course towards the British freighter Wellpark (4,470 GRT), carrying military equipment from St John's to Alexandria. The crew of Wellpark were unawares until {{nowrap|1:00 p.m.}} when Thor drew nearer. The captain ordered a close watch to be kept on the ship as it converged and tried to identify it. Just after {{nowrap|3:00 p.m.}} the Arado took off and on Wellpark the captain ordered the anti-aircraft gunners to action stations on the 12-pounder gun. The captain of Wellpark saw an Arado Ar 196 A-1 trailing a wire with hooks and the pilot opened fire with its two 20 mm cannon, the Wellpark gunners replying. After hitting the bridge, the Arado dragged its line across the aerial mast taking away the aerial. The Arado crew and the ship gunners continued to exchang fire until Thor came close enough to use its guns, penetrating Wellpark just above the waterline and near the boiler room. Wellpark came to a stop after fifteen minutes, seven men having been killed; once the 41 survivors were taken prisoner, the ship was sunk by gunfire.{{sfnm|1a1=Duffy|1y=2001|1pp=96–97|2a1=Woodman|2y=2005|2pp=470−471}}

{{clear}}

File:Arado 196.jpg

On 1 April Thor intercepted the British 4,565 GRT Willesden about {{cvt|475|nmi}} west south-west of St Helena from New York bound for Alexandria. Gumprich stalked the ship for twelve hour and then the Arado demolished the wireless aerials with its grapnel and dropped two bombs. The gunners on Thor fired 128 shells that set fire to the deck cargo of oil drums and destroying the bridge. Willesden returned fire but managed only six shells; with one dead and six wounded (four mortally) the ship was abandoned and 42 of the crew were taken prisoner. Thor sank the ship with a torpedo. On 3 April the Norwegian freighter Aust (5,630 GRT) fell victim to the same tactics and was unable to send a wireless signal before being hit by gunfire and brought to a stop by the crew who abandoned the vessel. A boarding party inspected the ship and sank it by demolition charge, the crew becoming prisoner.{{sfnm|1a1=Woodman|1y=2005|1p=471|2a1=Duffy|2y=2001|2p=98}} From 23 March to 9 April, Thor sank five ships of 23,623 GRT).{{sfn|Rohwer|Hümmelchen|2005|p=154}}

On 10 April Thor detected the 4,840 GRT British tramp steamer Kirkpool, bound for Montevideo from Durban, on radar, the first to be installed on a commerce raider. Having followed the ship all day in poor visibility, with night falling, Gumprich closed in and opened fire with its {{convert|15|cm|2|abbr=on}} guns. The second salvo obtained three hits and set Kirkpool's bridge and wheelhouse on fire. With the helm unattended, the ship veered, in what from Thor looked like a ramming attempt. With the ship on fire, the captain ordered the crew to abandon ship and Kirkpool sank as the crew jumped overboard; sixteen men were lost and Thor lingered for three hours looking for survivors, helped by the red lights on new life jackets being issued to British merchant ships; 30 men were rescued, including Kirkpool{{'}}s captain, chief engineer and first officer. The ship was sunk with a torpedo. Soon afterwards, Thor was ordered into the Indian Ocean by SKL with a warning to be aware of Japanese submarines operating in the area. SKL hoped that the raider could continue its run of success that in under a month attacks had been near the Cape of Good Hope, in shipping lanes; five ships had been sunk for a total of 23,176 GRT.{{sfn|Duffy|2001|pp=98–99}}

File:Indian Ocean laea relief location map.jpg}}]]

On 10 May Thor's seaplane sighted the 7,130-ton Australian liner Nankin, en route to Bombay. From a range of 13,000 yards Thor opened fire with its {{convert|15|cm|in|2|abbr=on}} guns, scoring several hits. Nankin{{'}}s captain gave the order to abandon ship and lowered his flags. The crew attempted to scuttle it but the German boarding party managed to repair the ship's engines. Nankin was renamed Leuthen and taken as a prize ship to rendezvous with Regensburg. Following supply and prisoner transfer, Leuthen and Regensburg sailed to Japanese-held ports. Nankin was carrying secret papers from the New Zealand "Combined Intelligence Centre" in Wellington to the C-in-C, Eastern Fleet in Colombo.{{sfn|Elphick|1998|p=262}} This information, revealed that the Allies were reading some Japanese radio codes but its transfer to Japan was delayed until the beginning of July.{{sfn|Rahn|2001|p=430}}

On 14 June Thor's radar picked up a contact at 10,000 yards, and by using a converging course, was able to approach to within 1,800 yards, Thor attacked what turned out to be the 6,310-ton Dutch Shell tanker Olivia.{{sfn|Rohwer|Hümmelchen|2005|p=174}} The first salvo set Olivia ablaze, killing most of the crew. The third officer, three other Dutchmen and eight Chinese were able to lower one boat, but Thor was able to find only one man in the water. These 12 men were adrift for a month before their boat capsized in the breakers off Madagascar; one Dutch and seven Chinese mariners had died during the month at sea. Five days later on 19 June, Thor intercepted the Norwegian oil tanker Herborg. Her seaplane disabled Herborg{{'}}s radio aerial, and a warning salvo from Thor brought Herborg to a stop. The entire crew was taken aboard Thor, and a prize crew took the renamed Hohenfriedburg to Japan. On 4 July Thor stopped another Norwegian oil tanker, the 5,895-ton Madrono, in the same manner as Herborg. A prize crew took it to Japan as well, renamed as Rossbach.{{sfn|Rohwer|Hümmelchen|2005|p=174}}{{efn|Rossbach was torpedoed by the American submarine {{USS|Burrfish|SS-312|6}}, at 33°14′N, 134°40′E in the Kii Channel, Japan, in May 1944.{{sfn|Jordan|2006|p=562}}}}

On 20 July, the British Reefer ship Indus was attacked, that turned away from Thor at full speed, firing its stern gun. After two shots a shell from Thor hit the gun, killing the chief gunner and destroying the gun.{{sfn|Rohwer|Hümmelchen|2005|p=181}} The freighter's radio operator kept up a steady stream of distress signals, until another shell from Thor hit the bridge, killing him, knocking out the radio and setting the bridge on fire. Most of the crew went overboard and Thor ceased fire, rescuing 49 survivors before sinking Indus. Thor transferred its prisoners to the blockade runner Tannenfels, and made for Yokohama, Japan, via Batavia in the Japanese-occupied Dutch East Indies. Thor sank or took as prize ten ships on its second cruise, a total of 58,644 tons, during 328 days at sea and 22 ships for both voyages.{{sfn|Jackson|2000|pp=77, 71}}

{{main|Port of Yokohama}}

File:Japan Map CIA 2021.png}}]]

Thor reached Yokohama on 9 October 1942 and began refitting. On 30 November, explosions on the tanker {{ship|German tanker|Uckermark||2}} destroyed its superstructure, sending burning debris onto Thor, which was moored alongside. Both ships were rapidly set ablaze, along with Nankin/Leuthen and the Japanese freighter Unkai Maru. All four ships were destroyed in the fire and thirteen Thor crewmembers were killed, 53 from Uckermarck were killed along with Chinese and Japanese dockworkers; Thor was wrecked beyond repair and abandoned. Gumprich, with a composite crew of survivors from Thor and the crew of the commerce raider {{ship|German auxiliary cruiser|Michel||2}} on its second raiding voyage.{{sfn|Duffy|2001|pp=180, 103}}

Three ships were sunk before Michel was sunk by the submarine {{USS|Tarpon|SS-175|6}}.{{sfnm|1a1=Jordan|1y=2006|1p=477|2a1=Rohwer|2a2=Hümmelchen|2y=2005|2p=216|3a1=Duffy|3y=2001|3pp=180, 103}} Some survivors of the ship were sent to France on the blockade runner {{ship|German ship|Doggerbank||2}} and killed when the ship was mistakenly sunk by {{GS|U-43|1939|2}} on 3 March 1943, {{cvt|1000|nmi}} west of the Canary Islands, with all but one of the 365 crew lost.{{sfn|Woodman|2005|p=469}} Fritz Kürt was rescued by {{MV|Campoamor}}, a Spanish tanker. Kürt was the last man of fifteen who had survived the sinking of Doggerbank and got on board a Japanese liferaft.{{sfn|Brice|1981|p=119}} On its last voyage, Thor sank or made prizes of ten ships of 56,037 GRT.{{sfn|Rohwer|Hümmelchen|2005|p=216}}

In eleven long voyages from April 1940 to October 1943, nine auxiliary cruisers sank or took as prizes, 138 ships of 857,533 GRT. Twenty-three of the prizes of 128,550 GRT reached Axis ports in France or Japan. The light cruiser {{HMAS|Sydney|D48|6}} was sunk and many merchant ships had been damaged by mines. The great success (650,000 GRT) achieved until the end of 1941, surprised the SKL and was almost double that of warships in the Atlantic. The weakness of the Kriegsmarine meant that auxiliary cruisers were an efficient alternative but after their success in the First World War, greater use could have been made of them.{{sfn|Rahn|2001|p=431}}

{{notelist}}

{{Reflist|20em}}

{{refbegin}}

• {{cite book |last=Beesly |first=Patrick |title=Very Special Intelligence: The Story of the Admiralty's Operational Intelligence Centre 1939–1945 |year=2015 |orig-year=1977 |publisher=Hamish Hamilton |location=London |edition=Frontline Books (Pen & Sword) Barnsley |isbn=978-1-78-438156-1}}
• {{cite book |last1=Boog |first1=H. |last2=Rahn |first2=W. |last3=Stumpf |first3=R. |last4=Wegner |first4=B. |translator1-last=Osers |translator1-first=E. |translator2-last=Brownjohn |translator2-first=J. |translator3-last=Crampton |translator3-first=P. |translator4-last=Willmot |translator4-first=L. |series=Germany in the Second World War |title=The Global War: Widening of the Conflict into a World War and the Shift of the Initiative 1941–1943 |year=2001 |volume=VI |publisher=Militärgeschichtliches Forschungsamt (Research Institute for Military History) |location=Potsdam |edition=Eng trans. Oxford University Press, London |isbn=0-19-822888-0}}
• {{harvc |last=Rahn |first=W. |c=Part III The War at Sea in the Atlantic and in the Arctic Ocean. iii. The Conduct of the War in the Atlantic and the Coastal Area 2. Operations by Surface Forces (d) The Trade War with Auxiliary Cruisers |year=2001 |in1=Boog |in2=Rahn |in3=Stumpf |in4=Wegner}}
• {{cite book |last=Brice |first=Martin |title=Axis Blockade Runners of World War II |year=1981 |publisher=B. T. Batsford |location=London |isbn=0-7134-2686-1}}
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• {{cite book |last=Budiansky |first=S. |title=Battle of Wits: The Complete Story of Codebreaking in World War II |year=2000 |publisher=The Free Press (Simon & Schuster) |location=New York |isbn=0-684-85932-7 |url-access=registration |url=https://archive.org/details/battleofwitscomp00budi |via=Archive Foundation}}
• {{cite book |last=Duffy |first=James P. |title=Hitler's secret Pirate Fleet: The Deadliest ships of World War II |year=2001 |publisher=Praeger |location=Westport, CN |edition=1st |isbn=0-275-96685-2}}
• {{cite book |last=Elphick |first=Peter |title=Far Eastern File: The Intelligence War in the Far East 1930–1945 |orig-year=1997 |year=1998 |publisher=Hodder & Stoughton |location=London |isbn=0-340-66584-X}}
• {{cite book |last=Hampshire |first=A. Cecil |year=1980 |title=The Blockaders |location=London |publisher=William Kimber |isbn=0-7183-0227-3}}
• {{cite book |last1=Jackson |first1=Robert |title=Kriegsmarine: the Illustrated History of the German Navy in World War II |year=2000 |publisher=MBI Publishing |location= |isbn=978-0-76-031026-7}}
• {{cite book |last=Jordan |first=Roger W. |title=The World's Merchant Fleets 1939: The Particulars and Wartime Fates of 6,000 Ships |year=2006 |orig-year=1999 |publisher=Chatham/Lionel Leventhal |location=London |edition=2nd |isbn=978-1-86176-293-1}}
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• {{cite book |last1=Maier |first1=Klaus A. |last2=Rohde |first2=Horst |last3=Stegemann |first3=Bernd |last4=Umbreit |first4=Hans |title=Germany and the Second World War: Germany's Initial Conquests in Europe |year=2015 |orig-year=1991 |publisher=Militärgeschichtliches Forschungsamt [Research Institute for Military History] |editor-last=Falla |editor-first=P. S. |edition=trans. pbk. Clarendon Press, Oxford |volume=II |location=Freiburg im Breisgau |language=en |translator-last=McMurry |translator-first=Dean S. |translator-last2=Osers |translator-first2=Ewald |isbn=978-0-19-873834-3}}
• {{harvc |last=Stegemann |first=Bernd |c=Part VIII The Second Phase of the War at Sea (until the Spring of 1941) |year=2015 |in1=Maier |in2=Rohde |in3=Stegemann |in4=Umbreit}}
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• {{cite book |last=Woodman |first=Richard |title=The Real Cruel Sea: The Merchant Navy in the Battle of the Atlantic 1939–1943 |year=2005 |orig-year=2004 |publisher=John Murray |location=London |isbn=0-7195-6599-5}}

{{refend}}

• [https://www.youtube.com/watch?v=Fplml2C2n5M&NR=1 German newsreel Hilfskreuzer Thor] {{in lang|de}}

{{German auxiliary cruiser}}

{{November 1942 shipwrecks}}

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