UB-43 in port, c. 1915–16
UB-43 in port, c. 1915–16
History
German Empire
NameUB-43
Ordered31 July 1915[1]
BuilderAG Weser, Bremen[1]
Yard number245[1]
Laid down3 September 1915[1]
Launched8 April 1916[1]
Commissioned24 April 1916[1]
Decommissioned21 July 1917[1]
FateSold to Austria-Hungary
Service record as UB-43
Part of:
Commanders:
  • Oblt. Dietrich Niebuhr
  • 24 April – 28 August 1916 [1]
  • Kptlt. Hans von Mellenthin
  • 29 August 1916 – 8 April 1917
  • Oblt. Horst Obermüller
  • 9 April – 15 July 1917
Operations: 10 patrols
Victories:
  • 22 merchant ships sunk
    (99,176 GRT)[1]
  • 1 warship damaged
    (7,350 tons)
Austria-Hungary
NameSM U-43
Acquired21 July 1917
Commissioned30 July 1917
FateCeded to France as war reparation, 1920; scrapped
Service record as U-43
Commanders:
  • Friedrich Schlosser
  • 30 July 1917 – 13 January 1918[2]
  • Eugen Hornyák Edler von Horn
  • 7 February – 31 October 1918
Victories: 1 merchant ship damaged
(4,016 GRT)[2]
General characteristics [3]
Class and type
Displacement
  • 272 t (268 long tons) surfaced
  • 205 t (202 long tons) submerged
Length
Beam
  • 4.37 m (14 ft 4 in) o/a
  • 3.85 m (12 ft 8 in) pressure hull
Draught3.69 m (12 ft 1 in)
Propulsion
Speed
  • 8.82 knots (16.33 km/h; 10.15 mph) surfaced
  • 6.22 knots (11.52 km/h; 7.16 mph) submerged
Range
  • 6,940 nmi (12,850 km; 7,990 mi) at 5 knots (9.3 km/h; 5.8 mph) surfaced
  • 45 nmi (83 km; 52 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Complement23
Armament

SM UB-43 was a Type UB II submarine or U-boat for the German Imperial Navy (German: Kaiserliche Marine) during World War I. UB-43 was sold to the Austro-Hungarian Navy (German: Kaiserliche und Königliche Kriegsmarine or K.u.K. Kriegsmarine) during the war. In Austro-Hungarian service the B was dropped from her name and she was known as SM U-43 or U-XLIII as the lead boat of the Austro-Hungarian U-43 class.

UB-43 was ordered in July 1915 and was laid down at the AG Weser shipyard in Bremen in September. UB-43 was a little more than 121 feet (37 m) in length and displaced between 270 and 305 tonnes (266 and 300 long tons), depending on whether surfaced or submerged. She was equipped to carry a complement of four torpedoes for her two bow torpedo tubes and had an 8.8-centimeter (3.5 in) deck gun. As part of a group of six submarines selected for Mediterranean service, UB-43 was broken into railcar sized components and shipped to Pola where she was assembled and launched in early April 1916, and commissioned later in the month. Over the next year the U-boat sank twenty-two ships, which included the Peninsular and Oriental liner Arabia. UB-43 also damaged the British protected cruiser HMS Grafton.

The German Imperial Navy was having difficulties filling submarine crews with trained men and offered to sell UB-43 and a sister boat, UB-47, to the Austro-Hungarian Navy. After the terms were agreed to in June 1917, both boats were handed over at Pola. When commissioned into the Austro-Hungarian Navy, the B in her designation was dropped so that she became U-43 or U-XLIII. She damaged one Italian steamer in limited Austro-Hungarian service through the end of the war. U-43 was ceded to France as a war reparation in 1920 and broken at Bizerta that same year.

Design and construction

The German UB II design improved upon the design of the UB I boats, which had been ordered in September 1914.[4] In service, the UB I boats were found to be too small and too slow. A major problem was that, because they had a single propeller shaft/engine combo, if either component failed, the U-boat became almost totally disabled.[5] To rectify this flaw, the UB II boats featured twin propeller shafts and twin engines (one shaft for each engine), which also increased the U-boat's top speed.[6] The new design also included more powerful batteries,[5] larger torpedo tubes, and a deck gun.[7] As a UB II boat, U-43 could also carry twice the torpedo load of her UB I counterparts, and nearly ten times as much fuel.[7] To accommodate all of these changes the boats' had larger hulls,[5] and surface and submerged displacements more than twice those of the UB I boats.[7]

The Imperial German Navy ordered UB-43 from AG Weser on 31 July 1915 as one of a series of six UB II boats (numbered from UB-42 to UB-47) UB-43 was 36.90 metres (121 ft 1 in) long and 4.37 metres (14 ft 4 in) abeam. She had a single hull with saddle tanks and had a draft of 3.68 metres (12 ft 1 in) when surfaced. She displaced 305 tonnes (300 long tons) while submerged but only 272 tonnes (268 long tons) on the surface.[3]

The submarine was equipped with twin Daimler diesel engines and twin Siemens-Schuckert electric motors—for surfaced and submerged running, respectively—that drove one propeller shaft. UB-43 had a surface speed of up to 8.82 knots (16.33 km/h; 10.15 mph) and could go as fast as 6.22 knots (11.52 km/h; 7.16 mph) while underwater. The U-boat could carry up to 27 tonnes (27 long tons) of diesel fuel, giving her a range of 6,940 nautical miles (12,850 km; 7,990 mi) at 5 knots (9.3 km/h; 5.8 mph) Her electric motors and batteries provided a range of 45 nautical miles (83 km; 52 mi) at 4 knots (7.4 km/h; 4.6 mph) while submerged.[3]

UB-43 was equipped with two 50-centimeter (19.7 in) bow torpedo tubes and could carry four torpedoes. The U-boat was also armed with one 8.8 cm (3.5 in) Uk L/30 deck gun.[3]

UB-43 was laid down by AG Weser at its Bremen shipyard on 3 September 1915.[1] As one of six U-boats selected for service in the Mediterranean while under construction, UB-43 was broken into railcar-sized components and shipped overland to the Austro-Hungarian port of Pola.[8][9] Shipyard workers from Weser assembled the boat and her five sisters at Pola,[8] where she was launched on 8 April.[1]

German Imperial Navy career

SM UB-43 was commissioned into the German Imperial Navy on 24 April 1916 under the command of Oberleutnant zur See Dietrich Niebuhr;[1][Note 1] UB-43 was the only U-boat command for the 27-year-old officer.[10] UB-43 was assigned to the Navy's Pola Flotilla (German: Deutsche U-Halbflotille Pola) in which she remained throughout her German career.[1] Although the flotilla was based in Pola, the site of the main Austro-Hungarian Navy base, boats of the flotilla operated out of the Austro-Hungarian base at Cattaro which was located farther south and closer to the Mediterranean. German U-boats typically returned to Pola only for repairs.[11]

Under Niebuhr's command, UB-43 had no success,[10] and he was replaced by Kapitänleutnant Hans-Joachim von Mellenthin on 29 August.[1] After two weeks under von Mellenthin's command, UB-43 sank her first ship. While 112 nautical miles (207 km; 129 mi) east of Malta, the British steamer Italiana with her cargo of hay destined for Salonica was torpedoed and sunk.[12] Three days later, and some 60 nautical miles (110 km; 69 mi) closer to Malta, von Mellenthin sank a pair of British steamers. Dewa was in ballast headed for Port Said when attacked by UB-43; three of the steamer's crew lost their lives in the attack.[13] Lord Tredegar was carrying a general cargo when she was sent down with the loss of four men.[14] The Wall Street Journal reported that the sinking of Lord Tredegar resulted in a loss of $1,000,000 for her American insurer.[15]

In October, von Mellenthin and UB-43 sank an additional two ships.[16] On 10 October, the British tanker Elax, carrying fuel oil from Rangoon was sunk off Cape Matapan without casualties.[17] Three days later, two men were killed when UB-43 torpedoed and sank their ship, the British steamer Welsh Prince, of 4,934 gross register tons (GRT).[18]

On 18 November, the British Admiralty, released a report that listed all of UB-43's first five victims as evidence of German wrongdoing. According to the British report, Italiana, Dewa, Lord Tredegar, and Elax—four of the twenty-two ships listed—had all been torpedoed without warning. This type of attack was counter to German pledges to adhere cruiser warfare, which required that ships be allowed time for the crews to escape before any attack could commence.[19] UB-43's fifth victim, Welsh Prince, was on another list of 107 British ships sunk whose lifeboats had been fired upon by German submarines.[19]

In the meantime, UB-43 had continued sinking British ships, sending down five in a nine-day span in early November.[16] Statesman, a 6,153 GRT steamer carrying a general cargo, was first on 3 November; six crewmen were killed when the ship went down 200 nautical miles (370 km; 230 mi) east of Malta.[20] The following day, the 3,937 GRT Clan Leslie and the 5,398 GRT Huntsvale were sunk in the same area.[21][22] Clan Leslie was carrying a general cargo from Bombay when sunk with three casualties.[21] Seven were killed when Huntsvale, traveling in ballast for Algiers, was sunk.[22]

RMS Arabia, a Peninsular and Oriental liner, was sunk by UB-43 on 6 November 1916.

On 6 November, UB-43 torpedoed the Peninsular and Oriental liner Arabia 112 nautical miles (207 km; 129 mi) off Cape Matapan.[23] According to contemporary news accounts, gunners on Arabia fired upon UB-43 after the liner was torpedoed, but recorded no hits.[24] All 437 passengers aboard the steamer,[25] en route from Sydney to London when attacked,[23] were rescued after an hour in the water. The liner went down 90 minutes after the torpedo struck. Eleven died in the attack,[26] including two of Arabia's engineers killed in the initial blast of the torpedo.[24] Six days after Arabia's sinking, UB-43 sank the 3,383 GRT British steamer Kapunda east of Malta.[27] Kapunda's loss brought the U-boat's November tally to 26,774 gross register tons,[16] which accounted for more than 15% of the November tally for all German U-boats in the Mediterranean.[28]

UB-43 and von Mellenthin sank three more British steamers in December: Bretwalda on the 13th, and Russian and Westminster on the 14th.[16] Bretwalda—which had escaped destruction from a mine laid by UC-5 in August 1915—and her cargo of jute were sent down 220 nautical miles (410 km; 250 mi) from Malta.[29] Russian, at 8,825 GRT, was the largest ship sunk by UB-43;[16] the horse transport ship was sailing in ballast from Salonica when she went down with 28 of her crewmen.[30][31] After UB-43 torpedoed Westminster,[16] the U-boat shelled the survivors in their lifeboats, according to authors R. H. Gibson and Maurice Prendergast.[30] Fifteen men from Westminster died in the sinking.[32]

UB-43 sank no ships over the next eight weeks.[16] Author Paul Halpern reports that the majority of the German U-boats in the Mediterranean fleet were undergoing repairs and refits at Pola and Cattaro during January. Although no specific mention is made of repairs done on UB-43, the U-boat's inactivity in this period may be for that reason.[33]

Unrestricted submarine warfare

On 1 February 1917, Kaiser Wilhelm II personally approved a resumption of unrestricted submarine warfare in order to try to force the British to make peace.[34] The new rules of engagement specified that no ship was to be left afloat,[35][Note 2] although British reports for several of UB-43's victims suggest that von Mellenthin was already operating in this manner.[25]

Under these new rules of engagement, UB-43 first sank the Greek steamer Miaoulis 130 nautical miles (240 km; 150 mi) from Benghazi on 24 February, while she was carrying cottonseed to London.[36][37] Two days later, the turret hull steamer Clan Farquhar,[38] carrying cotton and coal for London,[37] was torpedoed and sunk. After the attack, which killed 49 of her crew, the ship's second engineer was taken captive by von Mellenthin.[38] On the 27th, Brodmore and her cargo of frozen meat from Majunga were sunk off Libya (and her master taken prisoner),[39] and on the 28th the Japanese steamer Shinsei Maru was sunk nearby.[40]

HMS Grafton, a British protected cruiser, was damaged when torpedoed by UB-43 in June 1917.

She was nearly a month later before von Mellenthin and UB-43 sank their next target. On 26 March, the British steamer Ledbury, carrying wheat from Karachi, was sunk 90 nautical miles (170 km; 100 mi) from Benghazi.[41] Eight days later, Vasilefs Constantinos, a Greek steamer of 4,070 gross register tons (GRT), was sunk in the Ionian Sea; the Constantinos was the last ship sunk by UB-43 under von Mellenthin's command.[42] On 9 April, von Mellenthin was succeeded by Oblt.z.S. Horst Obermüller,[1] a 26-year-old first time U-boat commander.[43] Under von Mellenthin's command, UB-43 had sunk 86,236 gross register tons (GRT) of merchant shipping.[Note 3]

On 1 May, Obermüller sank the American-owned (but British-flagged) tanker British Sun carrying a load of fuel oil.[44] According to a report in The New York Times, the 5,565 GRT vessel, valued at $2,500,000, was "one of the finest" tankers.[44][45] The collier Repton was sent down off Cape Matapan six days later; three of the British steamer's crewmen died in the attack.[46] Later in the month, the Greek steamer Dorothy and her cargo of wheat from Karachi were sunk 45 nautical miles (83 km; 52 mi) from Cap D'Armi.[47] UB-43's final attack of note was upon the protected cruiser HMS Grafton, torpedoed 150 nautical miles (280 km; 170 mi) east of Malta. Grafton was damaged but suffered no casualties.[48] The 7,350-tonne (7,230-long-ton)-displacement British ship was brought safely into port at Malta.[49]

On 21 July, UB-43 was decommissioned at Pola and handed over to the Austro-Hungarian Navy. In her German Imperial Navy career of fourteen months, UB-43 sank twenty-two merchant ships totaling 99,176 gross register tons (GRT), and damaged one warship with a displacement of 7,350 tonnes (7,230 long tons).[1][Note 4]

Austro-Hungarian Navy service

In November 1916, the German Imperial Navy, having a hard time finding trained submarine crews, inquired to find out if its ally Austria-Hungary was interested in purchasing some of its Mediterranean submarines. A general agreement led to protracted negotiations, which stalled over the outflow of Austro-Hungarian gold reserves to Germany. But, with all of the details worked out, the two parties agreed on the sale of UB-43 and sister ship UB-47 to Austria-Hungary in June 1917.[50][Note 5]

When handed over by the Germans on 21 July, UB-43 was in a "worn out condition". Despite the rough condition of the boat, the U-boat was commissioned into the Austro-Hungarian Navy on 30 July 1917 as SM U-43, dropping the B from her former designation. Linienschiffsleutnant Friedrich Schlosser was installed as the new commander of the U-boat,[2] which remained at Pola for the next three months undergoing repairs. Departing that port on 1 November, U-43 made way to Cattaro, and then went out on patrol.[51] Schlosser torpedoed the Italian steamer Orione on 16 November, but the Italian ship did not sink; she was towed to safety in Taranto.[52]

On 30 November, a leak on U-43 partially flooded the boat and caused her to sink to a depth of 100 metres (330 ft) before she was brought under control and raised to the surface. The flooding damaged the U-boat's electrical systems, preventing her from submerging on her return to port for repairs. An unidentified submarine launched a torpedo at the surfaced U-43, but the torpedo's aim was off and it passed harmlessly in front of the bow. The boat made port at Cattaro on 1 December and at Pola on 6 December for two months of repairs.[51]

During U-43's time under repair, Schlosser was reassigned to command U-14,[53] and Linienschiffsleutnant Eugen Hornyák Edler von Horn was named to take his place aboard U-43 on 18 January 1918.[2][54] Under von Horn, U-43 patrolled off Cattaro, having to crash dive at least once to escape attack from enemy torpedo boats. On 17 March, while returning to Cattaro from patrol, the crew of the Austro-Hungarian destroyer Dinara mistook U-43 for an enemy submarine and rammed her, damaging the diving planes. U-43 sailed for Fiume for three months of repairs.[51]

The U-boat returned to action in June and patrolled off Montenegro, Durazzo, and Cattaro for the next five months. On 13 June, U-43 was slightly damaged in an air raid on Cattaro and, on 5 September, had to crash dive to avoid another air attack while off Cattaro. On 20 September, the boat rendezvoused with U-47 and received a French prisoner of war. The prisoner was the only survivor of the French submarine Circé, which U-47 had torpedoed the night before.[51]

At the end of the war, U-43 was at Cattaro.[55] In her Austro-Hungarian Navy career, U-43 damaged a single merchant ship of 4,016 gross register tons.[2] U-43 was ceded to France as a war reparation in 1920, towed to Bizerta, and broken up there within a year.[55]

Summary of raiding history

As the German UB-43

Ships sunk or damaged by SM UB-43[16]
Date Name Nationality Tonnage[Note 6] Fate
14 September 1916 Italiana  United Kingdom 2,663 Sunk
17 September 1916 Dewa  United Kingdom 3,802 Sunk
17 September 1916 Lord Tredegar  United Kingdom 3,856 Sunk
10 October 1916 Elax  United Kingdom 3,980 Sunk
13 October 1916 Welsh Prince  United Kingdom 4,934 Sunk
3 November 1916 Statesman  United Kingdom 6,153 Sunk
4 November 1916 Clan Leslie  United Kingdom 3,937 Sunk
4 November 1916 Huntsvale  United Kingdom 5,398 Sunk
6 November 1916 Arabia  United Kingdom 7,903 Sunk
12 November 1916 Kapunda  United Kingdom 3,383 Sunk
13 December 1916 Bretwalda  United Kingdom 4,037 Sunk
14 December 1916 Russian  United Kingdom 8,825 Sunk
14 December 1916 Westminster  United Kingdom 4,342 Sunk
24 February 1917 Miaoulis  Greece 2,918 Sunk
26 February 1917 Clan Farquhar  United Kingdom 5,858 Sunk
27 February 1917 Brodmore  United Kingdom 4,071 Sunk
28 February 1917 Shinsei Maru  Japan 3,060 Sunk
26 March 1917 Ledbury  United Kingdom 3,046 Sunk
3 April 1917 Vasilefs Constantinos  Greece 4,070 Sunk
1 May 1917 British Sun  United Kingdom 5,565 Sunk
7 May 1917 Repton  United Kingdom 2,881 Sunk
26 May 1917 Dorothy  Greece 4,494 Sunk
11 June 1917 HMS Grafton  Royal Navy 7,350 Damaged
Sunk:
Damaged:
Total:		 99,176
7,350
106,526

As the Austro-Hungarian U-43

Ships sunk or damaged by SM U-43[56]
Date Name Nationality [Note 6]Tonnage Fate
16 November 1917 Orione  Kingdom of Italy 4,016 Damaged
Damaged: 4,016

Notes

  1. ↑ Oberleutnant zur See Niebuhr was in the Navy's April 1907 cadet class with 34 other future U-boat captains, including Werner Fürbringer, Heino von Heimburg, Hans Howaldt, Otto Steinbrinck, and Ralph Wenninger. See: Helgason, Guðmundur. "WWI Officer Crews: Crew 4/07". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 11 February 2009.
  2. ↑ Since the early stages of the war, the British had blockaded Germany, preventing neutral shipping from reaching German ports. By the time of the so-called "turnip winter" of 1916–17, the blockade had severely limited imports of food and fuel into Germany. Among the results were an increase in infant mortality and as many as 700,000 deaths attributed to starvation or hypothermia during the war. See: Tarrant, pp. 44–45.
  3. ↑ Von Mellenthin went on to command UB-49 (one of the earliest of the UB III U-boats) and, later, U-120, and was awarded the Pour le Mérite in February 1918. See: Helgason, Guðmundur. "Ships hit during WWI: Hans von Mellenthin". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  4. ↑ Oberleutnant zur See Obermüller, UB-43's commander at the time she was decommissioned, went on to command the coastal minelayer UC-34 and, later, UB-132. See: Helgason, Guðmundur. "WWI U-boat commanders: Horst Obermüller". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  5. ↑ UB-43 and UB-47 were not the first former Imperial German Navy submarines purchased by the Austro-Hungarian Navy. In 1915 the Austro-Hungarian Navy purchased the German U-boats UB-1 and UB-15 and commissioned them as U-10 and U-11, respectively. See: Gardiner, p. 343.
  6. 1 2 Merchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Helgason, Guðmundur. "WWI U-boats: UB 43". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  2. 1 2 3 4 5 Helgason, Guðmundur. "WWI U-boats: KUK U43". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  3. 1 2 3 4 Gröner 1991, pp. 23–25.
  4. ↑ Gardiner, p. 174.
  5. 1 2 3 Miller, p. 48.
  6. ↑ Williamson, p. 13.
  7. 1 2 3 Tarrant, p. 172.
  8. 1 2 Halpern, p. 383.
  9. ↑ Miller, p. 49.
  10. 1 2 Helgason, Guðmundur. "WWI U-boat commanders: Dietrich Niebuhr". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  11. ↑ Halpern, p. 384.
  12. ↑ Helgason, Guðmundur. "Ships hit during WWI: Italiana". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  13. ↑ Helgason, Guðmundur. "Ships hit during WWI: Dewa". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  14. ↑ Helgason, Guðmundur. "Ships hit during WWI: Lord Tredegar". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  15. ↑ "War risk insurance". The Wall Street Journal. 21 September 1916. p. 7.
  16. 1 2 3 4 5 6 7 8 Helgason, Guðmundur. "Ships hit by UB 43". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  17. ↑ Helgason, Guðmundur. "Ships hit during WWI: Elax". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  18. ↑ Helgason, Guðmundur. "Ships hit during WWI: Welsh Prince". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  19. 1 2 "Lists 22 violations of German pledge". The New York Times. 19 November 1916. p. 3.
  20. ↑ Helgason, Guðmundur. "Ships hit during WWI: Statesman". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  21. 1 2 Helgason, Guðmundur. "Ships hit during WWI: Clan Leslie". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  22. 1 2 Helgason, Guðmundur. "Ships hit during WWI: Huntsvale". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  23. 1 2 Helgason, Guðmundur. "Ships hit during WWI: Arabia". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  24. 1 2 "Steamer Arabia fires on diver". San Francisco Chronicle. 11 November 1916. p. 4.
  25. 1 2 "Arabia torpedoed without warning". The New York Times. 9 November 1916. p. 8.
  26. ↑ "Arabia (1105587)". Miramar Ship Index. Retrieved 12 February 2009.
  27. ↑ Helgason, Guðmundur. "Ships hit during WWI: Kapunda". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  28. ↑ The merchant vessel tonnage sunk by German U-boats in the Mediterranean in November 1916 was 166,130 tons. See: Tarrant, p. 148.
  29. ↑ Helgason, Guðmundur. "Ships hit during WWI: Bretwalda". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  30. 1 2 Gibson and Prendergast, p. 134.
  31. ↑ Helgason, Guðmundur. "Ships hit during WWI: Russian". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  32. ↑ Helgason, Guðmundur. "Ships hit during WWI: Westminster". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  33. ↑ Halpern, p. 390.
  34. ↑ Tarrant, pp. 45–46.
  35. ↑ Tarrant, p. 46.
  36. ↑ Helgason, Guðmundur. "Ships hit during WWI: Miaoulis". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  37. 1 2 "Berlin reports 15 ships sunk in Mediterranean". Chicago Daily Tribune. 9 March 1917. p. 2.
  38. 1 2 Helgason, Guðmundur. "Ships hit during WWI: Clan Farquhar". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  39. ↑ Helgason, Guðmundur. "Ships hit during WWI: Brodmore". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  40. ↑ Helgason, Guðmundur. "Ships hit during WWI: Shinsei Maru". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  41. ↑ Helgason, Guðmundur. "Ships hit during WWI: Ledbury". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  42. ↑ Helgason, Guðmundur. "Ships hit during WWI: Vasilefs Constantinos". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  43. ↑ Helgason, Guðmundur. "Ships hit during WWI: Horst Obermüller". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  44. 1 2 Helgason, Guðmundur. "Ships hit during WWI: British Sun". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  45. ↑ "8,600-ton steamer is sunk". The New York Times. 4 May 1917. p. 4. According to the article, British Sun was 8,600 tons, but Uboat.net and the Miramar Ship Index both list the vessel as 5,565 gross register tons. See: "British Sun (1127990)". Miramar Ship Index. Retrieved 12 February 2009.
  46. ↑ Helgason, Guðmundur. "Ships hit during WWI: Repton". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  47. ↑ Helgason, Guðmundur. "Ships hit during WWI: Dorothy". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  48. ↑ Helgason, Guðmundur. "Ships hit during WWI: Grafton (hms)". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  49. ↑ Gibson and Prendergast, p. 260.
  50. ↑ Baumgartner and Sieche, as excerpted here (reprinted and translated into English by Sieche). Retrieved 9 February 2009.
  51. 1 2 3 4 "Tengeralattjárók" (PDF) (in Hungarian). Imperial and Royal Navy Association. pp. 30–31. Archived from the original (PDF) on 11 October 2021. Retrieved 12 February 2009.
  52. ↑ Helgason, Guðmundur. "Ships hit during WWI: Orione". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  53. ↑ Helgason, Guðmundur. "WWI U-boat commanders: Friedrich Schlosser". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  54. ↑ Helgason, Guðmundur. "WWI U-boat commanders: Eugen Hornyák Edler von Horn". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.
  55. 1 2 Gibson and Prendergast, p. 389.
  56. ↑ Helgason, Guðmundur. "Ships hit by KUK U43". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 12 February 2009.

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