:SM U-4 (Austria-Hungary)

{{Short description|Austro-Hungarian Navy's U-3-class submarine}}

{{Infobox ship image

|Ship image=U-4 in Pola.png

|Ship caption=U-4 in Pola in 1913

}}

{{Infobox ship career

|Ship country=Austria-Hungary

|Ship flag={{Shipboxflag|Austria-Hungary|naval}}

|Ship name=SM U-4

|Ship ordered=1906Gibson and Prendergast, p. 384.

|Ship laid down=12 March 1907Sieche, p. 19.

|Ship builder=Friedrich Krupp Germaniawerft, KielGardiner, pp. 342–43.

|Ship yard number=136Baumgartner and Sieche, as excerpted [http://www.gwpda.org/naval/ahsubs.htm here] (reprinted and translated into English by Sieche). Retrieved 14 November 2008.

|Ship launched=20 November 1908

|Ship commissioned=29 August 1909

|Ship fate=Ceded to France as war reparation and scrapped, 1920

}}

{{Infobox service record

|is_ship=yes

|is_multi=yes

|commanders=

Lothar Leschanowsky
29 August – 17 September 1910
29 April – 21 September 1911{{cite Uboat.net

|name=KUK U4

|id=KUK+U4

|type=1sub

|access-date=14 November 2008

}}

Rudolf Singule
21 September 1912 – 7 July 1913
Hermann Jüstel
7 July 1913 – 2 April 1915
Edgar Wolf
2 – 9 April 1915
Rudolf Singule
9 April 1915 – 30 November 1917
Franz Rzemenowsky von Trautenegg
30 November 1917 – 1 July 1918

|operations=

|victories=

8 merchant ships sunk
({{GRT|12,673}})
4 warships sunk
(7,345 tons)
3 auxiliary warships sunk
({{GRT|2,255}})
1 merchant ship damaged
({{GRT|3,498}})
2 warships damaged
(5,437 tons)
3 merchant ships taken as prize
({{GRT|16}} + Unknown GRT)

}}

{{Infobox ship characteristics

|Ship class=U-3-class submarine

|Ship displacement=*240 t surfaced

300 t submergedSieche, p. 17.

|Ship length={{convert|138|ft|9|in|m|abbr=on}}

|Ship beam={{convert|14|ft|m|1|abbr=on}}

|Ship draft={{convert|12|ft|6|in|m|abbr=on}}

|Ship propulsion=*2 × shafts

2 × kerosene 4-cylinder two-stroke engines, {{convert|600|bhp|abbr=on}} total
2 × electric motors, {{convert|320|shp|abbr=on}} total

|Ship speed=*{{convert|12|kn|km/h}} surfaced

{{convert|8.5|kn|km/h}} submerged

|Ship range=*{{convert|1200|nmi|km|abbr=on}} at {{convert|12|kn|km/h}}, surfaced

{{convert|40|nmi|km|abbr=on}} at {{convert|3|kn|km/h}}, submerged

|Ship test depth=

|Ship complement=21

|Ship armament=*2 × {{convert|45|cm|in|1|abbr=on}} torpedo tubes (both front)

3 torpedoes

|Ship notes=

}}

SM U-4 or U-IV was a U-3-class submarine or U-boat built for and operated by the Austro-Hungarian Navy ({{langx|de|Kaiserliche und Königliche Kriegsmarine}} or {{lang|de|K.u.K. Kriegsmarine}}) before and during the First World War. The submarine was built as part of a plan to evaluate foreign submarine designs, and was the second of two boats of the class built by Germaniawerft of Kiel, Germany.

U-4 was authorized in 1906, begun in March 1907, launched in November 1908, and towed from Kiel to Pola in April 1909. The double-hulled submarine was just under {{convert|139|ft|m}} long and displaced between {{convert|240|and|300|t|ST}}, depending on whether surfaced or submerged. The design of the submarine had poor diving qualities and several modifications to U-4{{'}}s diving planes and fins occurred in her first years in the Austro-Hungarian Navy. Her armament, as built, consisted of two bow torpedo tubes with a supply of three torpedoes, but was supplemented with a deck gun, the first of which was added in 1915.

The boat was commissioned into the Austro-Hungarian Navy in August 1909, and served as a training boat—sometimes making as many as ten cruises a month—through the beginning of the First World War in 1914. At the start of that conflict, she was one of only four operational submarines in the Austro-Hungarian Navy U-boat fleet. Over the first year of the war, U-4 made several unsuccessful attacks on warships and captured several smaller vessels as prizes. In July 1915, she scored what Conway's All the World's Fighting Ships 1906–1921 calls her greatest success when she torpedoed and sank the Italian armored cruiser {{Ship|Italian cruiser|Giuseppe Garibaldi|1899|2}}, the largest ship hit by U-4 during the war.

In mid-May 1917, U-4 was a participant in a raid on the Otranto Barrage which precipitated the Battle of Otranto Straits. In a separate action that same month, U-4 sank her second largest ship, the Italian troopship Perseo. She scored her final success in July 1917 with the sinking of a French tug. In total, U-4 sank fifteen ships totaling {{GRT|14,928|disp=long}} and 7,345 tons. She survived the war as Austria-Hungary's longest serving submarine, was ceded to France as a war reparation, and scrapped in 1920.

Design and construction

U-4 was built as part of a plan by the Austro-Hungarian Navy to competitively evaluate foreign submarine designs from Simon Lake, Germaniawerft, and John Philip Holland.Gardiner, p. 340. The Austro-Hungarian Navy authorized the construction of U-4 (and sister ship, U-3) in 1906 by Germaniawerft of Kiel, Germany. U-4 was laid down on 12 March 1907 and launched on 20 November 1908.In their book The German Submarine War, 1914–1918, R. H. Gibson and Maurice Prendergast report that U-4 was launched in 1909 (p. 384). After completion, she was towed via Gibraltar to Pola, where she arrived on 19 April 1909.

U-4{{'}}s design was an improved version of Germaniawerft's design for the Imperial German Navy's first U-boat, {{SMU|U-1|Germany|2}}, and featured a double hull with internal saddle tanks. The Germaniawerft engineers refined the design's hull shape through extensive model trials.

U-4 was {{convert|138|ft|9|in|m|0}} long by {{convert|14|ft|m|1}} abeam and had a draft of {{convert|12|ft|6|in|m}}. She displaced {{convert|240|t|ST}} surfaced and {{convert|300|t|ST}} submerged. She was armed with two bow {{convert|45|cm|in|1|sp=us|adj=on}} torpedo tubes, and was designed to carry up to three torpedoes.

Early career

After U-4{{'}}s arrival at Pola in April 1909, she was commissioned into the Austro-Hungarian Navy on 29 August 1909 as SM U-4.Sieche, pp. 19–20. During the evaluation of the U-3 class conducted by the Navy, the class' poor diving and handling characteristics were noted. To alleviate the diving problems, U-4{{'}}s fins were changed in size and shape several times, and eventually, the front diving planes were removed and a stationary stern flap was affixed to the hull.These same remedies were applied to U-4{{'}}s sister ship {{SMU|U-3|Austria-Hungary|2}}. U-4 served as a training boat between 1910 and 1914 and made as many as ten cruises per month in that capacity.Sieche, p. 20.

World War I

= 1914–1916 =

At the beginning of World War I, she was one of only four operational submarines in the Austro-Hungarian Navy.Gardiner, p. 341. On 27 September 1914, U-4 began operating reconnaissance cruises out of the naval base at Cattaro under the command of Linienschiffsleutnant Hermann Jüstel. U-4 attacked the cruiser Waldeck-Rousseau on 17 October, but the French vessel escaped without serious damage.Gibson and Prendergast, p. 69. In late November, U-4 seized the {{GRT|13}} Albanian sailing vessel Fiore del Mar as a prize off Montenegro.{{cite Uboat.net

|name=Fiore del Mar

|id=2183

|type=1ship

|access-date=17 November 2008

}} U-4 received her first radio set the following month.

U-4{{'}}s next success was the capture of three Montenegrin boats on 19 February 1915. Rudolf Singule, who was to become U-4{{'}}s most successful commander,{{cite Uboat.net

|name=Ships hit by KUK U4

|id=KUK+U4

|type=1boat

|access-date=17 November 2008

}} assumed command of the boat in April 1915.It was Singule's second stint in command of U-4; he had also been the boat's commanding officer from September 1912 to July 1913. Around the same time, the boat was equipped with a {{convert|3.7|cm|in|sp=us|adj=on}} quick firing (QF) deck gun. On 24 May, in the Gulf of Drin, U-4 unsuccessfully attacked an Italian {{sclass|Lombardia|cruiser|1}}, but on 9 June, Singule spotted the British cruiser {{HMS|Dublin|1912|2}} escorting a convoy along the Montenegrin coast. Despite a screen of six destroyers, U-4 was able to torpedo Dublin off San Giovanni de Medua.Gibson and Prendergast, p. 70. Twelve men on Dublin died in the attack,{{cite Uboat.net

|name=Dublin

|id=1730

|type=1ship

|access-date=17 November 2008

}} but the cruiser made her way safely, albeit damaged, back to port.

On 18 July, U-4 chanced upon an Italian squadron of ships shelling the railroads at Dubrovnik. Singule selected the Italian armored cruiser {{Ship|Italian cruiser|Giuseppe Garibaldi|1899|2}} as a target and torpedoed her.Gibson and Prendergast, p. 73.{{csr|register=MSI|id=6100900|shipname=Giuseppe Garibaldi |access–date=17 November 2008}} Giuseppe Garibaldi—at 7,234 tons, the largest ship sunk by U-4—sank with a loss of 53 men; 525 men survived. Conway's All the World's Fighting Ships 1906–1921 calls the sinking of Giuseppe Garibaldi as U-4{{'}}s greatest success. In August, she was sent out to search for her missing sister ship, {{SMU|U-3|Austria-Hungary|2}}, which was overdue, having been sunk on 13 August by the French destroyer Bisson. In November, U-4 made an unsuccessful attack on a British {{sclass|Topaze|cruiser|1}}. In early December, U-4 dispatched two small Albanian vessels in the Gulf of Drin.{{cite Uboat.net

|name=Gjovadje

|id=2502

|type=1ship

|access-date=17 November 2008

}} The {{GRT|10}} sailing vessel Papagallo was sunk,{{cite Uboat.net

|name=Papagallo

|id=4662

|type=1ship

|access-date=17 November 2008

}} and the Gjovadje was taken as a prize. New periscopes and a new gyrocompass were installed on U-4 later in the month. On 3 January 1916, operating again near the Gulf of Drin, Singule and U-4 seized another Albanian sailing vessel, Halil, and sank two smaller boats.{{cite Uboat.net

|name=Halil

|id=2684

|type=1ship

|access-date=17 November 2008

}}

In early February, U-4 sank the {{GRT|475}} French patrol vessel Jean Bart {{convert|6|nmi|km}} southwest of Cape Laghi, off Durazzo.{{cite Uboat.net

|name=Jean Bart II

|id=3131

|type=1ship

|access-date=17 November 2008

}}This Jean Bart is not the French dreadnought {{Ship|French battleship|Jean Bart|1911|2}} which was damaged by the Austro-Hungarian submarine {{SMU|U-12|Austria-Hungary|2}} on 21 December 1914. See: Gibson and Prendergast, p. 69. Just five days later, U-4 made an unsuccessful attack on a British {{sclass|Birmingham|cruiser|1}}. Over 26 and 27 March, U-4 participated in a search for the lost Austro-Hungarian submarine {{SMU|U-24|Austria-Hungary|2}}.The Austro-Hungarian submarine {{SMU|U-24|Austria-Hungary|2}}, was, in fact, the German Imperial Navy submarine {{SMU|UC-12||2}} operating under the Austro-Hungarian flag (see Gardiner, p. 341). UC-12, a coastal minelaying submarine, was destroyed on 12 March 1916 when the crew deployed the boat's tenth mine, which malfunctioned and exploded, sinking the U-boat with all hands. See: {{cite book | last = Messimer | first = Dwight R. | title = Verschollen: World War I U-boat Losses | location = Annapolis, Maryland | publisher = Naval Institute Press | year = 2002 | isbn = 978-1-55750-475-3 | oclc = 231973419 | page = 249}} Three days later, U-4 sank the British schooner John Pritchard Of Carnar with explosive charges off the island of Antipaxos.Sieche, pp. 20–21. In July, U-4 was outfitted with a new Škoda 7 cm guns deck gun,Sieche, p. 21. which equaled the main gun planned for the {{sclass|U-20|submarine|4}}, under construction at the time.Gardnier, pp. 343–44.

On 2 August, U-4 missed an Italian {{sclass|Nino Bixio|cruiser|1}} in a torpedo attack, and three days later, was missed by two torpedoes in an attack by an enemy submarine. A week later, U-4 successfully torpedoed and sank the Italian schooner Ponte Maria off Brindisi and weathered another unsuccessful enemy submarine attack. Two days later, on 14 August, U-4 closed out her busy month of August by attacking the British steamer Inverbervie off Cape Nau.Sieche (p. 21) reports that a ship named Inverberbie was sunk by U-4 on that date. Haworth reports no ships of any nationality of the name Inverberbie, but one British ship by the name Inverbervie. Helgason shows the same Inverbervie as either being sunk by U-4 or by a mine laid by the German U-boat {{SMU|UC-14||2}} on 14 September 1916, which is the same fate reported by Haworth.
For Haworth, see: {{csr|register=MSI|id=159996|shipname=Inverbervie |access–date=17 November 2008}}
For Helgason, see:{{cite Uboat.net

|name=Inverbervie

|id=3034

|type=1ship

|access-date=17 November 2008

}} Some two months later, U-4 sank the Italian tanker Margaretha at position {{coord|40|1|N|17|44|E|display=inline}}. Margaretha, originally the J.M.Lennard & Sons ship Atilla, went down without any reported loss of life on 13 October.{{cite Uboat.net

|name=Margaretha

|id=3905

|type=1ship

|access-date=17 November 2008

}}{{csr|register=MSI|id=1089726|shipname=Margaretha |access–date=17 November 2008}}

= 1917–1918 =

In early May 1917, U-4 sank the steamer Perseo—the second largest ship sunk by the boat—in the Ionian Sea. Although Perseo was serving as an Italian troop transport at the time, there are no reports of casualties in the 4 May attack.{{cite Uboat.net

|name=Perseo

|id=4750

|type=1ship

|access-date=17 November 2008

}} In mid-May 1917, U-4 participated in a support role in a raid on the Otranto Barrage that precipitated the Battle of Otranto Straits. On the night of 14/15 May, the Austro-Hungarian cruisers {{SMS|Helgoland|Austria-Hungary|2}}, {{SMS|Saida|1912|2}}, and {{SMS|Novara|1912|2}} attacked the drifters that deployed the anti-submarine nets that formed part of the Barrage, sinking 14, damaging 5, and taking 72 prisoners.Gibson and Prendergast, pp. 254–55.Joseph Watt, the commander of the British drifter Gowan Lea, was awarded the Victoria Cross for his actions in refusing to surrender to one of the Austrian cruisers. Destroyers {{SMS|Csepel||2}} and {{SMS|Balaton||2}} were sent to simultaneously attack Italian transports shuttling between Italy and Valona, and sank an Italian destroyer and a munitions ship. U-4, which was posted near Valona, was a part of a force of three U-boats intended to intercept British and Italian ships responding to the attacks; the other two were the Austro-Hungarian {{SMU|U-27|Austria-Hungary|2}} (assigned to patrol between Brindisi and Cattaro) and the German {{SMU|UC-25||2}} (assigned to mine Brindisi). A squadron of British cruisers and Italian and French destroyers joined the battle against the Austro-Hungarian cruisers on 15 May. Several ships on each side were damaged by the time the engagement was broken off. As a result of the attacks the drifter line of the Barrage was moved farther south and maintained only during the day, a success for the Central Powers. U-4 did not take any offensive action during the raid and ensuing battle.

On 30 May at Corfu, U-4 torpedoed and sank the French passenger steamer SS Italia, in operation by the French Navy as an armed boarding ship.{{cite Uboat.net

|name=Italia

|id=7088

|type=1ship

|access-date=17 November 2008

}} On 19 June, U-4 scored a triple victory when she sank the French steamers Edouarde Corbière and Cefira and the Greek ship Kerkyra off Taranto.{{cite Uboat.net

|name=Kerkyra

|id=3303

|type=1ship

|access-date=17 November 2008

}} U-4 sank what would be her final ship on 12 July, when she torpedoed the French tug Berthilde off Cape Stilo. In September, U-4 received a new bulwark on her conning tower.

U-4 arrived at Pola for the final time on 1 November 1918 and was there at the war's end. She was ceded to France as a war reparation and scrapped in 1920. U-4 was the longest serving Austro-Hungarian submarine, and sank a total of {{GRT|14,928}} and 7,345 tons enemy shipping during the war.

Summary of raiding history

class="wikitable sortable"
width="140px"\|Date ! width="140px"\|Name ! width="160px"\|Nationality ! width="25px" \|TonnageMerchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement. ! width="160px"\|Fate{{cite Uboat.net \|id=kuk4 \|name=KUK U 4 \|type=1boat \|access-date=21 January 2015 }}
align="right"\|28 November 1914 \|align="left" \|Fiore Del Mare \|align="left" \|{{flag\|Albania\|1914\|civil}} \|align="right"\|13 \|align="left" \|Captured as prize
align="right"\|9 June 1915 \|align="left" \|{{HMS\|Dublin\|1912\|6}} \|align="left" \|{{navy\|United Kingdom}} \|align="right"\|5,400 \|align="left" \|Damaged
align="right"\|18 July 1915 \|align="left" \|{{ship\|Italian cruiser\|Giuseppe Garibaldi\|1899\|2}} \|align="left" \|{{navy\|Kingdom of Italy}} \|align="right"\|7,234 \|align="left" \|Sunk
align="right"\|9 December 1915 \|align="left" \|Gjovadje \|align="left" \|{{flag\|Albania\|1914\|civil}} \|align="right"{{n/a}} \|align="left" \|Captured as prize
align="right"\|9 December 1915 \|align="left" \|Papagallo \|align="left" \|{{flag\|Albania\|1914\|civil}} \|align="right"\|10 \|align="left" \|Sunk
align="right"\|3 January 1916 \|align="left" \|Halil \|align="left" \|{{flag\|Albania\|1914\|civil}} \|align="right"\|3 \|align="left" \|Captured as prize
align="right"\|2 February 1916 \|align="left" \|Jean Bart II \|align="left" \|{{navy\|France}} \|align="right"\|475 \|align="left" \|Sunk
align="right"\|30 March 1916 \|align="left" \|John Pritchard \|align="left" \|{{flag\|United Kingdom\|civil}} \|align="right"\|118 \|align="left" \|Sunk
align="right"\|14 August 1916 \|align="left" \|Pantellaria \|align="left" \|{{flag\|Kingdom of Italy\|civil}} \|align="right"\|204 \|align="left" \|Sunk
align="right"\|14 September 1916 \|align="left" \|HMML 255 \|align="left" \|{{navy\|United Kingdom}} \|align="right"\|37 \|align="left" \|Sunk
align="right"\|14 September 1916 \|align="left" \|HMML 253 \|align="left" \|{{navy\|United Kingdom}} \|align="right"\|37 \|align="left" \|Sunk
align="right"\|14 September 1916 \|align="left" \|HMML 230 \|align="left" \|{{navy\|United Kingdom}} \|align="right"\|37 \|align="left" \|Sunk
align="right"\|14 September 1916 \|align="left" \|Italia \|align="left" \|{{flag\|Kingdom of Italy\|civil}} \|align="right"\|3,498 \|align="left" \|Damaged
align="right"\|14 September 1916 \|align="left" \|HMML 246 \|align="left" \|{{navy\|United Kingdom}} \|align="right"\|37 \|align="left" \|Damaged
align="right"\|14 September 1916 \|align="left" \|Inverbervie \|align="left" \|{{flag\|United Kingdom\|civil}} \|align="right"\|4,309 \|align="left" \|Sunk
align="right"\|13 October 1916 \|align="left" \|Margaretha \|align="left" \|{{flag\|Kingdom of Italy\|civil}} \|align="right"\|2,092 \|align="left" \|Sunk
align="right"\|4 May 1917 \|align="left" \|Perseo \|align="left" \|{{flag\|Kingdom of Italy\|civil}} \|align="right"\|4,857 \|align="left" \|Sunk
align="right"\|30 May 1917 \|align="left" \|Italia \|align="left" \|{{navy\|France}} \|align="right"\|1,305 \|align="left" \|Sunk
align="right"\|19 June 1917 \|align="left" \|Edouard Corbiere \|align="left" \|{{navy\|France}} \|align="right"\|475 \|align="left" \|Sunk
align="right"\|19 June 1917 \|align="left" \|Cefira \|align="left" \|{{flag\|France\|civil}} \|align="right"\|411 \|align="left" \|Sunk
align="right"\|12 July 1917 \|align="left" \|Berthilde \|align="left" \|{{flag\|France\|civil}} \|align="right"\|672 \|align="left" \|Sunk

class="wikitable sortable"

width="140px"|Date

! width="140px"|Name

! width="160px"|Nationality

! width="25px" |TonnageMerchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement.

! width="160px"|Fate{{cite Uboat.net

|id=kuk4

|name=KUK U 4

|type=1boat

|access-date=21 January 2015

}}

align="right"|28 November 1914

|align="left" |Fiore Del Mare

|align="left" |{{flag|Albania|1914|civil}}

|align="right"|13

|align="left" |Captured as prize

align="right"|9 June 1915

|align="left" |{{HMS|Dublin|1912|6}}

|align="left" |{{navy|United Kingdom}}

|align="right"|5,400

|align="left" |Damaged

align="right"|18 July 1915

|align="left" |{{ship|Italian cruiser|Giuseppe Garibaldi|1899|2}}

|align="left" |{{navy|Kingdom of Italy}}

|align="right"|7,234

|align="left" |Sunk

align="right"|9 December 1915

|align="left" |Gjovadje

|align="left" |{{flag|Albania|1914|civil}}

|align="right"{{n/a}}

|align="left" |Captured as prize

align="right"|9 December 1915

|align="left" |Papagallo

|align="left" |{{flag|Albania|1914|civil}}

|align="right"|10

|align="left" |Sunk

align="right"|3 January 1916

|align="left" |Halil

|align="left" |{{flag|Albania|1914|civil}}

|align="right"|3

|align="left" |Captured as prize

align="right"|2 February 1916

|align="left" |Jean Bart II

|align="left" |{{navy|France}}

|align="right"|475

|align="left" |Sunk

align="right"|30 March 1916

|align="left" |John Pritchard

|align="left" |{{flag|United Kingdom|civil}}

|align="right"|118

|align="left" |Sunk

align="right"|14 August 1916

|align="left" |Pantellaria

|align="left" |{{flag|Kingdom of Italy|civil}}

|align="right"|204

|align="left" |Sunk