SMS Derfflinger
Encyclopedia
SMS Derfflinger"SMS" stands for "Seiner Majestät Schiff", or "His Majesty's Ship" in German. was a battlecruiser
Battlecruiser
Battlecruisers were large capital ships built in the first half of the 20th century. They were developed in the first decade of the century as the successor to the armoured cruiser, but their evolution was more closely linked to that of the dreadnought battleship...

 of the German Kaiserliche Marine
Kaiserliche Marine
The Imperial German Navy was the German Navy created at the time of the formation of the German Empire. It existed between 1871 and 1919, growing out of the small Prussian Navy and Norddeutsche Bundesmarine, which primarily had the mission of coastal defense. Kaiser Wilhelm II greatly expanded...

 built just before the outbreak of World War I
World War I
World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

. She was the lead vessel of her class of three ships; her sister ship
Sister ship
A sister ship is a ship of the same class as, or of virtually identical design to, another ship. Such vessels share a near-identical hull and superstructure layout, similar displacement, and roughly comparable features and equipment...

s were and . The s were larger and featured significant improvements over the previous German battlecruisers, in terms of armament, armor protection, and cruising range. The ship was named after Field Marshal
Generalfeldmarschall
Field Marshal or Generalfeldmarschall in German, was a rank in the armies of several German states and the Holy Roman Empire; in the Austrian Empire, the rank Feldmarschall was used...

 Georg von Derfflinger
Georg von Derfflinger
Georg von Derfflinger was a field marshal in the army of Brandenburg-Prussia during and after the Thirty Years' War .-Early years:...

 who fought in the Thirty Years' War
Thirty Years' War
The Thirty Years' War was fought primarily in what is now Germany, and at various points involved most countries in Europe. It was one of the most destructive conflicts in European history....

.

Derfflinger was part of the I Scouting Group
I Scouting Group
The I Scouting Group was a special reconnaissance unit within the German Kaiserliche Marine. The unit was famously commanded by Admiral Franz von Hipper during World War I. The I Scouting Group was one of the most active formations in the High Seas Fleet during the war; the unit took part in every...

 for most of World War I, and was involved in several fleet actions during the war. She took part in the bombardments of English coastal towns, as well as the Battles of Dogger Bank
Battle of Dogger Bank (1915)
The Battle of Dogger Bank was a naval battle fought near the Dogger Bank in the North Sea on 24 January 1915, during the First World War, between squadrons of the British Grand Fleet and the German High Seas Fleet....

 and Jutland
Battle of Jutland
The Battle of Jutland was a naval battle between the British Royal Navy's Grand Fleet and the Imperial German Navy's High Seas Fleet during the First World War. The battle was fought on 31 May and 1 June 1916 in the North Sea near Jutland, Denmark. It was the largest naval battle and the only...

, where her stubborn resistance led to the British nicknaming her "Iron Dog". The ship was partially responsible for the sinking of two British battlecruisers at Jutland; Derfflinger and destroyed , and Lützow assisted her elder sister in the sinking of . Derfflinger was interned with the rest of the High Seas fleet at Scapa Flow
Scapa Flow
right|thumb|Scapa Flow viewed from its eastern endScapa Flow is a body of water in the Orkney Islands, Scotland, United Kingdom, sheltered by the islands of Mainland, Graemsay, Burray, South Ronaldsay and Hoy. It is about...

 following the armistice in November 1918. Under the orders of Rear Admiral Ludwig von Reuter
Ludwig von Reuter
Ludwig von Reuter was a German admiral during World War I, who commanded the Imperial German Navy's High Seas Fleet when it was interned at Scapa Flow at the end of the war. On 21 June 1919 he ordered the scuttling of the fleet to prevent the British from seizing the ships.-Early life:Reuter was...

, the interned ships were scuttled
Scuttling of the German fleet in Scapa Flow
The scuttling of the German fleet took place at the Royal Navy's base at Scapa Flow, in Scotland, after the end of the First World War. The High Seas Fleet had been interned there under the terms of the Armistice whilst negotiations took place over the fate of the ships...

 on 21 June 1919;
Derfflinger sank at 14:45.The times used in this article are in CET
Central European Time
Central European Time , used in most parts of the European Union, is a standard time that is 1 hour ahead of Coordinated Universal Time . The time offset from UTC can be written as +01:00...

, which is congruent with the German perspective. This is one hour ahead of UTC, which is commonly used in British works.

Construction

Built by Blohm & Voss at their yard in Hamburg, Derfflingers keel was laid in January 1912. She was to have been launched on 14 June 1913, but the wooden sledges upon which the ship rested became jammed; the ship moved only 30–40 centimeters. A second attempt was successful on 12 July 1913. A crew composed of dockyard workers took the ship around the Skagen
Skagen
Skagen is a projection of land and a town, with a population of 8,515 , in Region Nordjylland on the northernmost tip of Vendsyssel-Thy, a part of the Jutland peninsula in northern Denmark...

 to Kiel. In late October, the vessel was assigned to the I Scouting Group
I Scouting Group
The I Scouting Group was a special reconnaissance unit within the German Kaiserliche Marine. The unit was famously commanded by Admiral Franz von Hipper during World War I. The I Scouting Group was one of the most active formations in the High Seas Fleet during the war; the unit took part in every...

, but damage to the ship's turbines
Steam turbine
A steam turbine is a mechanical device that extracts thermal energy from pressurized steam, and converts it into rotary motion. Its modern manifestation was invented by Sir Charles Parsons in 1884....

 during trials prevented her from joining the unit until 16 November.

On completion she displaced nearly 27000 MT (26,573.5 LT) and was 210 m (689 ft) long. The ship had a crew of 44 officers and 1,068 enlisted men. Derfflinger was equipped with two sets of high- and low-pressure turbines powered by 14 coal-burning boilers that drove four propellers. She was capable of a top speed of 26.4 kn (14.4 m/s), Due to the outbreak of war in the summer of 1914, Derfflinger was forced to conduct her trials in shallow waters close to Germany; in deeper water an additional 2 kn (1.1 m/s) was possible. See: Staff, p. 35 and could steam for 5600 nautical miles (10,371.2 km) at a cruising speed of 14 kn (7.6 m/s). In early August 1915, a derrick
Derrick
A derrick is a lifting device composed of one tower, or guyed mast such as a pole which is hinged freely at the bottom. It is controlled by lines powered by some means such as man-hauling or motors, so that the pole can move in all four directions. A line runs up it and over its top with a hook on...

 was mounted amidships, and tests with Hansa-Brandenburg W seaplane
Seaplane
A seaplane is a fixed-wing aircraft capable of taking off and landing on water. Seaplanes that can also take off and land on airfields are a subclass called amphibian aircraft...

s were conducted.

Mounting a main armament of eight 30.5 cm (12 in) guns
30.5 cm SK L/50 gun
The 30.5 cm SK L/50 gunIn Imperial German Navy gun nomenclature, "SK" denotes that the gun is quick firing, while the L/50 denotes the length of the gun. In this case, the L/50 gun is 50 calibers, meaning that the gun is 50 times as long as it is in diameter. was a heavy gun mounted on 16 of...

, Derfflinger was the largest and most powerful German battlecruiser at the time. The ship's armament was rounded out by twelve 15 cm (5.9 in) guns in single casemate mounts and eight 8.8 cm (3.45 in) guns, also placed in casemates, though four of these were removed in 1916. An additional four 8.8 cm flak guns were installed amidships. Four 50 cm (19.7 in) submerged torpedo tubes were carried; one was located in the bow, two on the broadside, and one in the stern.

Service

Bombardment of Scarborough, Hartlepool, and Whitby

Derfflingers first combat operation was a raid on the English coastal towns of Scarborough, Hartlepool
Hartlepool
Hartlepool is a town and port in North East England.It was founded in the 7th century AD, around the Northumbrian monastery of Hartlepool Abbey. The village grew during the Middle Ages and developed a harbour which served as the official port of the County Palatine of Durham. A railway link from...

, and Whitby
Whitby
Whitby is a seaside town, port and civil parish in the Scarborough borough of North Yorkshire, England. Situated on the east coast of Yorkshire at the mouth of the River Esk, Whitby has a combined maritime, mineral and tourist heritage, and is home to the ruins of Whitby Abbey where Caedmon, the...

. One raid had already been conducted by the battlecruisers of the I Scouting Group, on the town of Yarmouth
Raid on Yarmouth
The Raid on Yarmouth, which took place on 3 November 1914, was an attack by the German Navy on the British North Sea port and town of Great Yarmouth. Little damage was done to the town since shells only landed on the beach after German ships laying mines offshore were interrupted by British...

 in late 1914. Admiral Friedrich von Ingenohl
Friedrich von Ingenohl
Gustav Heinrich Ernst Friedrich von Ingenohl was a German admiral from Neuwied best known for his command of the German High Seas Fleet at the beginning of World War I....

, the commander of the High Seas Fleet
High Seas Fleet
The High Seas Fleet was the battle fleet of the German Empire and saw action during World War I. The formation was created in February 1907, when the Home Fleet was renamed as the High Seas Fleet. Admiral Alfred von Tirpitz was the architect of the fleet; he envisioned a force powerful enough to...

, decided to conduct another raid on the English coast. His goal was to lure a portion of the Grand Fleet into combat where it could be isolated and destroyed. At 03:20 on 15 December, Rear Admiral Franz von Hipper
Franz von Hipper
Franz Ritter von Hipper was an admiral in the German Imperial Navy . Franz von Hipper joined the German Navy in 1881 as an officer cadet. He commanded several torpedo boat units and served as watch officer aboard several warships, as well as Kaiser Wilhelm II's yacht Hohenzollern...

, with his flag in , departed the Jade estuary. Following Seydlitz were Derfflinger, , , and , along with the light cruisers Kolberg, Strassburg, Stralsund, and Graudenz, and two squadrons of torpedo boats. The ships sailed north past the island of Heligoland
Heligoland
Heligoland is a small German archipelago in the North Sea.Formerly Danish and British possessions, the islands are located in the Heligoland Bight in the south-eastern corner of the North Sea...

, until they reached the Horns Reef
Horns Reef
Horns Rev is a shallow area in the eastern North Sea, about 15 km / 10 miles off the westernmost point of Denmark, Blåvands Huk...

 lighthouse, at which point the ships turned west towards Scarborough. Twelve hours after Hipper left the Jade, the High Seas Fleet departed to provide distant cover. The main fleet consisted of 14 dreadnought
Dreadnought
The dreadnought was the predominant type of 20th-century battleship. The first of the kind, the Royal Navy's had such an impact when launched in 1906 that similar battleships built after her were referred to as "dreadnoughts", and earlier battleships became known as pre-dreadnoughts...

s, eight pre-dreadnought
Pre-dreadnought
Pre-dreadnought battleship is the general term for all of the types of sea-going battleships built between the mid-1890s and 1905. Pre-dreadnoughts replaced the ironclad warships of the 1870s and 1880s...

s and a screening force of two armored cruiser
Armored cruiser
The armored cruiser was a type of warship of the late 19th and early 20th centuries. Like other types of cruiser, the armored cruiser was a long-range, independent warship, capable of defeating any ship apart from a battleship, and fast enough to outrun any battleships it encountered.The first...

s, seven light cruiser
Light cruiser
A light cruiser is a type of small- or medium-sized warship. The term is a shortening of the phrase "light armored cruiser", describing a small ship that carried armor in the same way as an armored cruiser: a protective belt and deck...

s, and 54 torpedo boats.

Some four months earlier, on 26 August 1914, the German light cruiser had run aground in the Gulf of Finland
Gulf of Finland
The Gulf of Finland is the easternmost arm of the Baltic Sea. It extends between Finland and Estonia all the way to Saint Petersburg in Russia, where the river Neva drains into it. Other major cities around the gulf include Helsinki and Tallinn...

; the wreck was captured by the Russian navy, which found code books used by the German navy, along with navigational charts for the North Sea. The Russians passed these documents to the Royal Navy, whose cryptographic unit—the so-called Room 40
Room 40
In the history of Cryptanalysis, Room 40 was the section in the Admiralty most identified with the British cryptoanalysis effort during the First World War.Room 40 was formed in October 1914, shortly after the start of the war...

—began decrypting German signals. On 14 December, they intercepted messages relating to the planned bombardment of Scarborough. However, the exact details of the plan were unknown, and the British assumed that the High Seas Fleet would remain safely in port, as in the previous bombardment. Vice Admiral David Beatty's
David Beatty, 1st Earl Beatty
Admiral of the Fleet David Richard Beatty, 1st Earl Beatty, GCB, OM, GCVO, DSO was an admiral in the Royal Navy...

 four battlecruisers, supported by the 3rd Cruiser Squadron and the 1st Light Cruiser Squadron, along with the 2nd Battle Squadron's six dreadnoughts, were to ambush Hipper's battlecruisers.

During the night of 15 December, the main body of the High Seas Fleet encountered British destroyers. Fearing the prospect of a nighttime torpedo attack, Admiral Ingenohl ordered the ships to retreat. Hipper was unaware of Ingenohl's reversal, and so he continued with the bombardment. Upon reaching the British coast, Hipper's battlecruisers split into two groups. Derfflinger and Von der Tann went south to shell Scarborough and Whitby while Seydlitz, Moltke, and Blücher went north to shell Hartlepool. By 09:45 on the 16th, the two groups had reassembled, and they began to retreat eastward.

By this time, Beatty's battlecruisers were positioned to block Hipper's chosen withdrawal route, while other forces were en route to complete the encirclement. At 12:25, the light cruisers of the II Scouting Group began to pass through the British forces searching for Hipper. One of the cruisers in the 2nd Light Cruiser Squadron spotted Stralsund and signaled a report to Beatty. At 12:30, Beatty turned his battlecruisers towards the German ships. Beatty presumed that the German cruisers were the advance screen for Hipper's ships, however those were some 50 km (31 mi) ahead. The 2nd Light Cruiser Squadron, which had been screening for Beatty's ships, detached to pursue the German cruisers, but a misinterpreted signal from the British battlecruisers sent them back to their screening positions.Beatty had intended to retain only the two rearmost light cruisers from Goodenough's
William Goodenough
Admiral Sir William Edmund Goodenough GCB, MVO was a senior Royal Navy officer of World War I.-Naval career:Goodenough joined the Royal Navy in 1882. He was appointed Commander of the Royal Naval College, Dartmouth in 1905...

 squadron; however, Nottingham
HMS Nottingham (1913)
The fifth HMS Nottingham was launched in 1913 and commissioned in 1914. A light Town class light cruiser of , in length and a complement of 401 men, she had thick armour plating and was armed with nine guns, one 13-pounder anti-aircraft gun and two torpedo tubes...

's signalman misinterpreted the signal, thinking that it was intended for the whole squadron, and thus transmitted it to Goodenough, who ordered his ships back into their screening positions ahead of Beatty's battlecruisers.
This confusion allowed the German light cruisers to slip away and alerted Hipper to the location of the British battlecruisers. The German battlecruisers wheeled to the northeast of the British forces and escaped.

Both the British and the Germans were disappointed that they failed to effectively engage their opponents. Admiral Ingenohl's reputation suffered greatly as a result of his timidity. Moltkes captain was furious; he stated that Ingenohl had turned back "because he was afraid of 11 British destroyers which could have been eliminated...under the present leadership we will accomplish nothing." The official German history criticized Ingenohl for failing to use his light forces to determine the size of the British fleet, stating: "he decided on a measure which not only seriously jeopardized his advance forces off the English coast but also deprived the German Fleet of a signal and certain victory."

Battle of Dogger Bank

In early January 1915, the German naval command became aware that British ships were reconnoitering in the Dogger Bank
Dogger Bank
Dogger Bank is a large sandbank in a shallow area of the North Sea about off the east coast of England. It extends over approximately , with its dimensions being about long and up to broad. The water depth ranges from 15 to 36 metres , about shallower than the surrounding sea. It is a...

 area. Admiral Ingenohl was initially reluctant to attempt to destroy these forces, because the I Scouting Group was temporarily weakened while Von der Tann was in drydock for periodic maintenance. Konteradmiral Richard Eckermann, the Chief of Staff of the High Seas Fleet, insisted on the operation, and so Ingenohl relented and ordered Hipper to take his battlecruisers to the Dogger Bank. On 23 January, Hipper sortied, with Seydlitz in the lead, followed by Moltke, Derfflinger, and Blücher, along with the light cruisers Graudenz, Rostock, Stralsund, and Kolberg and 19 torpedo boats from V Flotilla and II and XVIII Half-Flotillas. Graudenz and Stralsund were assigned to the forward screen, while Kolberg and Rostock were assigned to the starboard and port, respectively. Each light cruiser had a half-flotilla of torpedo boats attached.

Again, interception and decryption of German wireless signals played an important role. Although they were unaware of the exact plans, the cryptographers of Room 40 deduced that Hipper would be conducting an operation in the Dogger Bank area. To counter it, Beatty's 1st Battlecruiser Squadron
1st Battlecruiser Squadron (United Kingdom)
The First Battlecruiser Squadron was a Royal Navy squadron of battlecruisers that saw service as part of the Grand Fleet during the First World War. It was created in 1909 as the First Cruiser Squadron and was renamed in 1913 to First Battle Cruiser Squadron. It participated in the battles of...

, Rear Admiral Archibald Moore's 2nd Battlecruiser Squadron
2nd Battlecruiser Squadron (United Kingdom)
The 2nd Battlecruiser Squadron was a Royal Navy squadron of battlecruisers that saw service as part of the Grand Fleet during the First World War.-August 1914:In August 1914, the 2nd Battlecruiser Squadron was in the Mediterranean, and consisted of:-1915:...

 and Commodore William Goodenough
William Goodenough
Admiral Sir William Edmund Goodenough GCB, MVO was a senior Royal Navy officer of World War I.-Naval career:Goodenough joined the Royal Navy in 1882. He was appointed Commander of the Royal Naval College, Dartmouth in 1905...

's 2nd Light Cruiser Squadron were to rendezvous with Commodore Reginald Tyrwhitt
Reginald Tyrwhitt
Admiral of the Fleet Sir Reginald Yorke Tyrwhitt, 1st Baronet, GCB, DSO was a senior officer of the Royal Navy in World War I who commanded light forces stationed at Harwich on the east coast of England during the first part of the war.-Naval career:Tyrwhitt entered the Navy as a cadet in July, 1885...

's Harwich Force
Harwich Force
The Harwich Force was a squadron of the Royal Navy, formed during the First World War, that went on to play a significant role in the war.-History:...

 at 08:00 on 24 January, approximately 30 mi (48.3 km) north of the Dogger Bank.

At 08:14, Kolberg spotted the light cruiser and several destroyers from the Harwich Force.Aurora challenged Kolberg with a search light, at which point Kolberg attacked Aurora and scored two hits. Aurora returned fire and scored two hits on Kolberg in retaliation. Hipper immediately turned his battlecruisers towards the gunfire, when, almost simultaneously, Stralsund spotted a large amount of smoke to the northwest of her position. This was identified as a number of large British warships steaming towards Hipper's ships.

Hipper turned south to flee, but was limited to 23 knots (45.1 km/h), which was the maximum speed of the older armored cruiser Blücher. The pursuing British battlecruisers were steaming at 27 knots (52.9 km/h), and quickly caught up to the German ships. At 09:52, the battlecruiser opened fire on Blücher from a range of approximately 20,000 yards (18,300 m); shortly thereafter, and began firing as well. At 10:09, the British guns made their first hit on Blücher. Two minutes later, the German ships began returning fire, primarily concentrating on Lion, from a range of 18,000 yards (15,460 m). At 10:28, Lion was struck on the waterline, which tore a hole in the side of the ship and flooded a coal bunker. At 10:30, , the fourth ship in Beatty's line, came within range of Blücher and opened fire. By 10:35, the range had closed to 17,500 yards (16,000 m), at which point the entire German line was within the effective range of the British ships. Beatty ordered his battlecruisers to engage their German counterparts.Thus, Lion on Seydlitz, Tiger on Moltke, Princess Royal on Derfflinger, and New Zealand on Blücher. Confusion aboard Tiger led the captain to believe he was to fire on Seydlitz, which left Moltke able to fire without distraction. During this period of the battle, Derfflinger was hit once, but the shell did only minor damage. Two armor plates in the hull were forced inward and some of the protective coal bunkers were flooded.

At 10:40, one of Lions 13.5 in (34.3 cm) shells struck Seydlitz causing nearly catastrophic damage that knocked out both of the rear turrets and killed 159 men. The executive officer ordered the flooding of both magazines to avoid a flash fire that would have destroyed the ship.This was to have far-reaching consequences, for immediately after the battle, the German Naval Command launched an investigation which resulted in the adoption of anti-flash measures to prevent the type of spectacular explosions that resulted in the destruction of Indefatigable and Queen Mary at Jutland
Battle of Jutland
The Battle of Jutland was a naval battle between the British Royal Navy's Grand Fleet and the Imperial German Navy's High Seas Fleet during the First World War. The battle was fought on 31 May and 1 June 1916 in the North Sea near Jutland, Denmark. It was the largest naval battle and the only...

 a year later. See: Tarrant, p. 40
By this time, the German battlecruisers had zeroed in on Lion, scoring repeated hits. At 11:01, an 11 in (27.9 cm) shell from Seydlitz struck Lion and knocked out two of her dynamos. At 11:18, two of Derfflinger's 12 in (30.5 cm) shells hit Lion, one of which struck the waterline and penetrated the belt, allowing seawater to enter the port feed tank. Lion had to turn off its engines due to seawater contamination and as a result fell out of the line.

By this time, Blücher was severely damaged after having been pounded by heavy shells. The chase ended when there were several reports of U-boats ahead of the British ships; Beatty quickly ordered evasive maneuvers, which allowed the German ships to increase the distance to their pursuers. At this time, Lions last operational dynamo failed, which dropped her speed to 15 knots. Beatty, in the stricken Lion, ordered the remaining battlecruisers to "Engage the enemy's rear," but signal confusion caused the ships to solely target Blücher, allowing Moltke, Seydlitz, and Derfflinger to escape. Blücher was hit by over 70 shells from the British battlecruisers over the course of the battle. The severely damaged warship capsized and sank at approximately 13:10. By the time Beatty regained control over his ships, after having boarded Princess Royal, the German ships had too great a lead for the British to catch them; at 13:50, he broke off the chase.

Bombardment of Yarmouth and Lowestoft

Derfflinger also took part in the bombardment of Yarmouth and Lowestoft on 24–25 April 1916. Hipper was away on sick leave, so the German ships were under the command of Konteradmiral Friedrich Bödicker
Friedrich Bödicker
Vice Admiral Friedrich Bödicker, was a flag officer of the Kaiserliche Marine during the First World War.-Biography:...

. Derfflinger, her newly commissioned sister ship
Sister ship
A sister ship is a ship of the same class as, or of virtually identical design to, another ship. Such vessels share a near-identical hull and superstructure layout, similar displacement, and roughly comparable features and equipment...

 , and the veterans Moltke, Seydlitz and Von der Tann left the Jade Estuary at 10:55 on 24 April. They were supported by a screening force of 6 light cruisers and two torpedo boat flotillas. The heavy units of the High Seas Fleet, under the command of Admiral Reinhard Scheer
Reinhard Scheer
Reinhard Scheer was an Admiral in the German Kaiserliche Marine. Scheer joined the navy in 1879 as an officer cadet; he progressed through the ranks, commanding cruisers and battleships, as well as major staff positions on land. At the outbreak of World War I, Scheer was the commander of the II...

, sailed at 13:40, with the objective to provide distant support for Bödicker's ships. The British Admiralty was made aware of the German sortie through the interception of German wireless
Wireless
Wireless telecommunications is the transfer of information between two or more points that are not physically connected. Distances can be short, such as a few meters for television remote control, or as far as thousands or even millions of kilometers for deep-space radio communications...

 signals, and deployed the Grand Fleet at 15:50.

By 14:00, Bödicker's ships had reached a position off Norderney
Norderney
Norderney is one of the seven populated East Frisian Islands off the North Sea coast of Germany. It is also a municipality in the district of Aurich in Lower Saxony....

, at which point he turned his ships northward to avoid the Dutch observers on the island of Terschelling
Terschelling
Terschelling is a municipality and an island in the northern Netherlands, one of the West Frisian Islands.Waddenislanders are known for their resourcefulness in using anything and everything that washes ashore. With few trees to use for timber, most of the farms and barns are built with masts...

. At 15:38, Seydlitz struck a naval mine
Naval mine
A naval mine is a self-contained explosive device placed in water to destroy surface ships or submarines. Unlike depth charges, mines are deposited and left to wait until they are triggered by the approach of, or contact with, an enemy vessel...

, which tore a 50-foot (15 m) hole in her hull, just abaft of the starboard broadside torpedo tube, allowing 1,400 short tons (1,250 long tons) of water to enter the ship. Seydlitz turned back, with the screen of light cruisers, at a speed of 15 knots (29.4 km/h). The four remaining battlecruisers turned south immediately in the direction of Norderney to avoid further mine damage. By 16:00, Seydlitz was clear of imminent danger, so the ship stopped to allow Bödicker to disembark. The torpedo boat brought Bödicker to Lützow.

At 04:50 on 25 April, the German battlecruisers were approaching Lowestoft when the light cruisers and , which had been covering the southern flank, spotted the light cruisers and destroyers of Commodore Tyrwhitt's Harwich Force. Bödicker refused to be distracted by the British ships, and instead trained his ships' guns on Lowestoft. At a range of approximately 14000 yd (12,801.6 m), the German battlecruisers destroyed two 6 in (15 cm) shore batteries and inflicted other damage to the town, including the destruction of some 200 houses.

At 05:20, the German raiders turned north, towards Yarmouth, which they reached by 05:42. The visibility was so poor that the German ships fired one salvo
Salvo
A salvo is the simultaneous discharge of artillery or firearms including the firing of guns either to hit a target or to perform a salute.Troops armed with muzzleloaders required time in which to refill their arms with gun powder and shot...

 each, with the exception of Derfflinger, which fired fourteen rounds from her main battery. The German ships turned back south, and at 05:47 encountered for the second time the Harwich Force, which had by then been engaged by the six light cruisers of the screening force. Bödicker's ships opened fire from a range of 13,000 yards (12,000 m). Tyrwhitt immediately turned his ships around and fled south, but not before the cruiser sustained severe damage. Due to reports of British submarines and torpedo attacks, Bödicker broke off the chase and turned back east towards the High Seas Fleet. At this point, Scheer, who had been warned of the Grand Fleet's sortie from Scapa Flow, turned back towards Germany.

Battle of Jutland

Almost immediately after the Lowestoft raid, Admiral Reinhard Scheer
Reinhard Scheer
Reinhard Scheer was an Admiral in the German Kaiserliche Marine. Scheer joined the navy in 1879 as an officer cadet; he progressed through the ranks, commanding cruisers and battleships, as well as major staff positions on land. At the outbreak of World War I, Scheer was the commander of the II...

 began planning another foray into the North Sea. He had initially intended to launch the operation in mid-May, but the mine damage to Seydlitz had proved difficult to repair—Scheer was unwilling to embark on a major raid without his battlecruiser forces at full strength. At noon on 28 May, the repairs to Seydlitz were finally completed, and the ship returned to the I Scouting Group.

Derfflinger and the rest of Hipper's I Scouting Group battlecruisers lay anchored in the outer Jade roadstead
Roadstead
A roadstead is a place outside a harbor where a ship can lie at anchor. It is an enclosed area with an opening to the sea, narrower than a bay or gulf. It has a surface that cannot be confused with an estuary. It can be created artificially by jetties or dikes...

 on the night of 30 May 1916. The following morning, at 02:00 CET
Central European Time
Central European Time , used in most parts of the European Union, is a standard time that is 1 hour ahead of Coordinated Universal Time . The time offset from UTC can be written as +01:00...

, the ships steamed out towards the Skagerrak
Skagerrak
The Skagerrak is a strait running between Norway and the southwest coast of Sweden and the Jutland peninsula of Denmark, connecting the North Sea and the Kattegat sea area, which leads to the Baltic Sea.-Name:...

 at a speed of 16 knots (31.4 km/h). Derfflinger was the second ship in the line of five, ahead of Seydlitz, and to the rear of Lützow, the group flagship.Lützow had replaced Seydlitz as flagship of the I Scouting Group while the latter was in dock for repairs. The II Scouting Group, consisting of the light cruisers , Rear Admiral Bödicker
Friedrich Bödicker
Vice Admiral Friedrich Bödicker, was a flag officer of the Kaiserliche Marine during the First World War.-Biography:...

's flagship, , , and , and 30 torpedo boats of the II, VI, and IX Flotillas, accompanied Hipper's battlecruisers.

An hour and a half later, the High Seas Fleet under the command of Admiral Scheer
Reinhard Scheer
Reinhard Scheer was an Admiral in the German Kaiserliche Marine. Scheer joined the navy in 1879 as an officer cadet; he progressed through the ranks, commanding cruisers and battleships, as well as major staff positions on land. At the outbreak of World War I, Scheer was the commander of the II...

 left the Jade; the force was composed of 16 dreadnoughts. was in dock at the time. The High Seas Fleet was accompanied by the IV Scouting Group, composed of the light cruisers , , , , and , and 31 torpedo boats of the I, III, V, and VII Flotillas, led by the light cruiser Rostock. The six pre-dreadnoughts of the II Battle Squadron had departed from the Elbe roads at 02:45, and rendezvoused with the battle fleet at 05:00.

Shortly before 16:00, Hipper's force encountered the six ships of Vice Admiral Beatty's 1st
1st Battlecruiser Squadron (United Kingdom)
The First Battlecruiser Squadron was a Royal Navy squadron of battlecruisers that saw service as part of the Grand Fleet during the First World War. It was created in 1909 as the First Cruiser Squadron and was renamed in 1913 to First Battle Cruiser Squadron. It participated in the battles of...

 and 2nd
2nd Battlecruiser Squadron (United Kingdom)
The 2nd Battlecruiser Squadron was a Royal Navy squadron of battlecruisers that saw service as part of the Grand Fleet during the First World War.-August 1914:In August 1914, the 2nd Battlecruiser Squadron was in the Mediterranean, and consisted of:-1915:...

 battlecruiser squadrons. The German ships were the first to open fire, at a range of approximately 15,000 yards (14,000 m). When the British ships began returning fire, confusion amongst the British battlecruisers resulted in Moltke being engaged by both New Zealand and Tiger.Tiger misread the "distribution of fire" signal hoisted by Beatty's flagship Lion. The British rangefinders had misread the range to their German targets, and so the first salvos fired by the British ships fell a mile past the German battlecruisers. Due to errors in British communication, Derfflinger was unengaged during the first 10 minutes of the battle. Beatty intended his first two ships, Lion and Princess Royal, to engage Lützow; Queen Mary was to have fired on Derfflinger, but her captain misinterpreted his directions and attacked Seydlitz instead. See: Tarrant, p. 90 Derfflingers gunnery officer, Korvettenkapitän Georg von Hase later remarked "By some mistake we were being left out. I laughed grimly and now I began to engage our enemy with complete calm, as at gun practice, and with continually increasing accuracy." At 17:03, the British battlecruiser exploded after 15 minutes of gunfire from Von der Tann. Shortly thereafter the second half of Beatty's force, the four s of the 5th Battle Squadron, came into range and began firing at Von der Tann and Moltke.

Following severe damage inflicted by Lützow on Lion, Derfflinger lost sight of the British ship, and so at 17:16 transferred her fire to . Seydlitz was also engaging Queen Mary, and under the combined fire of the two battlecruisers, Queen Mary was hit repeatedly in quick succession. Observers on New Zealand and , the ships behind and ahead, respectively, reported three shells from a salvo of four struck the ship at the same time. Two more hits followed, and a gigantic explosion erupted amidships; a billowing cloud of black smoke poured from the burning ship, which had broken in two.

The leading ships of the German High Seas fleet had by 18:00 come within effective range of the British battlecruisers and Queen Elizabeth-class battleships and had begun trading shots with them. Between 18:09 and 18:19, Derfflinger was hit by a 38 cm (15 in) shell from either or . At 18:55, Derfflinger was hit again; this shell struck the bow and tore a hole that allowed some 300 tons of water to enter the ship.

Shortly after 19:00, the German cruiser had become disabled by a shell from the battlecruiser ; the German battlecruisers made a 16-point turn to the northeast and made for the crippled cruiser at high speed. At 19:15, they spotted the British armored cruiser , which had joined the attack on Wiesbaden. Hipper initially hesitated, believing the ship was the German cruiser Rostock, but at 19:16, Kapitan zur See Harder, Lützows commanding officer, ordered his ships' guns to fire. The other German battlecruisers and battleships joined in the melee; Defence was struck by several heavy-caliber shells from the German ships. One salvo penetrated the ship's ammunition magazines and a massive explosion destroyed the cruiser.

By 19:24, the 3rd Battlecruiser Squadron
3rd Battlecruiser Squadron (United Kingdom)
The 3rd Battlecruiser Squadron was a short-lived Royal Navy squadron of battlecruisers that saw service as part of the Grand Fleet during the First World War.-Creation:...

 had formed up with Beatty's remaining battlecruisers ahead of the German line. The leading British ships spotted Lützow and Derfflinger and began firing on them. In the span of eight minutes, the battlecruiser scored eight hits on Lützow. In return, both Lützow and Derfflinger concentrated their fire on their antagonist, and at 19:31, Derfflinger fired her final salvo at Invincible. Shortly thereafter the forward magazine detonated and the ship disappeared in a series of massive explosions.

By 19:30, the High Seas Fleet, which was by that point pursuing the British battlecruisers, had not yet encountered the Grand Fleet. Scheer had been considering retiring his forces before darkness exposed his ships to torpedo boat attack. He had not yet made a decision when his leading battleships encountered the main body of the Grand Fleet. This development made it impossible for Scheer to retreat, for doing so would have sacrificed the slower pre-dreadnought battleships of the II Battle Squadron. If he chose to use his dreadnoughts and battlecruisers to cover their retreat, he would have subjected his strongest ships to overwhelming British fire. Instead, Scheer ordered his ships to turn 16 points to starboard, which would bring the pre-dreadnoughts to the relative safety of the disengaged side of the German battle line.

Derfflinger and the other battlecruisers followed the move,With the exception of Lützow, which had lost speed and was unable to keep up. which put them astern of König. Hipper's badly battered ships gained a temporary moment of respite, and uncertainty over the exact location and course of Scheer's ships led Admiral Jellicoe
John Jellicoe, 1st Earl Jellicoe
Admiral of the Fleet John Rushworth Jellicoe, 1st Earl Jellicoe, GCB, OM, GCVO was a British Royal Navy admiral who commanded the Grand Fleet at the Battle of Jutland in World War I...

 to turn his ships eastward, towards what he thought was the likely path of the German retreat. The German fleet was instead sailing west, but Scheer ordered a second 16-point turn, which reversed course and pointed his ships at the center of the British fleet. The German fleet came under intense fire from the British line, and Scheer sent Derfflinger, Seydlitz, Moltke, and Von der Tann at high speed towards the British fleet, in an attempt to disrupt their formation and gain time for his main force to retreat. By 20:17, the German battlecruisers had closed to within 7700 yards of , at which point Scheer directed the ships to engage the lead ship of the British line. Three minutes later, the German battlecruisers turned in retreat, covered by a torpedo boat attack.

A pause in the battle at dusk (approximately from 20:20 to 21:10) allowed Derfflinger and the other German battlecruisers to cut away wreckage that interfered with the main guns, extinguish fires, repair the fire control and signal equipment, and prepare the searchlights for nighttime action. During this period, the German fleet reorganized into a well-ordered formation in reverse order, when the German light forces encountered the British screen shortly after 21:00. The renewed gunfire gained Beatty's attention, so he turned his battlecruisers westward. At 21:09, he sighted the German battlecruisers, and drew to within 8500 yards before opening fire at 21:20. In the ensuing melee, Derfflinger was hit several times; at 21:34, a heavy shell struck her last operational gun turret and put it out of action. The German ships returned fire with every gun available, and at 21:32 hit both Lion and Princess Royal in the darkness. The maneuvering of the German battlecruisers forced the leading I Battle Squadron to turn westward to avoid collision. This brought the pre-dreadnoughts of the II Battle Squadron directly between the two lines of battlecruisers. In doing so, this prevented the British ships from pursuing their German counterparts when they turned southward. The British battlecruisers opened fire on the old battleships; the German ships turned southwest to bring all of their guns to bear against the British ships. This engagement lasted only a few minutes before Admiral Mauve turned his ships 8-points to starboard; the British inexplicably did not pursue.
Close to the end of the battle, at 03:55, Hipper transmitted a report to Admiral Scheer informing him of the tremendous damage his ships had suffered. By that time, Derfflinger and Von der Tann had only two operational guns each, Moltke was flooded with 1,000 tons of water, and Seydlitz was severely damaged. Hipper reported: "I Scouting Group was therefore no longer of any value for a serious engagement, and was consequently directed to return to harbor by the Commander-in-Chief, while he himself determined to await developments off Horns Reef with the battlefleet."

During the course of the battle, Derfflinger was hit 17 times by heavy caliber shells and nine times by secondary guns. She was in dock for repairs until 15 October. Derfflinger fired 385 shells from her main battery, another 235 rounds from her secondary guns, and one torpedo. Her crew suffered 157 men killed and another 26 men wounded; this was the highest casualty rate on any ship not sunk during the battle. Because of her stalwart resistance at Jutland, the British nicknamed her "Iron Dog."

Later operations

During the Second Battle of Heligoland Bight
Second Battle of Heligoland Bight
The Second Battle of Heligoland Bight was a naval engagement during the First World War. On 17 November 1917, German minesweepers clearing a path through the British minefield in the Heligoland Bight near the coast of Germany were intercepted by two British light cruisers, and , performing...

 in November 1917, Derfflinger sailed from port to assist the German light cruisers of the II Scouting Group, but by the time she and the other battlecruisers arrived on the scene, the British raiders had fled northward.

In late 1917, the High Seas Fleet began to conduct anti-convoy raids in the North Sea between Britain and Norway. In October and December, German cruisers and destroyers intercepted and destroyed two British convoys to Norway. This prompted Beatty, now the Commander in Chief of the Grand Fleet, to detach several battleships and battlecruisers to protect convoys in the North Sea. This presented to Admiral Scheer the opportunity for which he had been waiting the entire war: the chance to isolate and eliminate a portion of the Grand Fleet. At 05:00 on 23 April 1918, the High Seas Fleet left harbor with the intention of intercepting one of the heavily escorted convoys. Wireless radio traffic was kept to a minimum to prevent the British from learning of the operation. By 14:10, the convoy had still not yet been located, and so Scheer turned the High Seas Fleet back towards German waters.

Fate

Derfflinger was to have taken part in what would have amounted to the "death ride" of the High Seas Fleet shortly before the end of World War I. The bulk of the High Seas Fleet was to have sortied from its base in Wilhelmshaven to engage the British Grand Fleet; Scheer
Reinhard Scheer
Reinhard Scheer was an Admiral in the German Kaiserliche Marine. Scheer joined the navy in 1879 as an officer cadet; he progressed through the ranks, commanding cruisers and battleships, as well as major staff positions on land. At the outbreak of World War I, Scheer was the commander of the II...

—by now the Großadmiral
Grand Admiral
Grand admiral is a historic naval rank, generally being the highest such rank present in any particular country. Its most notable use was in Germany — the German word is Großadmiral.-France:...

of the fleet—intended to inflict as much damage as possible on the British navy, in order to retain a better bargaining position for Germany, whatever the cost to the fleet. While the fleet was consolidating in Wilhelmshaven, war-weary sailors began deserting en masse. As Derfflinger and Von der Tann passed through the locks that separated Wilhelmshaven's inner harbor and roadstead, some 300 men from both ships climbed over the side and disappeared ashore.

On 24 October 1918, the order was given to sail from Wilhelmshaven. Starting on the night of 29 October, sailors mutinied
Wilhelmshaven mutiny
The Kiel mutiny was a major revolt by sailors of the German High Seas Fleet on 3 November 1918. The revolt triggered the German revolution which was to sweep aside the monarchy within a few days. It ultimately led to the end of the First World War and to the establishment of the Weimar Republic.-...

 on several battleships; three ships from the III Squadron refused to weigh anchors, and the battleships and reported acts of sabotage. The order to sail was rescinded in the face of this open revolt. The following month, the German Revolution toppled the monarchy and was quickly followed by the Armistice
Armistice with Germany (Compiègne)
The armistice between the Allies and Germany was an agreement that ended the fighting in the First World War. It was signed in a railway carriage in Compiègne Forest on 11 November 1918 and marked a victory for the Allies and a complete defeat for Germany, although not technically a surrender...

 that ended the war.
Following Germany's capitulation, the Allies demanded that the majority of the High Seas Fleet be interned in the British naval base in Scapa Flow
Scapa Flow
right|thumb|Scapa Flow viewed from its eastern endScapa Flow is a body of water in the Orkney Islands, Scotland, United Kingdom, sheltered by the islands of Mainland, Graemsay, Burray, South Ronaldsay and Hoy. It is about...

. On 21 November 1918, under the command of Rear Admiral Ludwig von Reuter
Ludwig von Reuter
Ludwig von Reuter was a German admiral during World War I, who commanded the Imperial German Navy's High Seas Fleet when it was interned at Scapa Flow at the end of the war. On 21 June 1919 he ordered the scuttling of the fleet to prevent the British from seizing the ships.-Early life:Reuter was...

, the ships sailed from their base in Germany for the last time. The fleet rendezvoused with the light cruiser Cardiff, before meeting a massive flotilla of some 370 British, American, and French warships for the voyage to Scapa Flow. Once the ships were interned, their breech locks were removed, which disabled their guns.

The fleet remained in captivity during the negotiations that ultimately produced the Versailles Treaty. It became apparent to Reuter that the British intended to seize the German ships on 21 June, which was the deadline by which Germany was to have signed the peace treaty. Unaware that the deadline had been extended to the 23rd, Reuter ordered his ships be sunk. On the morning of 21 June, the British fleet left Scapa Flow to conduct training maneuvers. With the majority of the British fleet away, Reuter transmitted the order to his ships at 11:20. Derfflinger sank at 14:45. The ship was raised in 1939 and was anchored, still capsized, off the island of Risa
Rysa Little
Rysa Little is an uninhabited island in the Orkney archipelago in Scotland. It is approximately 32 hectares in extent and rises to 20 metres above sea level....

 until 1946. Derfflinger was then sent to Faslane Port
HMNB Clyde
Her Majesty's Naval Base Clyde is one of three operating bases in the United Kingdom for the Royal Navy...

, where she was broken up by 1948. The ship's bell was delivered to the German Federal Navy
German Navy
The German Navy is the navy of Germany and is part of the unified Bundeswehr .The German Navy traces its roots back to the Imperial Fleet of the revolutionary era of 1848 – 52 and more directly to the Prussian Navy, which later evolved into the Northern German Federal Navy...

on 30 August 1965.
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