SMS Seydlitz

SMS Seydlitz was a 24988 MT battlecruiser of the Imperial German Navy, built in Hamburg. She was ordered in 1910 and commissioned in May 1913, the fourth battlecruiser built for the High Seas Fleet. She was named after Friedrich Wilhelm von Seydlitz, a Prussian general during the reign of King Frederick the Great and the Seven Years' War. Seydlitz represented the culmination of the first generation of German battlecruisers, which had started with the SMS Von der Tann in 1906, and continued with the pair of s ordered in 1907 and 1908. Seydlitz featured several incremental improvements over the preceding designs, including a redesigned propulsion system and an improved armor layout. The ship was also significantly larger than her predecessors—she was approximately 3,000 metric tons heavier than the Moltke-class ships.

Seydlitz participated in many of the large fleet actions during the First World War, including the battles of Dogger Bank and Jutland in the North Sea. The ship suffered severe damage during both of these engagements; during the Battle of Dogger Bank, a 13.5 in (34.3 cm) shell from the British battlecruiser HMS Lion (1910) struck Seydlitz's rearmost turret and nearly caused a magazine explosion that could have destroyed the ship. At the Battle of Jutland she was hit 21 times by heavy caliber shells, one of which penetrated the working chamber of the aft superfiring turret. Although the resulting fire destroyed the turret, the safety measures put in place after the battle of Dogger Bank prevented a worse catastrophe. The ship was also hit by a torpedo during the battle, causing her to take in over 5,300 metric tons of water, and her freeboard was reduced to 2.5 m. She had to be lightened significantly to permit her crossing of the Jade Bar. The ship inflicted severe damage on her British opponents as well; early in the battle, salvos from both Seydlitz and SMS Derfflinger destroyed the battlecruiser HMS Queen Mary in a matter of seconds.

Seydlitz also saw some limited action in the Baltic Sea, when she provided screening for the German flotilla that attempted to clear the Gulf of Riga in 1915. As with the rest of the German battlecruisers that survived the war, the ship was interned in Scapa Flow in 1918. The ship, along with the rest of the High Seas Fleet, was scuttled in June 1919, to prevent its seizure by the British Royal Navy. She was raised on 2 November 1928, and scrapped by 1930 in Rosyth.

Development


Despite the success of the previous German battlecruisers designs—those of SMS Von der Tann and the —there was still significant debate as to how new ships of the type were to be designed. In 1909, the Reichsmarineamt (Navy Department) requested Admiral Alfred von Tirpitz, the State Secretary, provide them with the improvements that would be necessary for the next battlecruiser design. Tirpitz continued to push for the use of battlecruisers solely as fleet scouts and to destroy enemy cruisers, along the lines of the battlecruisers employed by the British Royal Navy. The Kaiser, Wilhelm II, and the majority of the Navy Department argued that due to Germany's numerical inferiority compared to the Royal Navy, the ships would also have to fight in the line of battle. Ultimately, the Kaiser and the Navy Department won the debate, and the battlecruiser for the 1909–1910 building year would continue in the pattern of the previous Von der Tann and Moltke-class designs.

Financial constraints meant that there would have to be a trade-off between speed, battle capabilities, and displacement. The initial design specifications mandated that speed was to have been at least as high as with the Moltke class, and that the ship was to have been armed with either eight 305 mm guns or ten 280 mm guns. The design staff considered triple turrets, but these were discarded when it was decided that the standard 280 mm twin turret was sufficient.

In August 1909, the Reichstag stated that it would tolerate no increases in cost over the Moltke-class battlecruisers, and so for a time, the Navy Department considered shelving the new design and instead to build a third Moltke-class ship. Admiral Tirpitz was able to negotiate a discount on armor plate from both Krupp and Dillingen; Tirpitz also pressured the ship's builder, Blohm & Voss, for a discount. These cost reductions freed up sufficient funds to make some material improvements to the design. On 27 January 1910, the Kaiser approved the design for the new ship, ordered under the provisional name "Cruiser J".

General characteristics
Seydlitz was 200 m long at the waterline, and 200.6 m overall. The ship had a beam of 28.5 m, which was increased to 28.8 m with anti-torpedo nets equipped. She had a draft of 9.29 m forward and 9.09 m aft. Seydlitz displaced 24,988 metric tons as designed, and carrying a full load, the ship displaced 28,550 metric tons. Seydlitz had a double bottom for 76 percent of the length of the hull. The ship carried a number of smaller boats, including one picket boat, three barges, two launches, two yawls, and two dinghies. Seydlitz was described as having been a good sea boat with gentle motion. The ship lost up to 60 percent of her speed at a hard rudder, and would heel over to 9 degrees. The ship had a standard complement of 43 officers and 1025 men, and while she served as the I Scouting Group flagship, she was manned by an additional 13 officers and 62 men.

Propulsion
Seydlitz's steam plant consisted of 27 Schulz-Thornycroft small-tube boilers with 52 fire boxes—2 fire boxes per boiler—divided into three engine rooms. These powered two sets of Parsons direct-drive turbines. Each set consisted of a high-pressure outboard turbine which exhausted into a low-pressure inboard turbine. Each turbine drove a 3-bladed screw that was 3.88 m in diameter. Steering was controlled by tandem rudders. The engines were designed to produce 63000 shp and a top speed of 26.5 knots. Using forced draft on trials, the engines provided up to 89738 shp and a top speed of 28.1 knots. The ship carried up to 3600 t of coal. With full fuel stores, Seydlitz could steam at a cruising speed of 14 knots for 4200 nmi. Electrical power was provided by six turbo generators that produced 1,800 kW at 220 V.

Armament


Seydlitz mounted a nearly identical main battery to that of the preceding Moltke-class ships—ten 28 cm SK L/50 guns in five twin turrets. The guns were arranged similarly as well, with one turret fore, two staggered wing turrets, and two super-firing turrets aft. They were placed in newer Drh. L C/1910 mountings, which enabled depression of the guns down to −8 degrees and elevation to 13.5 degrees—the same range of motion of the earlier Drh. L C/1908 turrets. At 13.5 degrees, the guns could be fired to 18100 m. In 1916, as with SMS Moltke, Seydlitz had her main turrets modified to allow for elevation up to 16 degrees, for a maximum range of 19100 m. The fore and aft guns were able to train approximately 150 degrees in both directions from the centerline. The two staggered wing turrets were able to train only 80 degrees in both directions from the perpendicular. The main battery was supplied with 87 armored piercing rounds per gun, for a total of 870 shells. In addition to the 666 lb shell, each gun chambered a 57 lb fore propellant charge in a silk bag and a 174 lb main charge in a brass case. The guns fired the shells at a muzzle velocity of 2887 ft per second.

Seydlitz carried a similar secondary battery to the preceding Moltke-class design. The ship mounted twelve 15 cm SK L/45 quick-firing guns in single casemates along the center of the ship. These guns could hit targets out to a distance of 13500 m, and after the 1916 refit, the range was extended to 16800 m. The 15 cm guns had a total of 1,920 shells, with 160 rounds for each gun. The ship was also armed with twelve 8.8 cm SK L/45 quick-firing guns, which were mounted in casemates as well. Two of these guns were removed in 1916 and replaced with high-angle 8.8 cm Flak L/45 guns. As was customary for all German capital ships of the time, Seydlitz was equipped with four submerged torpedo tubes. The ship mounted one tube in the bow, one in the stern, and two on the sides of the vessel. The weapons were 50 cm in diameter, and a total of 11 torpedoes were stored.

Armor
As was standard for German warships of the period, Seydlitz used Krupp cemented and nickel steel for its armor plating. The ship had an armored belt that was 300 mm thick at its strongest area in the citadel, and tapered down to 100 mm in the bow and stern. The main belt was reinforced by a torpedo bulkhead that was 50 mm thick. The forward conning tower had 350 mm of armor on the sides, and a 200 mm thick roof. The turrets were protected by 250 mm on the sides and armor ranging in thickness from 70 – on the turret roofs. The casemates had lighter armor protection, with 150 mm on the sides and 35 mm roofs. The deck armor ranged in thickness, depending on the area being protected. In the more vital areas, the deck armor was 80 mm thick, while less important areas of the ship were covered by only 30 mm. A 50 mm belt of sloping armor was placed under the main deck armor. The turret barbettes were protected by plating 230 mm thick. The portions of the barbettes that were behind the main belt were thinner to save weight, which was a practice employed on most German and British ships of the period.

Service history


Seydlitz was launched on 30 March 1912, and was christened by General der Kavallerie von Kleist. On 22 May 1913 the ship was commissioned into the German fleet, manned by the crew of the old armored cruiser SMS Yorck, which had been recently transferred to the reserve fleet. After trials, Seydlitz joined the rest of the High Seas Fleet for maneuvers off Helgoland. Rear Admiral Franz von Hipper, the commander of the I Scouting Group, raised his flag in the ship on 23 June 1914. The ship served as Hipper's flagship until 26 October 1917.

Battle of Heligoland Bight
Shortly after the outbreak of World War I, a brief engagement between German light cruisers and a raiding force of British cruisers and battlecruisers took place on 28 August 1914. During the morning, British cruisers from the Harwich Force attacked the German destroyers patrolling the Heligoland Bight. Six German light cruisers—SMS Cöln, SMS Strassburg, SMS Stettin, SMS Frauenlob, SMS Stralsund, and SMS Ariadne—responded to the attack and inflicted serious damage to the British raiders. The arrival at approximately 13:37 of the British 1st Battlecruiser Squadron, under the command of Vice Admiral David Beatty, quickly put the German ships at a disadvantage.

Along with the rest of the I Scouting Group battlecruisers, Seydlitz was stationed in the Wilhelmshaven Roads on the morning of the battle. By 08:50, Rear Admiral Hipper had requested permission from Admiral Friedrich von Ingenohl, the commander in chief of the High Seas Fleet, to send his ships to relieve the beleaguered German cruisers. The battlecruisers SMS Von der Tann and SMS Moltke were ready to sail by 12:10, but the low tide prevented the ships from being able to pass over the sand bar at the mouth of the Jade Estuary safely. At 14:10, Moltke and Von der Tann were able to cross the Jade bar; Hipper ordered the German light cruisers to fall back to his ships, while Hipper himself was about an hour behind in Seydlitz. At 14:25, the remaining light cruisers—Strassburg, Stettin, Frauenlob, Stralsund, and Ariadne—rendezvoused with the battlecruisers. Seydlitz arrived on the scene by 15:10, while Ariadne succumbed to battle damage and sank. Hipper ventured forth cautiously to search for the two missing light cruisers, SMS Mainz and SMS Cöln (1909), which had already sunk. By 16:00, the German flotilla turned around to return to the Jade Estuary, arriving at approximately 20:23.

Bombardment of Yarmouth
On 2 November 1914, Seydlitz, followed by Moltke, Von der Tann, and the armored cruiser SMS Blücher, along with four light cruisers, left the Jade Estuary and steamed towards the English coast. The flotilla arrived off Great Yarmouth at daybreak the following morning and bombarded the port, while the light cruiser SMS Stralsund laid a minefield. The British submarine HMS D5 responded to the bombardment, but struck one of the mines laid by Stralsund and sank. Shortly thereafter, Hipper ordered his ships to turn back to German waters. While Hipper's ships were returning to German waters, a heavy fog covered the Heligoland Bight, so the ships were ordered to halt until visibility improved so they could safely navigate the defensive minefields. The armored cruiser SMS Yorck made a navigational error that led the ship into one of the German minefields. Yorck struck two mines and quickly sank; the coastal defense ship SMS Hagen was able to save 127 men of the crew.

Bombardment of Scarborough, Hartlepool, and Whitby
Admiral von Ingenohl decided that another raid on the English coast should to be carried out in the hopes of luring a portion of the Grand Fleet into combat where it could be destroyed. At 03:20 on 15 December, Seydlitz, Moltke, Von der Tann, the new battlecruiser SMS Derfflinger, and SMS Blücher, along with the light cruisers Kolberg, Strassburg, Stralsund, and Graudenz, and two squadrons of torpedo boats left the Jade. The ships sailed north past the island of Heligoland, until they reached the Horns Reef lighthouse, at which point the ships turned west towards Scarborough. Twelve hours after Hipper left the Jade, the High Seas Fleet, consisting of 14 dreadnoughts and 8 pre-dreadnoughts and a screening force of 2 armored cruisers, 7 light cruisers, and 54 torpedo boats, departed to provide distant cover.



On 26 August 1914, the German light cruiser SMS Magdeburg had run aground in the Gulf of Finland; 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. These documents were then passed on to the Royal Navy. Room 40 began decrypting German signals, and on 14 December, intercepted messages relating to the plan to bombard Scarborough. The exact details of the plan were unknown, and it was assumed that the High Seas Fleet would remain safely in port, as in the previous bombardment. Vice Admiral Beatty's 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. Seydlitz, Moltke, and Blücher went north to shell Hartlepool, while Von der Tann and Derfflinger went south to shell Scarborough and Whitby. During the bombardment of Hartlepool, Seydlitz was hit three times and Blücher was hit six times by the coastal battery. Seydlitz suffered only minimal damage, and no casualties. By 09:45 on the 16th, the two groups had reassembled, and they began to retreat eastward.



By this time, Beatty's battlecruisers were in position to block Hipper's chosen egress 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, but the battlecruisers were some 50 km 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. This confusion allowed the German light cruisers to escape and alerted Hipper to the location of the British battlecruisers. The German battlecruisers wheeled to the northeast of the British forces and made good their escape.

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. The captain of the Moltke was furious; he stated that Ingenohl had turned back "because he was afraid of eleven 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, it became known that British ships were conducting reconnaissance in the Dogger Bank area. 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 were able to deduce that Hipper would be conducting an operation in the Dogger Bank area. To counter it, Beatty's 1st Battlecruiser Squadron, Rear Admiral Archibald Moore's 2nd Battlecruiser Squadron and Commodore William Goodenough's 2nd Light Cruiser Squadron were to rendezvous with Commodore Reginald Tyrwhitt's Harwich Force at 8:00 on 24 January, approximately 30 mi north of the Dogger Bank.

At 08:14, Kolberg spotted the light cruiser HMS Aurora (1913) 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 kn, which was the maximum speed of the older armored cruiser Blücher. The pursuing British battlecruisers were steaming at 27 kn, and quickly caught up to the German ships. At 09:52, HMS Lion (1910) opened fire on Blücher from a range of approximately 20000 yd; shortly thereafter, HMS Queen Mary and HMS Tiger (1913) 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 18000 yd. 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, HMS New Zealand (1911), the fourth ship in Beatty's line, came within range of Blücher and opened fire. By 10:35, the range had closed to 17500 yd, 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. Confusion aboard Tiger led the captain to believe he was to fire on Seydlitz, which left Moltke able to fire without distraction.

Seydlitz was struck in her forecastle at 10:25, by a 13.5 in shell from Lion, but this hit did minor damage. At 10:40, Lion hit Seydlitz with a single 13.5 in (343 mm) shell, which holed the deck and penetrated the rear barbette. The shell itself failed to enter the barbette, but the explosion flashed into the working chamber and detonated the propellant charges inside.

"In the reloading chamber, where the shell penetrated, part of the charge in readiness for loading was set on fire. The flames rose high up into the turret and down into the ammunition chamber, and thence through a connecting door, usually kept shut, through which men from the ammunition chamber tried to escape into the fore turret. The flames thus made their way through to the other ammunition chamber and thence up to the second turret, and from this cause the entire guns' crews of both turrets perished very quickly. The flames rose above the turrets as high as a house."

The explosion killed 159 men, and destroyed both of the rear turrets. The fire was prevented from spreading to the shell magazines, which could have destroyed the ship, by the quick action of the executive officer, who ordered both magazines be flooded. The Pumpenmeister Wilhelm Heidkamp was severely injured when he turned the red-hot valves to flood the magazines. At 11:01, Seydlitz struck back at Lion, and with a single 28 cm shell, knocked out two of Lion's engines. Shortly thereafter, a pair of 30.5 cm shells fired by Derfflinger struck Lion, one at the waterline. The penetration allowed water to enter the port feed tank—this hit eventually crippled Lion, the sea water contamination forced the ship's crew to shut down the port engine. At 11:25, Seydlitz was struck on her armored belt amidships by a third and final shell, which did little damage.

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, Lion's 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. By the time Beatty regained control over his ships, after having boarded Princess Royal, the German ships had too far a lead for the British to catch them; at 13:50, he broke off the chase.

Seydlitz was repaired at the Kaiserliche Werft in Wilhelmshaven from 25 January to 31 March 1915, after which she rejoined the fleet.

Battle of the Gulf of Riga
On 3 August 1915, Seydlitz, Moltke, and Von der Tann were transferred to the Baltic with I Reconnaissance Group (AG) to participate in a planned foray into the Riga Gulf. The intention was to destroy the Russian naval forces in the area, including the pre-dreadnought RUSSIAN BATTLESHIP Slava, and to use the minelayer SMS Deutschland (1914) to block the entrance to Moon Sound with naval mines. The German forces, under the command of Vice Admiral Hipper, included the four and four s, the battlecruisers Seydlitz, Moltke, and Von der Tann, and a number of smaller craft. Throughout the operation, Seydlitz and the other two battlecruisers remained in the Baltic and provided cover for the assault into the Gulf of Riga.

Following the operation, Seydlitz and the other heavy units of the High Seas Fleet returned to the North Sea. On 11–12 September, Seydlitz and the rest of the I Scouting Group covered a minefield laying operation off Terschelling. On 24 November, the ship ran aground in the Kaiser Wilhelm Canal, but was quickly refloated. On 4 December, while exiting the Kaiser Wilhelm Canal, Seydlitz became entangled in one of the net barriers. Divers had to remove the tangled nets from the starboard screws.

Bombardment of Yarmouth and Lowestoft
On 24–25 April 1916, the I Scouting Group undertook another operation to bombard the English coast, this time, the towns of Yarmouth and Lowestoft. Hipper was on sick leave, so the German ships were under the command of Konteradmiral Friedrich Bödicker, who flew his flag in Seydlitz. The German battlecruisers Derfflinger, SMS Lützow, Moltke, Seydlitz and Von der Tann left the Jade Estuary at 10:55 on 24 April, and were supported by a screening force of 6 light cruisers and two torpedo boat flotillas. The heavy units of the High Seas Fleet 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 signals, and deployed the Grand Fleet at 15:50.

By 14:00, Bödicker's ships had reached a position off Norderney, at which point he turned his ships northward to avoid the Dutch observers on the island of Terschelling. At 15:38, Seydlitz struck a naval mine, which tore a 15 m (50-foot) hole in her hull, just abaft of the starboard broadside torpedo tube. 11 men were killed and 1400 ST of water entered the ship. The ship's draft increased 1.4 m at the bow of the ship. Seydlitz turned back with the screen of light cruisers at a speed of 15 kn. 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 SMS V28 brought Bödicker to Lützow, and the operation continued as planned. After Bödicker departed the ship, Seydlitz, escorted by a pair of torpedo boats, withdrew southward to the Jade. She was out of service for over a month for repair work due to the mine damage.

Battle of Jutland


Almost immediately after the Lowestoft raid, Admiral Reinhard Scheer 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. On May 22, the Wilhelmshaven dockyard reported the ship to be fit for duty, but tests carried out that night showed that the broadside torpedo flat that had been damaged by the mine was still not watertight, and there were still leaks in the fore and aft transverse bulkheads. Further repairs were necessary, and so the operation was postponed another week, by which time the Wilhelmshaven dockyard assured Scheer that the ship would be ready. At noon on 28 May, the repairs to Seydlitz were finally completed, and the ship returned to the I Scouting Group.

On the night of 30 May 1916, Seydlitz and the other four battlecruisers of the I Scouting Group lay in anchor in the Jade roadstead. The following morning, at 02:00 CET, the ships slowly steamed out towards the Skagerrak at a speed of 16 kn. By this time, Hipper had transferred his flag from Seydlitz to the newer battlecruiser Lützow. Seydlitz took her place in the center of the line, to the rear of Derfflinger and ahead of Moltke. The II Scouting Group, consisting of the light cruisers SMS Frankfurt, Rear Admiral Bödicker's flagship, SMS Wiesbaden, SMS Pillau, and SMS Elbing, 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 left the Jade; the force was composed of 16 dreadnoughts. The High Seas Fleet was accompanied by the IV Scouting Group, composed of the light cruisers SMS Stettin, SMS München, SMS Hamburg, SMS Frauenlob, and SMS Stuttgart, 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 5:00.

Shortly before 16:00, Hipper's force encountered Vice Admiral Beatty's battlecruiser squadron. The German ships were the first to open fire, at a range of approximately 15000 yards. 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. As the two lines of battlecruisers deployed to engage each other, Seydlitz began to duel with her opposite in the British line, HMS Queen Mary. By 16:54, the range between the ships decreased to 12900 yards, which enabled Seydlitz's secondary battery to enter the fray. She was close enough to the ships of the British 9th and 10th Destroyer Flotillas that her secondary guns could effectively engage them. The other four German battlecruisers employed their secondary battery against the British battlecruisers.

Between 16:55 and 16:57, Seydlitz was struck by two heavy caliber shells from Queen Mary. The first shell penetrated the side of the ship five feet above the main battery deck, and caused a number of small fires. The second shell penetrated the barbette of the aft superfiring turret. Four propellant charges were ignited in the working chamber; the resulting fire flashed up into the turret and down to the magazine. The anti-flash precautions that had been put in place after the explosion at Dogger Bank prevented any further propellant explosions. Regardless, the turret was destroyed and most of the gun crew had been killed in the blaze.



By 17:25, the British battlecruisers were taking a severe battering from their German opponents. HMS Indefatigable (1909) had been destroyed by a salvo from Von der Tann approximately 20 minutes before, and Beatty sought to turn his ships away by 2 points in order to regroup, while the s of the 5th Battle Squadron arrived on the scene and provided covering fire. As the British battlecruisers began to turn away, Seydlitz and Derfflinger were able to concentrate their fire on Queen Mary. Witnesses reported at least 5 shells from two salvos hit the ship, which caused an intense explosion that ripped the Queen Mary in half. Shortly after the destruction of Queen Mary, both British and German destroyers attempted to make torpedo attacks on the opposing lines. One British torpedo struck Seydlitz at 17:57. The torpedo hit the ship directly below the fore turret, slightly aft of where she had been mined the month before. The explosion tore a hole 40 feet long by 13 feet wide (12 m × 4.0 m), and caused a slight list. Despite the damage, the ship was still able to maintain her top speed, and kept position in the line.

The leading ships of the German battle fleet had by 18:00 come within effective range of the British ships, and had begun trading shots with the British battlecruisers and Queen Elizabeth-class battleships. Between 18:09 and 18:19, Seydlitz was hit by a 380 mm shell from either HMS Barham (04) or HMS Valiant (1914). This shell struck the face of the port wing turret and disabled the guns. A second 380 mm shell penetrated the already disabled aft superfiring turret and detonated the cordite charges that had not already burned. The ship also had two of her 150 mm guns disabled from British gunfire, and the rear turret lost its right-hand gun.

As the evening wore on, visibility steadily decreased for the German ships. Seydlitz's commander, Kapitän zur See von Egidy, later remarked:

""Visibility had generally become unfavorable. There was a dense mist, so that as a rule only the flashes of the enemy's guns, but not the ships themselves, could be seen. Our distance had been reduced from 18,000 to 13,000 yards. From north-west to north-east we had before us a hostile line firing its guns, though in the mist we could only glimpse the flashes from time to time. It was a mighty and terrible spectacle.""

At around 19:00, Beatty's forces were nearing the main body of the Grand Fleet, and to delay the discovery of the Grand Fleet's location by the German fleet, he turned his ships towards the German line, in order to force them to turn as well. This reduced the distance between the British and German battlecruisers from 14000 to 12000 yards. Visibility continued to favor the British, and the German battlecruisers paid the price. Over the next several minutes, Seydlitz was hit six times, primarily on the forward section of the ship. A fire started under the ship's forecastle. The smothering fire from Beatty's ships forced Hipper to temporarily withdraw his battlecruisers to the southwest. As the ships withdrew, Seydlitz began taking on more water, and the list to starboard worsened. The ship was thoroughly flooded above the middle deck in the fore compartments, and had nearly lost all buoyancy.

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, while using his dreadnoughts and battlecruisers to cover their retreat 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.

Seydlitz and the other battlecruisers followed the move, 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 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 Seydlitz, Von der Tann, Moltke, and Derfflinger 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 HMS Colossus (1910), at which point Scheer directed the ships to engage the lead ship of the British line. Seydlitz managed to hit Colossus once, but caused only minor damage to the ship's superstructure. Three minutes later, the German battlecruisers turned in retreat, covered by a torpedo boat attack.



A pause in the battle at dusk allowed Seydlitz 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 ready 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 20:20. In the ensuing melee, Seydlitz was hit several times; one shell struck the rear gun turret and other hit the ship's bridge. The entire bridge crew was killed and several men in the conning tower were wounded. 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 behind the battlecruisers, and prevented the British ships from pursuing the German battlecruisers 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.

By 22:15, Hipper was finally able to transfer to Moltke, and then ordered his ships to steam at 20 kn towards the head of the German line. Only Seydlitz and Moltke were in condition to comply; Derfflinger and Von der Tann could make at most 18 knots, and so these ships lagged behind. Seydlitz and Moltke were in the process of steaming to the front of the line when the ships passed close to Stettin, which forced the ship to drastically slow down to avoid collision. This forced Frauenlob, Stuttgart, and München to turn to port, which led them into contact with the 2nd Light Cruiser Squadron; at a range of 800 yards, the cruisers on both sides pummeled each other. Rear Admiral Ludwig von Reuter decided to attempt to lure the British cruisers towards Moltke and Seydlitz. Nearly simultaneously, the heavily damaged British cruisers broke off the attack. As the light cruisers were disengaging, a torpedo fired by HMS Southampton (1912) struck Frauenlob, and the ship exploded. The German formation fell into disarray, and in the confusion, Seydlitz lost sight of Moltke. The ship was no longer able to keep up with Moltke's 22 knots, and so detached herself to proceed to the Horns Reef lighthouse independently.

At 00:45, Seydlitz was attempting to thread her way through the British fleet, but was sighted by the dreadnought HMS Agincourt (1913) and noted as a "ship or Destroyer". Agincourt's captain did not want to risk giving away his ship's position, and so allowed her to pass. By 01:12, Seydlitz had managed to slip through the British fleet, and she was able to head for the safety of Horns Reef. At approximately 03:40, she scraped over Horns Reef. Both of the ship's gyro-compasses had failed, so the light cruiser SMS Pillau was sent to guide the ship home. By 15:30 on 1 June, Seydlitz was in critical condition; the bow was nearly completely submerged, and the only buoyancy that remained in the forward section of the ship was the broadside torpedo room. Preparations were being made to evacuate the wounded crew when a pair of pump steamers arrived on the scene. The ships were able to stabilize Seydlitz's flooding, and the ship managed to limp back to port. She reached the outer Jade river on the morning of 2 June, and on 3 June the ship entered Entrance III of the Wilhelmshaven Lock. At most, Seydlitz had been flooded by 5308 t of water.



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 each had only two guns in operation, 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, Seydlitz was hit 21 times by heavy-caliber shells, twice by secondary battery shells, and once by a torpedo. The ship suffered a total of 98 of her crew killed and 55 wounded. Seydlitz herself fired 376 main battery shells and scored approximately 10 hits.

Later operations
On 15 June 1916, repair work to Seydlitz began in the Imperial Dockyard in Wilhelmshaven, and continued until 1 October. The ship then underwent individual training, and rejoined the fleet in November. With his previous flagship Lützow at the bottom of the North Sea, Admiral Hipper again raised his flag in Seydlitz. On 4 November, Seydlitz and Moltke, along with the II Division, I Battle Squadron, the III Battle Squadron, and the new battleship SMS Bayern sailed to Bovbjerg on the Danish coast, in order to retrieve the stranded U-boats SMU U-20 (Germany) and SMU U-30 (Germany).

Late 1917 saw the High Seas Fleet beginning to conduct anti-convoy raids in the North Sea between Britain and Norway. In October and December 1917, two British convoys to Norway were intercepted and destroyed by German cruisers and destroyers, prompting Beatty, now the Commander in Chief of the Grand Fleet, to detach several battleships and battlecruisers to protect convoys. 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


Seydlitz 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 their base in Wilhelmshaven to engage the British Grand Fleet; Scheer—by now the Großadmiral 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 Von der Tann and Derfflinger 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. Many of the war-weary sailors felt the operation would disrupt the peace process and prolong the war. Starting on the night of 29 October, sailors on several battleships mutinied; three ships from the III Squadron refused to weigh anchors, and acts of sabotage were committed on board the battleships SMS Thüringen and SMS Helgoland. The unrest ultimately forced Hipper and Scheer to cancel the operation. Informed of the situation, the Kaiser stated "I no longer have a navy." The Wilhelmshaven mutiny spread to Kiel, and fueled a larger German Revolution that continued after the end of the war. Germany's military position was hopeless, and so Generals Paul von Hindenburg and Erich Ludendorff convinced the government to sign the Armistice to end the war.

Following the capitulation of Germany in November 1918, most of the High Seas Fleet, under the command of Rear Admiral Ludwig von Reuter, were interned in the British naval base in Scapa Flow. Prior to the departure of the German fleet, Admiral Adolf von Trotha made clear to von Reuter that he could not allow the Allies to seize the ships, under any conditions. The fleet rendezvoused with the British light cruiser HMS Cardiff (D58), which led the ships to the Allied fleet that was to escort the Germans to Scapa Flow. The massive flotilla consisted of some 370 British, American, and French warships. Once the ships were interned, their guns were disabled through the removal of their breech blocks, and their crews were reduced to 200 officers and men.

The fleet remained in captivity during the negotiations that ultimately produced the Treaty of Versailles. Von Reuter believed that the British intended to seize the German ships on 21 June 1919, which was the deadline for Germany to have signed the peace treaty. Unaware that the deadline had been extended to the 23rd, Reuter ordered the ships to be sunk at the next opportunity. On the morning of 21 June, the British fleet left Scapa Flow to conduct training maneuvers, and at 11:20 Reuter transmitted the order to his ships. Seydlitz slipped beneath the surface at 13:50. On her side and on the bottom in twelve fathoms of water the wreck was frequently mistaken for a small island, and was sold in this condition as scrap to the salvage firm of Cox and Danks along with a battleship and twenty-six destroyers. The ship was raised on 2 November 1928, and while still inverted was towed south to be scrapped in Rosyth by 1930. Seydlitz's bell is on display at the Laboe Naval Memorial.