SMS Karlsruhe
SMS  was a light cruiser of the  built by the German  (Imperial Navy). She had one sister ship, ; the ships were very similar to the previous s. The ship was laid down in 1911, launched in November 1912, and completed by January 1914. Armed with twelve 10.5 cm SK L/45 guns,  had a top speed of , which allowed her to escape from British cruisers during her career. After her commissioning,  was assigned to overseas duties in the Caribbean. She arrived in the area in July 1914, days before the outbreak of World War I. Once the war began, she armed the passenger liner , but while the ships were transferring equipment, British ships located them and pursued . Her superior speed allowed her to escape, after which she operated off the northeastern coast of Brazil. Here, she captured or sank sixteen ships. While en route to attack the shipping lanes to Barbados on 4 November 1914, a spontaneous internal explosion destroyed the ship and killed the majority of the crew. The survivors used one of s colliers to return to Germany in December 1914. Design

 was  long overall and had a beam of  and a draft of  forward. She displaced  at full load. Her propulsion system consisted of two sets of Marine steam turbines driving two  propellers. They were designed to give , but reached  in service. These were powered by twelve coal-fired Marine-type water-tube boilers and two oil-fired double-ended boilers. These gave the ship a top speed of . carried  of coal, and an additional  of fuel oil that gave her a range of approximately  at . had a crew of 18 officers and 355 enlisted men. The ship was armed with a main battery of twelve  SK L/45 guns in single pedestal mounts. Two were placed side by side forward on the forecastle, eight were located amidships, four on either side, and two were side by side aft. The guns had a maximum elevation of 30 degrees, which allowed them to engage targets out to . They were supplied with 1,800 rounds of ammunition, for 150 shells per gun. She was also equipped with a pair of  torpedo tubes with five torpedoes submerged in the hull on the broadside. She could also carry 120 mines. The ship was protected by a waterline armored belt that was  thick amidships. The conning tower had  thick sides, and the deck was covered with up to 60 mm thick armor plate. Service history

 was ordered under the contract name " " and was laid down at the Germaniawerft shipyard in Kiel on 21 September 1911. She was christened by Karl Siegrist, the mayor of Karlsruhe, and launched on 11 November 1912, after which fitting-out work commenced. Builder's trials began in mid-December 1913, followed by full sea trials with the navy, which revealed that the ship consumed coal at a prodigious rate. She was commissioned into the High Seas Fleet on 15 January 1914. s first commanding officer was  (FK—Frigate Captain) Fritz Lüdecke. Following her commissioning in January 1914,  conducted further trials that lasted until June. She then returned to the yard for modifications in an unsuccessful attempt to improve the situation. The navy intended to send  to the East American Station, where she was to replace the light cruiser , but owing to the delays in her completion, the cruiser  was sent instead. Once  was ready, she departed Kiel on 14 June. On 1 July,  reached Saint Thomas in the Danish West Indies; there the ship received news of the assassination of Archduke Franz Ferdinand and his wife in Sarajevo three days before. The ship then proceeded to Port-au-Prince, Haiti to protect German nationals during a period of civil unrest in the city from 5 to 9 July. was then scheduled to meet  in Veracruz, Mexico, but further unrest in Haiti forced the cancellation of the meeting. On 27 July,  and  finally met and exchanged commanders. FK Erich Köhler came aboard  and Lüdecke was to take  back to Germany, though this was not to be carried out. was to have gone to Veracruz and then to the opening ceremonies of the Panama Canal, but Köhler decided against this since the July Crisis over Ferdinand's assassination was at its peak, and there were numerous British and French warships already present for the celebration. Instead, he took his ship to Havana, Cuba, where he remained for two days. On 30 July,  left the port, initially keeping close to shore before proceeding to the isolated Cay Sal Bank in the Straits of Florida in an attempt to evade any observers. To throw any pursuers off his trail, Köhler broadcast a message in the open that he intended to call at Tampico, Mexico on 4 August. The British armored cruiser  was in the area, and Köhler had the opportunity to arm the passenger ship  as an auxiliary cruiser in the event of war, so  steamed east into the open Atlantic Ocean. World War I

On the night of 3/4 August,  received word of the state of war between Germany and France, and the greatly increased risk of conflict with Britain. s standing orders in the event of war were to conduct a commerce raiding campaign against British merchant traffic. was still present in the region at the outbreak of World War I at the end of July, which complicated the British attempt to hunt down the German cruisers. To hunt down , , and any merchant ships she might arm as auxiliary cruisers, the Royal Navy deployed five cruiser squadrons, the most powerful were those commanded by Rear Admiral Christopher Craddock and Rear Admiral Archibald Stoddart. The British were forced to disperse their ships to cover the areas in which the two German cruisers, and any auxiliary cruisers they might arm, could operate. On 6 August,  rendezvoused with  about  north of Watling Island. was in the process of transferring guns and equipment to the liner when Craddock, in his flagship , appeared to the south. The Germans had only managed to transfer two 8.8 cm guns, a machine gun, and some sailors by the time Suffolk arrived. The two ships quickly departed in different directions; Suffolk followed  and other cruisers were ordered to intercept her. s faster speed allowed her to quickly outpace Craddock, but at 20:15,  joined the pursuit and briefly fired on the German cruiser. The German gunners scored two hits on Bristol during the short engagement, forcing the latter to slow down. turned east and again used her high speed to evade the British ships. The British failed to relocate her, and by 9 August,  reached Puerto Rico with only 12 tons of coal in her bunkers. There, she coaled from a HAPAG freighter in the port before departing for the coast of Brazil, since merchant traffic was heavier there. The area was also not as heavily patrolled by the British. While on the way,  stopped in Willemstad in Curaçao to take on more coal and oil. After reaching the northern coast of Brazil, she sank her first British steamship on 18 August. Over the course of 21–23 August, the ship went to Maraca island south of the mouth of the Amazon river to replenish her coal stocks from a German steamship. The German prewar plans had arranged for German merchant vessels to act as colliers to support commerce raiding cruisers by operating in neutral waters at pre-planned meeting points. The voraciousness of s boilers nevertheless significantly reduced her radius of action. In addition to making use of German colliers, Köhler frequently took coal from the ships he captured. He also kept one or two prizes to assist in the search for targets. patrolled the eastern coast of South America, as far south as La Plata, Argentina; in the course of these operations, she sank or captured at least sixteen merchant ships. These merchantmen, fifteen British ships and one Dutch vessel, totaled . Köhler then decided to move to another area, as remaining in one area would increase his chances of being tracked down by the British. He turned his ship toward the West Indies to attack Barbados and Fort-de-France and the shipping lanes between Barbados and Trinidad. As  steamed to Barbados on the night of 4 November, a spontaneous internal explosion destroyed the ship at approximately 18:30. The hull was split in half; the bow section quickly sank and took with it Köhler and most of the crew. The stern remained afloat long enough for 146 of the ship's crew to escape onto the attending colliers, the Hamburg Süd liner  and the captured British steamer . At 18:57, the stern also sank. Commander Studt, the senior surviving officer, took charge and placed all of his men aboard Rio Negro. He scuttled Indrani and steamed north for Iceland. The ship used the cover of a major storm to slip through the British blockade of the North Sea, and put in at Ålesund, Norway. Rio Negro then returned to Germany on 6 December. The , unaware of the loss of , coincidentally radioed the ship to order her to return to Germany. Germany kept the loss of the ship a secret, and the British continued searching for her until they learned of her fate in March 1915. As a result, eleven British cruisers were tied up, searching for the cruiser, for almost six months after she had been destroyed. Köhler's widow christened the cruiser , the third to bear the name, at her launching in August 1927. Notes

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Further reading
 

Karlsruhe-class cruisers
Ships built in Kiel
1912 ships
World War I cruisers of Germany
World War I commerce raiders
World War I shipwrecks in the Caribbean Sea
Ships sunk by non-combat internal explosions
Maritime incidents in November 1914