page_title: German cruiser Köln
section_title: World War II
hierarchical_section_title: German cruiser Köln / Service history / World War II
caption_attribution_description: English: The German light cruiser Köln underway with rails manned, circa 1936. Note the heraldic shield mounted on her bow and the large flag flying from her foremast peak.
context_page_description: Köln was a light cruiser, the third member of the Königsberg class that was operated between 1929 and March 1945, including service in World War II. She was operated by two German navies, the Reichsmarine and the Kriegsmarine. She had two sister ships, Königsberg and Karlsruhe. Köln was built by the Deutsche Werke shipyard in Kiel; she was laid down in August 1926, launched in May 1928, and commissioned into the Reichsmarine in 15 January 1930. She was armed with a main battery of nine 15 cm SK C/25 guns in three triple turrets and had a top speed of 32 knots.
  Like her sister ships, Köln served as a training ship for naval cadets in the 1930s, and joined the non-intervention patrols during the Spanish Civil War during the latter part of the decade. After the outbreak of World War II in September 1939, she conducted several operations in the North Sea, but did not encounter any British warships. She participated in the attack on Bergen during Operation Weserübung in April 1940, and she was the only member of her class to survive the operation. In 1942, she was modified to carry a Flettner Fl 282 helicopter experimentally.
context_section_description: In March 1939, Köln participated in the annexation of Memel which Germany had demanded from Lithuania. Later in the year, she joined the battleship Gneisenau and the heavy cruisers Deutschland, Admiral Scheer, and Admiral Graf Spee for a major series of maneuvers in the Atlantic. In the final days of August, Köln was stationed in the western Baltic to prevent Polish vessels from fleeing after the German invasion of Poland on 1 September; she was unsuccessful in this task. She thereafter joined her sister ships in laying a series of defensive minefields.
  Köln joined Gneisenau and nine destroyers for a sortie into the North Sea on 7–9 October. The goal was to draw units of the Royal Navy over a U-boat line and into range of the Luftwaffe, though it failed on both counts. The British launched an air attack consisting of 12 Wellington bombers, though it too failed to hit any of the German warships. On 20–22 November, Köln and the cruiser Leipzig escorted the battleships Gneisenau and Scharnhorst on the first leg of their sortie into the North Atlantic. On the 22nd, Köln and Leipzig were detached to join an unsuccessful patrol for Allied merchant ships in the Skagerrak along with Deutschland and three torpedo boats. The patrol lasted until 25 November, and failed to locate any Allied freighters. On 13 December, Köln, Leipzig, and Nürnberg covered the return of several destroyers that had laid an offensive minefield off Newcastle.
  Köln took part in Operation Weserübung, the invasion of Norway, in April 1940. She was assigned Group 3, tasked with the assault on Bergen, along with her sister Königsberg. She reached the harbor unscathed, but Königsberg was not so lucky; she was badly damaged by Norwegian coastal guns. Köln nevertheless supported the German infantry ashore with her main guns. After the port was secured, she returned to Germany, along with a pair of destroyers. In late 1940, she went into drydock for further modifications. A degaussing coil was installed, along with a helicopter landing platform on top of turret "Bruno". She thereafter served as a testbed for the Flettner Fl 282 helicopter, a task she performed until 1942.
  While still conducting experiments with the FI 282 in September 1941, Köln provided gunfire support to ground troops attacking Soviet positions on Dagö in the Gulf of Riga. She also bombarded Soviet positions on Ristna. She joined the battleship Tirpitz, Admiral Scheer, Nürnberg, and several destroyers and torpedo boats formed the Baltic Fleet, which was intended to block any Soviet warships from fleeing the eastern Baltic. No Soviet vessels attempted to do so, however. On 13 July, the Soviet submarine Shch-322 tried to attack Köln, but the cruiser's escorts forced the Soviet submarine to break off the attack.
  Toward the end of 1941, she was transferred to the North Sea, and went into drydock for her last major modification. This consisted of the installation of a FuMO 21 radar set on the forward command center roof. In July 1942, Köln departed Germany to join the growing naval presence in Norway, though she saw no major action there. On 13 September, she and the heavy cruisers Admiral Scheer and Admiral Hipper and two destroyers attempted to attack Convoy PQ 18. While en route from Narvik to Altenfjord, the flotilla was attacked by the British submarine HMS Tigris, but the torpedoes passed behind the German ships. The convoy was instead attacked by U-boats and long-range bombers, which sank thirteen freighters. She returned to Germany in January 1943, where she was decommissioned in Kiel on 17 February. She was sent to drydock in early 1944 for an overhaul to prepare her to return to combat duty; this was completed by 1 July. The cruiser served briefly as a training ship before escorting German merchant vessels in Norway. While en route from Kristiansand on 7 July, the ship laid a defensive minefield in the Skagerrak. She and three destroyers laid another minefield on 14–15 July, before steaming to Trondheim.
  On the night of 13–14 December, Köln was attacked by British bombers in Oslofjord; seve
caption: Köln circa 1936
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