Oscarsborg Fortress is best known for sinking the  German heavy cruiser named for the Prussian victor of what?
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Oscarsborg Fortress Oscarsborg Fortress (Norwegian: Oscarsborg festning ) is a coastal fortress in the Oslofjord, close to the small town of Drøbak. The best known part is situated on two small islets. The main artillery batteries are on the island Håøya and smaller batteries on the mainland to the west and east in the fjord and was military territory until 2003 when it was made a publicly available resort island. The fortress is best known for sinking the German heavy cruiser "Blücher" on 9 April 1940. In 2014, Oscarsborg Fortress was given protected status, effective from 9 April that year.
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German cruiser Blücher Blücher was the second of five "Admiral Hipper"-class heavy cruisers of Nazi Germany's "Kriegsmarine", built after the rise of the Nazi Party and the repudiation of the Treaty of Versailles. Named for Gebhard Leberecht von Blücher, the Prussian victor of the Battle of Waterloo, the ship was laid down in August 1936 and launched in June 1937. She was completed in September 1939, shortly after the outbreak of World War II. After completing a series of sea trials and training exercises, the ship was pronounced ready for service with the fleet on 5 April 1940.
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Hans von Koester Hans Ludwig Raimund von Koester (29 April 1844 – 21 February 1928) was a German naval officer who served in the Prussian Navy and later in the Imperial German Navy. He retired as a Grand Admiral.
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Ludwig von Reuter Ludwig von Reuter (9 February 1869 – 18 December 1943) 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.
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Leopold Siemens Leopold Siemens (17 May 1889 - 7 December 1979) was a Vice admiral in the Kriegsmarine during World War II. He served as captain of the cruiser "Karlsruhe" in the mid 1930s and held the short lived position of Deputy fleet commander of the German Navy ("2. Admiral der Flotte") in 1941.
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SMS Delphin SMS "Delphin" was a "Camäleon"-class gunboat of the Prussian Navy (later the Imperial German Navy) that was launched in 1860. A small vessel, armed with only three light guns, "Delphin" served during the Second Schleswig War of 1864 and the Austro-Prussian War of 1866, part of the conflicts that unified Germany. The ship was present at, but was only lightly engaged in the Battle of Jasmund during the Second Schleswig War. The ship spent much of the rest of her career in the Mediterranean Sea, going on three lengthy deployments there in 1865–1866, 1867–1870, and 1871–1873. During the last tour, she took part in operations off the coast of Spain with an Anglo-German squadron during the Third Carlist War, where she helped to suppress forces rebelling against the Spanish government. For the rest of the 1870s, she served as a survey vessel in the North and Baltic Seas before being decommissioned in August 1881, stricken from the naval register the following month, and subsequently broken up for scrap.
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Hubert Edward Dannreuther Rear-Admiral Hubert Edward Dannreuther, DSO (12 December 1880 – 12 August 1977) was a British admiral and one of six survivors of the sinking of HMS "Invincible" during the battle of Jutland.
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SMS Deutschland (1874) SMS "Deutschland"  was the second and final ship of the "Kaiser"-class ironclad s; SMS "Kaiser" was her sister ship. Named for Germany ("Deutschland" in German), the ship was laid down in the Samuda Brothers shipyard in London in 1872. The ship was launched in September 1874 and commissioned into the German fleet in July 1875. "Deutschland" mounted a main battery of eight 26 cm guns in a central battery amidships. She was the last capital ship built for the German Navy by a foreign ship-builder; all subsequent ships were built in Germany.
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Henning von Holtzendorff Henning von Holtzendorff (January 9, 1853 – June 7, 1919) was a German admiral during World War I, who became famous for his December 1916 memo about unrestricted submarine warfare against the United Kingdom. He was a recipient of Order of the Black Eagle and the Pour le Mérite with oak leaves and was one of just six Grand Admirals of the Imperial German Navy.
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SMS Kaiser (1858) SMS "Kaiser" was a 92-gun wooden ship of the line of the Austrian Navy, the last vessel of the type, and the only screw-driven example, to be built by the Austrians. She was built by the naval shipyard in Pola; she was laid down in March 1855, was launched in October 1858, and was completed the following year. The ship took part in the Second Schleswig War of 1864, but saw no action during her deployment to the North Sea. "Kaiser" did see action during the Seven Weeks' War two years later, during which she took part in the Battle of Lissa as the flagship of Anton von Petz, commander of the Austrian 2nd Division. "Kaiser" engaged several Italian ironclads simultaneously, rammed one—"Re di Portogallo" —and damaged another—"Affondatore" —with gunfire. In doing so, she became the only wooden ship of the line to engage an ironclad warship in battle.
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USS Borie (DD-215) The USS "Borie" (DD-215) was a "Clemson"-class destroyer in the United States Navy during World War II. She was the first ship named for Ulysses S. Grant's Secretary of the Navy, Adolph E. Borie. She served in the Black Sea, the Asiatic Fleet and the Caribbean between the wars, and in the Battle of the Atlantic, the long campaign to protect Allied shipping from German U-boats during World War II. As part of the antisubmarine Hunter-killer Group unit Task Group 21.14, the crew earned a Presidential Unit Citation for its "extraordinary performance." The "Borie" also earned distinction in her final battle with "U-405" in November 1943, and was sunk by friendly forces due to damage sustained by ramming the surfaced U-boat and engaging her crew with small arms fire.
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Hansjürgen Reinicke Hans-Jürgen "Hansjürgen" Rudolf Reinicke (10 August 1902 – 29 January 1978) was a "Kapitän zur See", commander of heavy cruiser "Prinz Eugen", in Nazi Germany's "Kriegsmarine" during the Second World War and recipient of the Knight's Cross of the Iron Cross.
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HMS Prince Albert (1864) HMS "Prince Albert" was designed and built as a shallow-draught coast-defence ship, and was the first British warship designed to carry her main armament in turrets. The ship was named after Prince Albert, the late husband of Queen Victoria. At her wish "Prince Albert" remained on the "active" list until 1899, a total of 33 years, by which time she had long ceased to be of any military value.
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SMS Vineta Two ships of the Imperial German Navy, and one of the Prussian Navy, have borne the name SMS "Vineta", named after the mythic city of Vineta :
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SMS Schleswig-Holstein SMS "Schleswig-Holstein" (] ) was the last of the five "Deutschland"-class battleship s built by the German Kaiserliche Marine. The ship, named for the province of Schleswig-Holstein, was laid down in the Germaniawerft dockyard in Kiel in August 1905 and commissioned into the fleet nearly three years later. The ships of her class were already outdated by the time they entered service, being inferior in size, armor, firepower and speed to the new generation of dreadnought battleships.
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Sinking of SS Kaiser Wilhelm der Grosse The Battle of Río de Oro was a single-ship action fought in August 1914 during the First World War. The British protected cruiser HMS "Highflyer" attacked the German auxiliary cruiser  off the small Spanish Saharan territory of Río de Oro.
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Russian cruiser Pallada (1906) Pallada (Russian: Паллада) was the last of the four "Bayan"-class armored cruisers built for the Imperial Russian Navy in the first decade of the 20th century. She was assigned to the Baltic Fleet during World War I where she captured codebooks from the German cruiser "Magdeburg" that had run aground during the first month of the war. The ship was torpedoed by a German submarine in October 1914 and exploded; none of the crew survived. "Pallada" was the first warship lost by the Russians during the war.
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Battle of the Denmark Strait The Battle of the Denmark Strait was a naval engagement on 24 May 1941 in the Second World War, between ships of the Royal Navy and the German "Kriegsmarine". The British battleship HMS "Prince of Wales" and the battlecruiser HMS "Hood" fought the German battleship "Bismarck" and the heavy cruiser "Prinz Eugen" , which were attempting to break out into the North Atlantic to attack Allied merchant shipping (Operation Rheinübung).
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SMS Panther (1885) SMS "Panther" was a torpedo cruiser ("Torpedoschiff") of the Austro-Hungarian Navy. She and her sister ship, "Leopard" were part of a program to build up Austria-Hungary's fleet of torpedo craft in the 1880s. She was the lead ship of her class, and was built in Britain by Armstrong, from her keel laying in October 1884 to her completion in December 1885. She was armed with a battery of two 12 cm guns and ten 47 mm guns, along with four 356 mm torpedo tubes.
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Otto von Schrader Otto von Schrader (18 March 1888 – 19 July 1945) was a German Admiral during World War II and a recipient of the Knight's Cross of the Iron Cross of Nazi Germany. As a U boat commander during World War I he was credited with the sinking of 57 ships for a total of  gross register tons (GRT) , a further 6 ships damaged for a total of  GRT , including  , and one ship taken as prize for a total of  GRT . Schrader was taken prisoner of war in Norway at the end of World war II. He committed suicide in Norwegian captivity on 19 July 1945.
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Sink the Bismarck (disambiguation) The "Bismarck" was a battleship of the German navy during World War II, named after Otto von Bismarck.
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SMS König SMS "König" was the first of four "König"-class dreadnought battleships of the Imperial German Navy ("Kaiserliche Marine") during World War I. "König" (Eng: "King") was named in honor of King William II of Württemberg. Laid down in October 1911, the ship was launched on 1 March 1913. Final construction on "König" was completed shortly after the outbreak of World War I; she was commissioned into the High Seas Fleet on 9 August 1914.