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U-Boot
U-boats are naval submarines operated by Germany, including during the First and Second World Wars. The term is an anglicized form of the German word , a shortening of (), though the German term refers to any submarine. Austro-Hungarian Navy submarines were also known as U-boats. U-boats are most known for their unrestricted submarine warfare in both world war A world war is an international War, conflict that involves most or all of the world's major powers. Conventionally, the term is reserved for two major international conflicts that occurred during the first half of the 20th century, World War I ...s, trying to Commerce raiding, disrupt merchant traffic towards the UK and force the UK out of the war. In World War I, Germany intermittently waged unrestricted submarine warfare against the United Kingdom, UK: a first campaign in 1915 was abandoned after strong protests from the US but in 1917 the Germans, facing deadlock on the continent, saw no other option than to re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karl Dönitz
Karl Dönitz (; 16 September 1891 – 24 December 1980) was a German grand admiral and convicted war criminal who, following Adolf Hitler's Death of Adolf Hitler, suicide, succeeded him as head of state of Nazi Germany during the Second World War in April 1945. He held the position until the dissolution of the Flensburg Government following German Instrument of Surrender, Germany's unconditional surrender to the Allies of World War II, Allies weeks later. As Oberkommando der Marine, Supreme Commander of the Navy beginning in 1943, he played a major role in the naval history of World War II, naval history of the war. He began his career in the Imperial German Navy before the First World War. In 1918 he was commanding , and was captured as a prisoner of war by British forces. As commander of ''UB-68'', he attacked a convoy in the Mediterranean while on patrol near Malta. Sinking one ship before the rest of the convoy outran his U-boat, Dönitz began to formulate the concept of U- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Battle Of The Atlantic
The Battle of the Atlantic, the longest continuous military campaign in World War II, ran from 1939 to the defeat of Nazi Germany in 1945, covering a major part of the naval history of World War II. At its core was the Allies of World War II, Allied naval Blockade of Germany (1939–1945), blockade of Germany, announced the day after the declaration of war, and Germany's subsequent counter-blockade. The campaign peaked from mid-1940 to the end of 1943. The Battle of the Atlantic pitted U-boats and other warships of the German (navy) and aircraft of the (air force) against the Royal Navy, Royal Canadian Navy, United States Navy, and Merchant Navy (United Kingdom), Allied merchant shipping. Convoys, coming mainly from North America and predominantly going to the United Kingdom and the Soviet Union, were protected for the most part by the British and Canadian navies and air forces. These forces were aided by ships and aircraft of the United States beginning on 13 September 1941. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
U995 2001 1 B
German submarine ''U-995'' is a German Type VII submarine#Type VIIC.2F41, Type VIIC/41 U-boat of Nazi Germany's ''Kriegsmarine''. She was Keel laying, laid down on 25 November 1942 by Blohm & Voss in Hamburg, Germany, and Ship commissioning, commissioned on 16 September 1943 with ''Oberleutnant zur See'' Walter Köhntopp in command. She is preserved at Laboe Naval Memorial near Kiel. Design German Type VII submarine#Type VIIC/41, German Type VIIC/41 submarines were preceded by the heavier German Type VII submarine#Type VIIC, Type VIIC submarines. ''U-995'' had a displacement of when at the surface and while submerged. She had a total length of , a pressure hull length of , a beam (nautical), beam of , a height of , and a draught (ship), draught of . The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of for use while surfaced, two Brown, Boveri & Cie GG UB 720/8 Motor–generator, double-acting electric mot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black May (1943)
Black May refers to a period (May 1943) in the Battle of the Atlantic campaign during World War II, when the German U-boat arm (''U-Bootwaffe'') suffered high casualties with fewer Allied ships sunk; it is considered a turning point in the Battle of the Atlantic. Background After February battles around convoys SC 118, ON 166, and UC 1, Black May was the culmination of the March–May 1943 crisis in the Battle of the Atlantic. March The U-boat offensive reached its peak in March, with a series of major convoy battles, first around convoys HX 228, SC 121, and UGS 6; then followed the battle for Convoy HX 229/Convoy SC 122, the largest convoy battle of the war. Allied losses for March totalled 120 ships of , of which 82 () were lost in the Atlantic. The German U-boat arm (''U-Bootwaffe'') (UBW) lost 12 U-boats during this time. Post-war, the official Royal Navy history - by Capt. Stephen Roskill - concluded, "The Germans never came so near to disrupting communications betw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Befehlshaber Der Unterseeboote
The ''Befehlshaber der Unterseeboote'' or BdU (Eng: "Commander of the U-boats") was the supreme commander of the German Navy's U-boat Arm (''Ubootwaffe'') during the First and Second World Wars. The term also referred to the Command HQ of the U-boat arm. The title was established in June 1917, replacing the role of "Leader of the U-boats" ('' Führer der Unterseeboote'', or FdU) for the High Seas Flotillas. The first incumbent was ''Kapitan zur See/Kommodore'' Andreas Michelsen, previously head of the High Seas Fleet’s destroyer force. The post was abolished with the end of the war. It was revived on 17 October 1939, when Karl Dönitz was promoted to rear admiral (''Konteradmiral''). His previous title had been FdU, a position he had held from January 1936. On 31 January 1943 Dönitz was promoted to grand admiral (''Großadmiral'') and became supreme commander (''Oberbefehlshaber der Kriegsmarine'') of the entire Kriegsmarine, replacing Erich Raeder Erich Johann Alber ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brandtaucher
''Brandtaucher'' ( German for ''Fire-diver'') was a submersible designed by the Bavarian inventor and engineer Wilhelm Bauer and built by Schweffel & Howaldt in Kiel for Schleswig-Holstein's Flotilla (part of the '' Reichsflotte'') in 1850. The ''Brandtaucher'' is the oldest known surviving submarine in the world. History In January 1850, Bauer, a cavalryman during the German-Danish War, designed ''Brandtaucher'' as a way to end the Danish naval blockade of Germany. A submarine could affix mines on hulls of enemy ships undetected, and detonate them from a safe distance. Bauer's early sketch attracted the attention of the Minister of Marine, who allowed him to construct a model. The model was demonstrated in Kiel harbour in front of naval dignitaries. Its satisfactory performance led to the construction of a full-scale model, which was funded by contributions from army personnel and local civilians. Due to the inadequate funding, the scale of the boat had to be downgraded ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Submarine
A submarine (often shortened to sub) is a watercraft capable of independent operation underwater. (It differs from a submersible, which has more limited underwater capability.) The term "submarine" is also sometimes used historically or informally to refer to remotely operated vehicles and Autonomous underwater vehicle, robots, or to medium-sized or smaller vessels (such as the midget submarine and the wet sub). Submarines are referred to as ''boats'' rather than ''ships'' regardless of their size. Although experimental submarines had been built earlier, submarine design took off during the 19th century, and submarines were adopted by several navies. They were first used widely during World War I (1914–1918), and are now used in many navy, navies, large and small. Their military uses include: attacking enemy surface ships (merchant and military) or other submarines; aircraft carrier protection; Blockade runner, blockade running; Ballistic missile submarine, nuclear deterrenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-frequency Direction Finding
High-frequency direction finding, usually known by its abbreviation HF/DF or nickname huff-duff, is a type of radio direction finder (RDF) introduced in World War II. High frequency (HF) refers to a radio band that can effectively communicate over long distances; for example, between U-boats and their land-based headquarters. HF/DF was primarily used to catch enemy radios while they transmitted, although it was also used to locate friendly aircraft as a navigation aid. The basic technique remains in use as one of the fundamental disciplines of signals intelligence, although typically incorporated into a larger suite of radio systems and radars instead of being a stand-alone system. In earlier RDF systems, the operator mechanically rotated a loop antenna or solenoid and listened for peaks or nulls in the signal to determine the bearing to the transmitter. This took considerable time, on the order of a minute or more. Radio operators could avoid being located by keeping their messag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dredging
Dredging is the excavation of material from a water environment. Possible reasons for dredging include improving existing water features; reshaping land and water features to alter drainage, navigability, and commercial use; constructing dams, dikes, and other controls for streams and shorelines; and recovering valuable mineral deposits or marine life having commercial value. In all but a few situations the excavation is undertaken by a specialist floating plant, known as a dredger. Usually the main objectives of dredging is to recover material of value, or to create a greater depth of water. Dredging systems can either be shore-based, brought to a location based on barges, or built into purpose-built vessels. Dredging can have environmental impacts: it can disturb marine sediments, creating dredge plumes which can lead to both short- and long-term water pollution, damage or destroy seabed ecosystems, and release legacy human-sourced toxins captured in the sediment. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
August Howaldt
August Ferdinand Howaldt (23 October 1809 – 4 August 1883) was a German engineer and ship builder. The German sculptor Georg Ferdinand Howaldt was his brother. Biography Born in Braunschweig, the son of the silversmith David Ferdinand Howaldt, with whom he got his first practice working in metal, Howaldt made an apprenticeship in Hamburg and became a ''practical mechanicus''. In 1838 he moved to Kiel, where he married Emma Diederichsen. In Kiel he founded together with the Kiel entrepreneur the "Maschinenbauanstalt Schweffel & Howaldt", a company initially building boilers for industry and the new railroad companies in between Hamburg and Kiel and agricultural machinery for the surrounding estates in Holstein. In 1849 Schweffel & Howaldt built its first steam engine for naval purposes for the ''Von der Tann'', a gunboat for the small navy of Schleswig-Holstein, and the '' Brandtaucher'', the first German incendiary diver or submarine designed by Wilhelm Bauer. The ''Br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilhelm Bauer
Wilhelm Bauer (; 23 December 1822 – 20 June 1875) was a German marine engineer and inventor who built several hand-powered submarines. Biography Wilhelm Bauer was born in Dillingen in the Kingdom of Bavaria. His father was a sergeant in a Bavarian cavalry regiment. After an apprenticeship as a wood turner, Bauer also joined the army. Working as an artillery engineer, he witnessed the German/Danish war for Schleswig-Holstein between 1848 and 1851. Seeing how the Prussian coast was easily blockaded by the Danish navy, Bauer quickly developed a plan to build a new type of submersible ship to help break the blockade. He began studying hydraulics and ship construction. However, before his studies could get very far, the troops of the German Confederation decided to withdraw and surrendered Schleswig-Holstein to Denmark. However, Bauer was determined to realize his plan and left the Bavarian Army to join the forces of Schleswig-Holstein. It proved very hard for Bauer, wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
