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21 Cm Kanone 39
The 21 cm Kanone 39 (K 39) was a Czech-designed heavy gun used by the Germans in the Second World War. Two were built before the Germans occupied Czechoslovakia in March 1939 and seized the rest of the guns and kept it in production for their own use, eventually building a total of 60 guns for themselves. They saw action in Operation Barbarossa, the siege of Odessa, siege of Leningrad and the siege of Sevastopol and were used on coast defence duties. Development and design It was designed by Škoda as a dual-purpose heavy field and coast defence gun in the late 1930s for Turkey with the designation of ''K52''. Only two had been delivered before the rest of the production run was appropriated by the Heer upon the occupation of Czechoslovakia in March 1939.Gander and Chamberlain, p. 206 Unlike the German practice of sliding block breeches that required a metallic cartridge case to seal the gun's chamber against combustion gases, Škoda preferred to use an interrupted scr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siege Gun
Siege artillery (also siege guns or siege cannons) are heavy guns designed to bombard fortifications, cities, and other fixed targets. They are distinct from field artillery and are a class of siege weapon capable of firing heavy cannonballs or shells that required enormous transport and logistical support to operate. They lacked mobility and thus were rarely useful in more mobile warfare situations, generally having been superseded by heavy howitzers (towed and self-propelled artillery), strategic bomber aircraft, surface-to-surface missiles, ballistic missiles, cruise missiles and multiple rocket launchers in modern warfare. Muzzle-loading artillery Breech-loading artillery {, class="wikitable sortable" style="font-size:100%;" ! width=15% , Caliber (mm) ! width=35% , Weapon name ! width=25% , Country of origin ! width=25% , Design , - , 88 , , 9 cm Kanone C/79 , , , , 1879– World War I , - , 107 , , 42-line siege gun M1877 , , , , Russo-Japanese War , - , ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Army (Wehrmacht)
The German Army (, "army") is the land component of the armed forces of Federal Republic of Germany, Germany. The present-day German Army was founded in 1955 as part of the newly formed West German ''Bundeswehr'' together with the German Navy, ''Marine'' (German Navy) and the German Air Force, ''Luftwaffe'' (German Air Force). , the German Army had a strength of 62,766 soldiers. History Overview A German army equipped, organized, and trained following a single doctrine and permanently unified under one command in 1871 during the unification of Germany under the leadership of Prussia. From 1871 to 1919, the title ''German Army (German Empire), Deutsches Heer'' (German Army) was the official name of the German land forces. Following the German defeat in World War I and the end of the German Empire, the main army was dissolved. From 1921 to 1935 the name of the German land forces was the ''Reichswehr, Reichsheer'' (Army of the Empire) and from 1935 to 1945 the name ''German Army (We ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Army Group North
Army Group North (german: Heeresgruppe Nord) was a German strategic formation, commanding a grouping of field armies during World War II. The German Army Group was subordinated to the ''Oberkommando des Heeres'' (OKH), the German army high command, and coordinated the operations of attached separate army corps, reserve formations, rear services and logistics, including the Army Group North Rear Area. Operational history The Army Group North was created on the 2 September 1939 by reorganization of the 2nd Army Headquarters. Commander in Chief as of 27 August 1939 was Field Marshal Fedor von Bock. Invasion of Poland The first employment of Army Group North was in the invasion of Poland of 1939, where in September it controlled: * 3rd Army * 4th Army * a reserve of four divisions ** 10th Panzer Division ** 73rd Infantry Division ** 206th Infantry Division ** 208th Infantry Division. The Army Group was commanded by Fedor von Bock for the operation. After the end of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Army Group Center
Army Group Centre (german: Heeresgruppe Mitte) was the name of two distinct strategic German Army Groups that fought on the Eastern Front in World War II. The first Army Group Centre was created on 22 June 1941, as one of three German Army formations assigned to the invasion of the Soviet Union (Operation Barbarossa). On 25 January 1945, after it was encircled in the Königsberg pocket, Army Group Centre was renamed Army Group North (), and Army Group A () became Army Group Centre. The latter formation retained its name until the end of the war in Europe on 11 May after VE Day. Formation The commander in chief on the formation of the Army Group Centre (22 June 1941) was Fedor von Bock. Order of battle at formation Campaign and operational history Operation Barbarossa On 22 June 1941, Nazi Germany and its Axis allies launched their surprise offensive into the Soviet Union. Their armies, totaling over three million men, were to advance in three geographical directi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
4th Army (Wehrmacht)
The 4th Army () was a field army of the Wehrmacht during World War II. Invasions of Poland and France The 4th Army was activated on 1 August 1939 with General Günther von Kluge in command. It took part in the Invasion of Poland of September 1939 as part of Army Group North, which was under Field Marshal Feodor von Bock. The 4th Army contained the II Corps and III Corps, each with two infantry divisions, the XIX Corps with two motorized and one panzer divisions, and three other divisions, including two in reserve. Its objective was to capture the Polish Corridor, thus linking mainland Germany with East Prussia. During the attack on the Low Countries and France, the 4th Army, as part of Field Marshal Gerd von Rundstedt's Army Group A, invaded Belgium from the Rhineland. Along with other German armies, the 4th Army penetrated the Dyle Line and completed the trapping of the Allied forces in France. The then Major-General Erwin Rommel, who was under Kluge, contributed immensely ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Army Group South
Army Group South (german: Heeresgruppe Süd) was the name of three German Army Groups during World War II. It was first used in the 1939 September Campaign, along with Army Group North to invade Poland. In the invasion of Poland Army Group South was led by Gerd von Rundstedt and his chief of staff Erich von Manstein. Two years later, Army Group South became one of three army groups into which Germany organised their forces for Operation Barbarossa. Army Group South's principal objective was to capture Soviet Ukraine and its capital Kiev. In September 1944, the Army Group South Ukraine was renamed Army Group South in Eastern Hungary. It fought in Western Hungary until March 1945 and retired to Austria at the end of the Second World War, where it was renamed Army Group Ostmark on 2 April 1945. Operation Barbarossa Ukraine was a major center of Soviet industry and mining and had the good farmland required for Hitler's plans for ''Lebensraum'' ('living space'). Army Group South ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
6th Army (Wehrmacht)
The 6th Army was a field army unit of the German Wehrmacht during World War II (1939–1945). It was widely remembered for being the most highly decorated German army unit until its defeat by the Red Army at the Battle of Stalingrad in the winter of 1942–1943. It also acquired a reputation for the war crimes (such as the massacre of more than 30,000 Jews at Babi Yar in September 1941) that it committed under the command of Field Marshal Walther von Reichenau during Operation Barbarossa. Western campaigns Originally numbered as the 10th Army, this Army formed on 10 October 1939 with General Walther von Reichenau in command. Its primary mission was to guard the western defenses of Germany against British and French attacks during the Polish campaign. During the invasion of the Low Countries the 6th Army saw active service linking up with paratroopers and destroying fortifications at Eben Emael, Liège, and Namur during the Battle of Belgium. The 6th Army was then involved in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PETN
Pentaerythritol tetranitrate (PETN), also known as PENT, PENTA, (ПЕНТА, primarily in Russian) TEN, corpent, or penthrite (or, rarely and primarily in German, as nitropenta), is an explosive material. It is the nitrate ester of pentaerythritol, and is structurally very similar to nitroglycerin. Penta refers to the five carbon atoms of the neopentane skeleton. PETN is a very powerful explosive material with a relative effectiveness factor of 1.66. When mixed with a plasticizer, PETN forms a plastic explosive. Along with RDX it is the main ingredient of Semtex. PETN is also used as a vasodilator drug to treat certain heart conditions, such as for management of angina. History Pentaerythritol tetranitrate was first prepared and patented in 1894 by the explosives manufacturer Rheinisch-Westfälische Sprengstoff A.G. of Cologne, Germany. The production of PETN started in 1912, when the improved method of production was patented by the German government. PETN was used by the Germ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Armor-piercing Shot And Shell
Armour-piercing ammunition (AP) is a type of projectile designed to penetrate either body armour or vehicle armour. From the 1860s to 1950s, a major application of armour-piercing projectiles was to defeat the thick armour carried on many warships and cause damage to their lightly-armoured interiors. From the 1920s onwards, armour-piercing weapons were required for anti-tank warfare. AP rounds smaller than 20 mm are intended for lightly-armoured targets such as body armour, bulletproof glass, and lightly-armoured vehicles. As tank armour improved during World War II, anti-vehicle rounds began to use a smaller but dense penetrating body within a larger shell, firing at very high muzzle velocity. Modern penetrators are long rods of dense material like tungsten or depleted uranium (DU) that further improve the terminal ballistics. History The late 1850s saw the development of the ironclad warship, which carried wrought iron armour of considerable thickness. This armour ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Driving Band
Russian 122 mm shrapnel shell, which has been fired, showing rifling marks on the copper driving band around its base and the steel bourrelet nearer the front A driving band or rotating band is a band of soft metal near the base of an artillery shell, often made of gilding metal, copper, or lead. When the shell is fired, the pressure of the propellant swages the metal into the rifling of the barrel and forms a seal; this seal prevents the gases from blowing past the shell, and engages the barrel's rifling to spin-stabilize the shell. Purpose The rotating band has three essential functions: * Center the rear end of the projectile in the gun barrel. * Seal the bore to prevent burning powder gas from moving through the rifling grooves past the projectile. * Engage with the rifling of the barrel to spin the projectile and stabilize its flight. Characteristics The shell is stabilized for yaw in the barrel by a smaller bourrelet band near the front of the projectile. This band ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-explosive
An explosive (or explosive material) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An explosive charge is a measured quantity of explosive material, which may either be composed solely of one ingredient or be a mixture containing at least two substances. The potential energy stored in an explosive material may, for example, be * chemical energy, such as nitroglycerin or grain dust * pressurized gas, such as a gas cylinder, aerosol can, or BLEVE * nuclear energy, such as in the fissile isotopes uranium-235 and plutonium-239 Explosive materials may be categorized by the speed at which they expand. Materials that detonate (the front of the chemical reaction moves faster through the material than the speed of sound) are said to be "high explosives" and materials that deflagrate are said to be "low explosives". Explosives may also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ball Bearing
A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. It achieves this by using at least two races to contain the balls and transmit the loads through the balls. In most applications, one race is stationary and the other is attached to the rotating assembly (e.g., a hub or shaft). As one of the bearing races rotates it causes the balls to rotate as well. Because the balls are rolling they have a much lower coefficient of friction than if two flat surfaces were sliding against each other. Ball bearings tend to have lower load capacity for their size than other kinds of rolling-element bearings due to the smaller contact area between the balls and races. However, they can tolerate some misalignment of the inner and outer races. History Although bearings had been developed since ancient times, the first mod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
