1.
Howitzer
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In the taxonomies of artillery pieces used by European armies in the 17th to 20th centuries, the howitzer stood between the gun and the mortar. Howitzers, like other artillery equipment, are organized in groups called batteries. The English word howitzer comes from the Czech word houfnice, from houf, crowd, haufen, sometimes in the compound Gewalthaufen, also designated a pike square formation in German. This is particularly true in the forces of the United States. Because of this practice, the howitzer is used in some armies as a generic term for any kind of artillery piece that is designed to attack targets using indirect fire. Thus, artillery pieces that bear resemblance to howitzers of earlier eras are now described as howitzers. Most other armies in the reserve the word howitzer for guns with barrel lengths 15 to 25 times their caliber. The British had a method of nomenclature. In the 18th century, they adopted projectile weight for guns replacing the old naming system of culverin, saker, mortars had been categorized by calibre in inches in the 17th century and this was inherited by howitzers. The modern howitzers were invented in Sweden towards the end of the 17th century, originally intended for use in siege warfare, they were particularly useful for delivering cast-iron shells filled with gunpowder or incendiary materials into the interior of fortifications. In the middle of the 18th century, a number of European armies began to introduce howitzers that were enough to accompany armies in the field. Though usually fired at the high angles of fire used by contemporary siege howitzers. Rather, as the guns of the day were usually restricted to inert projectiles. Many, for the sake of simplicity and rapidity of fire, the Abus gun was an early form of howitzer in the Ottoman Empire. In 1758 the Russian Empire introduced a type of howitzer, with a conical chamber, called a licorne. The most famous of these gun-howitzers was the Napoleon 12-pounder, a weapon of French design that saw service in the American Civil War. The longest-serving artillery piece of the 19th century was the mountain howitzer, in 1859, the armies of Europe began to rearm field batteries with rifled field guns. These new field pieces used cylindrical projectiles that, while smaller in caliber than the spherical shells of smoothbore field howitzers, moreover, their greater range let them create many of the same effects that previously required the sharply curved trajectories of smoothbore field howitzers
2.
World War II
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World War II, also known as the Second World War, was a global war that lasted from 1939 to 1945, although related conflicts began earlier. It involved the vast majority of the worlds countries—including all of the great powers—eventually forming two opposing alliances, the Allies and the Axis. It was the most widespread war in history, and directly involved more than 100 million people from over 30 countries. Marked by mass deaths of civilians, including the Holocaust and the bombing of industrial and population centres. These made World War II the deadliest conflict in human history, from late 1939 to early 1941, in a series of campaigns and treaties, Germany conquered or controlled much of continental Europe, and formed the Axis alliance with Italy and Japan. Under the Molotov–Ribbentrop Pact of August 1939, Germany and the Soviet Union partitioned and annexed territories of their European neighbours, Poland, Finland, Romania and the Baltic states. In December 1941, Japan attacked the United States and European colonies in the Pacific Ocean, and quickly conquered much of the Western Pacific. The Axis advance halted in 1942 when Japan lost the critical Battle of Midway, near Hawaii, in 1944, the Western Allies invaded German-occupied France, while the Soviet Union regained all of its territorial losses and invaded Germany and its allies. During 1944 and 1945 the Japanese suffered major reverses in mainland Asia in South Central China and Burma, while the Allies crippled the Japanese Navy, thus ended the war in Asia, cementing the total victory of the Allies. World War II altered the political alignment and social structure of the world, the United Nations was established to foster international co-operation and prevent future conflicts. The victorious great powers—the United States, the Soviet Union, China, the United Kingdom, the Soviet Union and the United States emerged as rival superpowers, setting the stage for the Cold War, which lasted for the next 46 years. Meanwhile, the influence of European great powers waned, while the decolonisation of Asia, most countries whose industries had been damaged moved towards economic recovery. Political integration, especially in Europe, emerged as an effort to end pre-war enmities, the start of the war in Europe is generally held to be 1 September 1939, beginning with the German invasion of Poland, Britain and France declared war on Germany two days later. The dates for the beginning of war in the Pacific include the start of the Second Sino-Japanese War on 7 July 1937, or even the Japanese invasion of Manchuria on 19 September 1931. Others follow the British historian A. J. P. Taylor, who held that the Sino-Japanese War and war in Europe and its colonies occurred simultaneously and this article uses the conventional dating. Other starting dates sometimes used for World War II include the Italian invasion of Abyssinia on 3 October 1935. The British historian Antony Beevor views the beginning of World War II as the Battles of Khalkhin Gol fought between Japan and the forces of Mongolia and the Soviet Union from May to September 1939, the exact date of the wars end is also not universally agreed upon. It was generally accepted at the time that the war ended with the armistice of 14 August 1945, rather than the formal surrender of Japan
3.
Korean War
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The Korean War began when North Korea invaded South Korea. The United Nations, with the United States as the principal force, China came to the aid of North Korea, and the Soviet Union gave some assistance. Korea was ruled by Japan from 1910 until the days of World War II. In August 1945, the Soviet Union declared war on Japan, as a result of an agreement with the United States, U. S. forces subsequently moved into the south. By 1948, as a product of the Cold War between the Soviet Union and the United States, Korea was split into two regions, with separate governments, both governments claimed to be the legitimate government of all of Korea, and neither side accepted the border as permanent. The conflict escalated into open warfare when North Korean forces—supported by the Soviet Union, on that day, the United Nations Security Council recognized this North Korean act as invasion and called for an immediate ceasefire. On 27 June, the Security Council adopted S/RES/83, Complaint of aggression upon the Republic of Korea and decided the formation, twenty-one countries of the United Nations eventually contributed to the UN force, with the United States providing 88% of the UNs military personnel. After the first two months of war, South Korean forces were on the point of defeat, forced back to the Pusan Perimeter, in September 1950, an amphibious UN counter-offensive was launched at Inchon, and cut off many North Korean troops. Those who escaped envelopment and capture were rapidly forced back north all the way to the border with China at the Yalu River, at this point, in October 1950, Chinese forces crossed the Yalu and entered the war. Chinese intervention triggered a retreat of UN forces which continued until mid-1951, after these reversals of fortune, which saw Seoul change hands four times, the last two years of fighting became a war of attrition, with the front line close to the 38th parallel. The war in the air, however, was never a stalemate, North Korea was subject to a massive bombing campaign. Jet fighters confronted each other in combat for the first time in history. The fighting ended on 27 July 1953, when an armistice was signed, the agreement created the Korean Demilitarized Zone to separate North and South Korea, and allowed the return of prisoners. However, no treaty has been signed, and the two Koreas are technically still at war. Periodic clashes, many of which are deadly, continue to the present, in the U. S. the war was initially described by President Harry S. Truman as a police action as it was an undeclared military action, conducted under the auspices of the United Nations. In South Korea, the war is referred to as 625 or the 6–2–5 Upheaval. In North Korea, the war is referred to as the Fatherland Liberation War or alternatively the Chosǒn War. In China, the war is called the War to Resist U. S
4.
First Indochina War
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The First Indochina War began in French Indochina on 19 December 1946 and lasted until 1 August 1954. Fighting between French forces and their Viet Minh opponents in the South dated from September 1945, Japanese forces located south of that line surrendered to him and those to the north surrendered to Generalissimo Chiang Kai-shek. In September 1945, Chinese forces entered Tonkin and a small British task force landed at Saigon, the Chinese accepted the Vietnamese government under Ho Chi Minh, then in power in Hanoi. The British refused to do likewise in Saigon, and deferred to the French there from the outset, on V-J Day, September 2, Ho Chi Minh had proclaimed in Hanoi the establishment of the Democratic Republic of Vietnam. On 23 September 1945, with the knowledge of the British Commander in Saigon, French forces overthrew the local DRV government, guerrilla warfare began around Saigon immediately. The first few years of the war involved a low-level rural insurgency against the French, French Union forces included colonial troops from the whole former empire, French professional troops and units of the French Foreign Legion. The use of metropolitan recruits was forbidden by the government to prevent the war from becoming more unpopular at home. It was called the dirty war by leftists in France, the strategy of pushing the Viet Minh into attacking well-defended bases in remote parts of the country at the end of their logistical trails was validated at the Battle of Nà Sản. However, this base was relatively weak because of a lack of concrete and this combination proved fatal for this base defenses, culminating in a decisive French defeat at the Battle of Dien Bien Phu. The south continued under Emperor Bảo Đại, a year later, Bảo Đại would be deposed by his prime minister, Ngô Đình Diệm, creating the Republic of Vietnam. Soon an insurgency, backed by the North, developed against Diệms government, the conflict gradually escalated into the Vietnam War. Vietnam was absorbed into French Indochina in stages between 1858 and 1887, nationalism grew until World War II provided a break in French control. Early Vietnamese resistance centered on the intellectual Phan Bội Châu, Châu looked to Japan, which had modernized and was one of the few Asian nations to successfully resist European colonization. With Prince Cường Để, Châu started two organizations in Japan, the Duy Tân hội and Vietnam Cong Hien Hoi, due to French pressure, Japan deported Phan Bội Châu to China. Witnessing Sun Yat-sens 1911 nationalist revolution, Châu was inspired to commence the Viet Nam Quang Phục Hội movement in Guangzhou, from 1914 to 1917, he was imprisoned by Yuan Shikais counterrevolutionary government. In 1925, he was captured by French agents in Shanghai, due to his popularity, Châu was spared from execution and placed under house arrest until his death in 1940. In September 1940, shortly after Phan Bội Châus death, Japan launched its invasion of French Indochina, keeping the French colonial administration, the Japanese ruled from behind the scenes in a parallel of Vichy France. As far as Vietnamese nationalists were concerned, this was a double-puppet government, Emperor Bảo Đại collaborated with the Japanese, just as he had with the French, ensuring his lifestyle could continue
5.
Vietnam War
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It was the second of the Indochina Wars and was officially fought between North Vietnam and the government of South Vietnam. The war is considered a Cold War-era proxy war. As the war continued, the actions of the Viet Cong decreased as the role. U. S. and South Vietnamese forces relied on air superiority and overwhelming firepower to conduct search and destroy operations, involving ground forces, artillery, in the course of the war, the U. S. conducted a large-scale strategic bombing campaign against North Vietnam. The North Vietnamese government and the Viet Cong were fighting to reunify Vietnam and they viewed the conflict as a colonial war and a continuation of the First Indochina War against forces from France and later on the United States. The U. S. government viewed its involvement in the war as a way to prevent a communist takeover of South Vietnam and this was part the domino theory of a wider containment policy, with the stated aim of stopping the spread of communism. Beginning in 1950, American military advisors arrived in what was then French Indochina, U. S. involvement escalated in the early 1960s, with troop levels tripling in 1961 and again in 1962. Regular U. S. combat units were deployed beginning in 1965, despite the Paris Peace Accord, which was signed by all parties in January 1973, the fighting continued. In the U. S. and the Western world, a large anti-Vietnam War movement developed as part of a larger counterculture, the war changed the dynamics between the Eastern and Western Blocs, and altered North–South relations. Direct U. S. military involvement ended on 15 August 1973, the capture of Saigon by the North Vietnamese Army in April 1975 marked the end of the war, and North and South Vietnam were reunified the following year. The war exacted a huge human cost in terms of fatalities, estimates of the number of Vietnamese soldiers and civilians killed vary from 966,000 to 3.8 million. Some 240, 000–300,000 Cambodians,20, 000–62,000 Laotians, and 58,220 U. S. service members died in the conflict. Various names have applied to the conflict. Vietnam War is the most commonly used name in English and it has also been called the Second Indochina War and the Vietnam Conflict. As there have been several conflicts in Indochina, this conflict is known by the names of its primary protagonists to distinguish it from others. In Vietnamese, the war is known as Kháng chiến chống Mỹ. It is also called Chiến tranh Việt Nam, France began its conquest of Indochina in the late 1850s, and completed pacification by 1893. The 1884 Treaty of Huế formed the basis for French colonial rule in Vietnam for the seven decades
6.
Rock Island Arsenal
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The Rock Island Arsenal comprises 946 acres, located on Arsenal Island, originally known as Rock Island, on the Mississippi River between the cities of Davenport, Iowa, and Rock Island, Illinois. It lies within the state of Illinois and it is home of First Army headquarters. The island was established as a government site in 1816. It is now the largest government-owned weapons manufacturing arsenal in the United States and it has manufactured military equipment and ordnance since the 1880s. In 1919–1920 one hundred of the Anglo-American or Liberty Mark VIII tanks were manufactured and it is designated as a National Historic Landmark. Established as both an arsenal and a center for the manufacture of leather accoutrements and field gear, today it provides manufacturing, logistics, the Arsenal is the only active U. S. Some of the Arsenals most successful products include the M198 and M119 towed howitzers, about 250 military personnel and 6,000 civilians work there. The 2000 census population was 145, from the autobiography of Black Hawk, When we arrived we found that the troops had come to build a fort on Rock Island. It was our garden, like the people have near their big villages. The island facilities were converted and built in 1863, they were not yet completed in December of that year, the first prisoners were 468 Confederates captured in battles at Chattanooga, Tennessee. That month more than 5,000 Confederates would swell the population of Rock Island military prison and they were kept in 84 barracks, each holding around 100 prisoners. A total of 41 Confederate prisoners successfully escaped during the prison’s operation, most died from disease, since sanitation was primitive as in all army encampments, and exposure to heat and humidity during the summers and freezing temperatures during winters. In 1864, deadly smallpox epidemics raged through the prison, the prison camp operated from December 1863 until July 1865, when the last prisoners were freed. After the war, the facility was completely destroyed. During its two years in operation, the camp housed a total of more than 12,400 Confederates. Following the war, the government retained ownership of Arsenal Island and developed it for use as an arsenal and ordnance manufacturing center. The Rock Island Arsenal Museum was established on July 4,1905 and it is the second-oldest US Army Museum in the US after the West Point Museum. The museum has been closed twice, during World War I and World War II, exhibits interpret the history of Rock Island Arsenal and the Union prison camp during the American Civil War, and the sites role as a military industrial facility
7.
Gun barrel
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A gun barrel is a part of firearms and artillery pieces. The hollow interior of the barrel is called the bore, a gun barrel must be able to hold in the expanding gas produced by the propellants to ensure that optimum muzzle velocity is attained by the projectile as it is being pushed out by the expanding gas. Modern small arms barrels are made of known and tested to withstand the pressures involved. Artillery pieces are made by various techniques providing reliably sufficient strength, early firearms were muzzle-loading, with powder, and then shot loaded from the muzzle, capable of only a low rate of fire. During the 19th century effective mechanical locks were invented that sealed a breech-loading weapon against the escape of propellant gases, the early Chinese, the inventors of gunpowder, used bamboo, a naturally tubular stalk, as the first barrels in gunpowder projectile weapons. Early European guns were made of iron, usually with several strengthening bands of the metal wrapped around circular wrought iron rings. The Chinese were the first to master cast-iron cannon barrels, early cannon barrels were very thick for their caliber. Bore evacuator Bore snake Cannon Muzzle Polygonal rifling Rifling Slug barrel Smoothbore
8.
Shell (projectile)
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A shell is a payload-carrying projectile that, as opposed to shot, contains an explosive or other filling, though modern usage sometimes includes large solid projectiles properly termed shot. Solid shot may contain a pyrotechnic compound if a tracer or spotting charge is used, originally, it was called a bombshell, but shell has come to be unambiguous in a military context. Words cognate with grenade are still used for an artillery or mortar projectile in some European languages, shells are usually large-calibre projectiles fired by artillery, combat vehicles, and warships. Shells usually have the shape of a cylinder topped by a nose for good aerodynamic performance, possibly with a tapering base. Solid cannonballs did not need a fuse, but hollow munitions filled with something such as gunpowder to fragment the ball, needed a fuse, percussion fuses with a spherical projectile presented a challenge because there was no way of ensuring that the impact mechanism hit the target. Therefore, shells needed a fuse that was ignited before or during firing. The earliest record of shells being used in combat was by the Republic of Venice at Jadra in 1376, shells with fuses were used at the 1421 siege of St Boniface in Corsica. These were two hollowed hemispheres of stone or bronze held together by an iron hoop, as described in their book, these hollow, gunpowder-packed shells were made of cast iron. At least since the 16th Century grenades made of ceramics or glass were in use in Central Europe, a hoard of several hundred ceramic greandes were discovered during building works in front of a bastion of the Bavarian City of Ingolstadt, Germany dated to the 17th Century. Lots of the grenades obtained their orignal blackpowder loads and igniters, most probably the grenades were intentionally dumped the moat of the bastion before the year 1723. Early powder burning fuses had to be loaded fuse down to be ignited by firing or a portfire put down the barrel to light the fuse, other shells were wrapped in bitumen cloth, which would ignite during the firing and in turn ignite a powder fuse. Nevertheless, shells came into use in the 16th Century. By the 18th Century, it was known that the fuse towards the muzzle could be lit by the flash through the windage between the shell and the barrel, the use of exploding shells from field artillery became relatively commonplace from early in the 19th century. Until the mid 19th century, shells remained as simple exploding spheres that used gunpowder and they were usually made of cast iron, but bronze, lead, brass and even glass shell casings were experimented with. The word bomb encompassed them at the time, as heard in the lyrics of The Star-Spangled Banner, typically, the thickness of the metal body was about a sixth of their diameter and they were about two thirds the weight of solid shot of the same calibre. To ensure that shells were loaded with their fuses towards the muzzle, in 1819, a committee of British artillery officers recognised that they were essential stores and in 1830 Britain standardised sabot thickness as a half inch. The sabot was also intended to reduce jamming during loading, despite the use of exploding shell, the use of smoothbore cannons, firing spherical projectiles of shot, remained the dominant artillery method until the 1850s. By the late 18th century, artillery could use canister shot to defend itself from infantry or cavalry attack and this involved loading a tin or canvas container filled with small iron or lead balls instead of the usual cannonball
9.
Caliber
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In guns, particularly firearms, caliber or calibre is the approximate internal diameter of the barrel, or the diameter of the projectile it fires, in hundredths or sometimes thousandths of an inch. For example, a 45 caliber firearm has a diameter of.45 of an inch. Barrel diameters can also be expressed using metric dimensions, as in 9mm pistol, when the barrel diameter is given in inches, the abbreviation cal can be used. Good performance requires a bullet to closely match the diameter of a barrel to ensure a good seal. While modern cartridges and cartridge firearms are referred to by the cartridge name. Firearm calibers outside the range of 17 to 50 exist, but are rarely encountered. Larger calibers, such as.577.585.600.700, the.950 JDJ is the only known cartridge beyond 79 caliber used in a rifle. Referring to artillery, caliber is used to describe the length as multiples of the bore diameter. A 5-inch 50 calibre gun has a diameter of 5 in. The main guns of the USS Missouri are 1650 caliber, makers of early cartridge arms had to invent methods of naming the cartridges, since no established convention existed then. One of the early established cartridge arms was the Spencer repeating rifle, later various derivatives were created using the same basic cartridge, but with smaller-diameter bullets, these were named by the cartridge diameter at the base and mouth. The original No.56 became the. 56-56, and the smaller versions. 56-52. 56-50, the. 56-52, the most common of the new calibers, used a 50-cal bullet. Optionally, the weight in grains was designated, e. g. 45-70-405. Variations on these methods persist today, with new cartridges such as the.204 Ruger, metric diameters for small arms refer to cartridge dimensions and are expressed with an × between the bore diameter and the length of the cartridge case, for example,7. 62×51 NATO. This indicates that the diameter is 7. 62mm, loaded in a case 51mm long. Similarly, the 6. 5×55 Swedish cartridge has a diameter of 6.5 mm. An exception to rule is the proprietary cartridge used by U. S. maker Lazzeroni. The following table lists commonly used calibers where both metric and imperial are used as equivalents
10.
Breech-loading weapon
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A breech-loading gun is a firearm in which the cartridge or shell is inserted or loaded into a chamber integral to the rear portion of a barrel. Modern mass production firearms are breech-loading, early firearms, on the other hand, were almost entirely muzzle-loading. In field artillery, breech loading allows the crew to reload the gun without exposing themselves to fire or repositioning the piece. The main challenge for developers of breech-loading firearms was sealing the breech and this was eventually solved for smaller firearms by the development of the self-contained metallic cartridge. For firearms too large to use cartridges, the problem was solved by the development of the interrupted screw, breech-loading swivel guns were invented in the 14th century. The breech-loading swivel gun had a rate of fire, and was especially effective in anti-personnel roles. Breech-loading firearms are known from the 16th century, Henry VIII possessed one, which he apparently used as a hunting gun to shoot birds. More breech-loading firearms were made in the early 18th century, one such gun known to have belonged to Philip V of Spain, and was manufactured circa 1715, probably in Madrid. It came with a ready-to load reusable cartridge, patrick Ferguson, a British Army officer, developed in 1772 the Ferguson rifle, a breech-loading flintlock firearm. Later on into the century there were attempts in Europe at an effective breech-loader. There were concentrated attempts at improved cartridges and methods of ignition, the cartridge was loaded through the breech and fired with a needle. The needle-activated central-fire breech-loading gun would become a feature of firearms thereafter. The corresponding firearm was also developed by Pauly, Pauly made an improved version, which was protected by a patent on 29 September 1812. In 1846 another Paris Frenchman, Benjamin Houllier, patented the first fully metallic cartridge containing powder in a metallic shell, Houllier commercialised his weapons in association with the gunsmiths Blanchard or Charles Robert. In English-speaking countries the Flobert cartridge corresponds to the.22 BB, the first centrefire cartridge was introduced in 1855 by Pottet, with both Berdan and Boxer priming. The Dreyse Zündnadelgewehr or Dreyse needle gun, was a single-shot breech-loading rifle using a rotating bolt to seal the breech and it was so called because of its. 5-inch needle-like firing pin, which passed through a paper cartridge case to impact a percussion cap at the bullet base. It began development in the 1830s under von Dreyse and eventually a version of it was adopted by Prussia in the late 1840s. The paper cartridge and the gun had numerous deficiencies, specifically, however, the rifle was used to great success in the Prussian army in the Austro-Prussian war of 1866
11.
Rifled breech loader
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The spin imparted by the guns rifling gives projectiles directional stability and increased range. Loading from the rear of the gun leaves the crew exposed to enemy fire, allows smaller gun emplacements or turrets. This was both a safety issue and one of gun performance - all the propellant gas was needed to accelerate the projectile along the barrel. The second problem was speed of operation - how to close the breech before firing, two solutions were developed more or less in parallel, the screw breech block and sliding wedge or sliding block. Hence, unlike with a rifle cartridge, the breech mechanism itself somehow needed to provide obturation. Hence if the block circumference was divided into two sets of threads and gaps, the only needed to be rotated ¼ turn to lock it instead of several turns. The tradeoff was that only ½ the blocks circumference was threaded, until the 19th century, only muzzle-loaders were used. In 1837 Martin von Wahrendorff patented a design for a breech-loader with a cylindrical breech plug secured by a horizontal wedge, independently, Giovanni Cavalli first proposed a breech-loader gun in 1832 to the Sardinian Army, and first tested such a gun in 1845. Advances in metallurgy in the industrial era allowed for the construction of rifled breech-loading guns that could fire at a greater muzzle velocity. Production started in 1855 at the Elswick Ordnance Company and the Royal Arsenal at Woolwich, a degree of obturation was achieved via a cup on the face of the block being forced into a recessed ring on the chamber face. Whatever obturation that was achieved relied on manual labour rather than the power of the guns firing, however, the British Army and Navy preferred to revert to muzzle-loaders until larger high-powered breech-loaders with secure obturation systems that were relatively simple to operate were developed. In the meantime the French persevered with trying to develop breechloaders which combined faster loading than muzzle-loaders, high power, safety, the Lahitolle 95 mm cannon of 1875 with an interrupted screw breech met the first three requirements to a great extent and partially solved the obturation problem. Finally the de Bange system introduced in 1877 solved the problem with an asbestos pad impregnated with grease which expanded and sealed the breech on firing. The de Bange system formed the system for all subsequent screw breeches to the present day. Britain adopted the de Bange breech when it returned to breechloaders in the early 1880s after some experiments with the inferior Armstrong cup obturation system. Loading required the 3 operations in reverse and this was hence termed a three motion block and was slow to operate. While working as a designer for Thorsten Nordenfelt in London. This allowed the block to be unscrewed and swung out in two motions - the two motion interrupted screw breech, bofors continued to use this in medium artillery into the 20th century
12.
Recoil
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Recoil is the backward movement of a gun when it is discharged. To apply this counter-recoiling force, modern mounted guns may employ recoil buffering comprising springs and hydraulic recoil mechanisms, early cannons used systems of ropes along with rolling or sliding friction to provide forces to slow the recoiling cannon to a stop. Recoil buffering allows the maximum counter-recoil force to be lowered so that strength limitations of the gun mount are not exceeded, however, the same pressures acting on the base of the projectile are acting on the rear face of the gun chamber, accelerating the gun rearward during firing. This results in the required counter-recoiling force being proportionally lower, modern cannons also employ muzzle brakes very effectively to redirect some of the propellant gasses rearward after projectile exit. This provides a force to the barrel, allowing the buffering system. The same physics affecting recoil in mounted guns and cannons applies to hand-held guns, hands, arms and shoulders have considerable strength and elasticity for this purpose, up to certain practical limits. For this reason, establishing recoil safety standards for small arms remains challenging, a change in momentum of a mass requires a force, according to Newtons first law, known as the law of inertia, inertia simply being another term for mass. That force, applied to a mass, creates an acceleration, according to Newtons second law, the law of momentum -- changing the velocity of the mass changes its momentum. It is important to understand at this point that velocity is not simply speed, velocity is the speed of a mass in a particular direction. In a very technical sense, speed is a scalar, a magnitude, in summation, the total momentum of the system equals zero, surprisingly just as it did before the trigger was pulled. There are two conservation laws at work when a gun is fired, conservation of momentum and conservation of energy, recoil is explained by the law of conservation of momentum, and so it is easier to discuss it separately from energy. The nature of the process is determined by the force of the expanding gases in the barrel upon the gun. It is also determined by the force applied to the gun. The recoil force only acts during the time that the ejecta are still in the barrel of the gun, except for the case of zero-recoil, the counter-recoil force is smaller than the recoil force but lasts for a longer time. Since the recoil force and the force are not matched. In the zero-recoil case, the two forces are matched and the gun will not move when fired. In most cases, a gun is very close to a free-recoil condition, an example of near zero-recoil would be a gun securely clamped to a massive or well-anchored table, or supported from behind by a massive wall. For example, placing the butt of a large caliber gun directly against a wall, the recoil of a firearm, whether large or small, is a result of the law of conservation of momentum
13.
Gun carriage
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A gun carriage is a frame and mount that supports the gun barrel of an artillery piece, allowing it to be manoeuvred and fired. The earliest guns were laid directly onto the ground, with earth being piled up under the end of the barrel to increase the elevation. As the size of guns increased, they began to be attached to wooden frames or beds that were held down by stakes. These began to be replaced by wheeled carriages in the early 16th century, from the 16th to the mid-19th century, the main form of artillery remained the smoothbore cannon. By this time, the trunnion had been developed, with the result that the barrel could be held in two recesses in the carriage and secured with an iron band. This simplified elevation, which was achieved by raising or lowering the breech of the gun by means of a wedge called a quoin or later by a steel screw. During this time, the design of gun carriages evolved only slowly, the trunnions of the gun barrel sat on the top of the cheeks, the rearward part of each cheek was stepped so that the breech could be lifted by iron levers called handspikes. Traversing the gun was achieved by levering the rear of the carriage sideways with handspikes and these were designed to allow guns to be deployed on the battlefield and were provided with a pair of large wheels similar to those used on carts or wagons. The cheeks of field carriages were much narrower than those on the naval carriage, when the gun needed to be moved any distance, the trail could be lifted onto a second separate axle called a limber, which could then be towed by a team of horses or oxen. Limbers had been invented in France in about 1550, in recent times, most heavy guns in military service, that were not themselves mounted into a vehicles, have been mounted either with a field carriage or a split trail carriage. The field carriage is simpler - having two legs extend backwards, joining at a tail, being a hardpoint to hook on to a prime mover or set of horses, the split trail carriage, however, is more complicated, but offers distinct advantages. It consists of two legs, able to be spread independently to the sides, or brought together to allow towing or movement, in both cases, the tail of the carriage often serves to balance the gun, and protect it from rolling to any large extent. The split trail, however, allows the gun not only to be fired near the horizontal, as the field carriage does and this is less important for heavier artillery, as the guns already involve a long time to prepare a firing position. While this still limits the ability to track, it allows the guns to fire in any direction with minimal preparation. Furthermore, it part of each of the benefits of the field carriage, being weight, space. The practice has its origins in war and appears in the century in the Queens regulations of the British Army. In the United Kingdom, the visual distinction usually referred to is that in a state funeral and this distinguishing feature is not invariable, however, as shown by the use of naval ratings rather than horses at the ceremonial funeral for Lord Mountbatten in 1979
14.
Gun laying
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Gun laying is the process of aiming an artillery piece, such as a gun, howitzer or mortar on land, or at sea, against surface or air targets. It may be laying for direct fire, where the gun is aimed similarly to a rifle, or indirect fire, the term includes automated aiming using, for example, radar-derived target data and computer-controlled guns. Gun laying means moving the axis of the bore of the barrel in two planes, horizontal and vertical. A gun is traversed – rotated in a horizontal plane – to align it with the target, Gun laying is a set of actions to align the axis of a gun barrel so that it points in the required direction. This alignment is in the horizontal and vertical planes, Gun laying may be for direct fire, where the layer sees the target, or indirect fire, where the target may not be visible from the gun. Gun laying has sometimes called training the gun. Laying in the vertical plane uses data derived from trials or empirical experience, for any given gun and projectile types, it reflects the distance to the target and the size of the propellant charge. It also incorporates any differences in height between gun and target, with indirect fire, it may allow for other variables as well. With indirect fire the horizontal angle is relative to something, typically the guns aiming point, depending on the gun mount, there is usually a choice of two trajectories. The dividing angle between the trajectories is about 45 degrees, it varies due to gun dependent factors. Below 45 degrees the trajectory is called low angle, above is high angle, the differences are that low angle fire has a shorter time of flight, a lower vertex and flatter angle of descent. All guns have carriages or mountings that support the barrel assembly, early guns could only be traversed by moving their entire carriage or mounting, and this lasted with heavy artillery into World War II. Mountings could be fitted into traversing turrets on ships, coast defences or tanks, from circa 1900 field artillery carriages provided traverse without moving the wheels and trail. The carriage, or mounting, also enabled the barrel to be set at the elevation angle. With some gun mounts it is possible to depress the gun, some guns require a near-horizontal elevation for loading. An essential capability for any elevation mechanism is to prevent the weight of the barrel forcing its heavier end downward and this is greatly helped by having trunnions at the centre of gravity, although a counterbalance mechanism can be used. It also means the elevation gear has to be enough to resist considerable downward pressure. However, mortars, where the forces were transferred directly into the ground
15.
European theatre of World War II
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The Allied forces fought the Axis powers on two major fronts as well as in the adjoining Mediterranean and Middle East Theatre. Germany was humiliated in front of the world and had to pay very large war reparations, many Germans blamed their countrys post-war economic collapse and hyperinflation on the treatys conditions. After Hitler took Germany out of the League of Nations, Mussolini of Fascist Italy and Hitler formed the Rome-Berlin axis, later, Empire of Japan, under the government of Hideki Tojo, would also join as an Axis power. Japan and Germany had already signed the Anti-Comintern Pact in 1939, other smaller powers also later joined the Axis throughout the war. On September 17, the Soviet forces joined the invasion of Poland, the Polish government evacuated the country for Romania. Poland fell within five weeks, with its last large operational units surrendering on October 5 after the Battle of Kock, as the Polish September Campaign ended, Hitler offered to Britain and France peace on the basis of recognition of German European continental dominance. On October 12, the United Kingdom formally refused, despite the quick campaign in the east, along the Franco-German frontier the war settled into a quiet period. This relatively non-confrontational and mostly non-fighting period between the major powers lasted until May 10,1940, and was known as the Phoney War, several other countries, however, were drawn into the conflict at this time. By September 28,1939, the three Baltic Republics felt they had no choice but to permit Soviet bases and troops on their territory, the Baltic Republics were occupied by the Soviet army in June 1940, and finally annexed to the Soviet Union in August 1940. The Soviet Union wanted to annex Finland and offered an agreement, but Finland rejected it. In the Moscow Peace Treaty of March 12,1940, Finland ceded 10% of her territory, the Finns were embittered over having lost more land in the peace than on the battlefields, and over the perceived lack of world sympathy. Meanwhile, in western Scandinavia, Germany invaded Denmark and Norway in April 1940, sweden was able to remain neutral. Most Allied forces were in Flanders, anticipating a re-run of the World War I Schlieffen Plan, as a result of this, and also the superior German communications and tactics, the Battle of France was shorter than virtually all pre-war Allied thought could have conceived. It lasted six weeks, including the Luftwaffe bombing of Paris June 3, on June 10 Italy declared war on both France and the United Kingdom, but did not gain any significant success in this campaign. French government fled Paris, and soon, France surrendered on June 22, many French soldiers, as well as those of other occupied countries, escaped to Britain. The General de Gaulle proclaimed himself the leader of Free France. Following the unexpected victory, Hitler promoted 12 generals to the rank of field marshal during the 1940 Field Marshal Ceremony. Later, on April 24,1941, the USSR gave full recognition to the Vichy government situated in the non-occupied zone in France
16.
Pacific Ocean theater of World War II
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The Pacific Ocean theater, during World War II, was a major theater of the war between the Allies and Japan. It officially came into existence on March 30,1942, when US Admiral Chester Nimitz was appointed Supreme Allied Commander Pacific Ocean Areas. In the other theatre in the Pacific region, known as the South West Pacific theatre. Both Nimitz and MacArthur were overseen by the US Joint Chiefs, most Japanese forces in the theater were part of the Combined Fleet of the Imperial Japanese Navy, which was responsible for all Japanese warships, naval aircraft, and marine infantry units. The Rengō Kantai was led by Admiral Isoroku Yamamoto, until he was killed in an attack by U. S. fighter planes in April 1943, Yamamoto was succeeded by Admiral Mineichi Koga and Admiral Soemu Toyoda. The General Staff of the Imperial Japanese Army was responsible for Imperial Japanese Army ground and air units in Southeast Asia and the South Pacific. The IJN and IJA did not formally use joint/combined staff at the level, and their command structures/geographical areas of operations overlapped each other. In the Pacific Ocean theater, Japanese forces fought primarily against the United States Navy, US Marine Corps, the United Kingdom, New Zealand, Australia, Canada and other Allied nations also contributed forces. Pacific Crucible, War at Sea in the Pacific, 1941–1942, the Official Chronology of the U. S. Navy in World War II. In the Service of the Emperor, Essays on the Imperial Japanese Army, a History of Us, War, Peace and all that Jazz. Kafka, Roger, Pepperburg, Roy L. Warships of the World, the Campaigns of the Pacific War
17.
Explosive material
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An explosive charge is a measured quantity of explosive material, which may be composed of a single ingredient or a combination of two or more. Materials that detonate are said to be high explosives and materials that deflagrate are said to be low explosives, Explosives may also be categorized by their sensitivity. Sensitive materials that can be initiated by a small amount of heat or pressure are primary explosives. A wide variety of chemicals can explode, a number are manufactured specifically for the purpose of being used as explosives. The remainder are too dangerous, sensitive, toxic, expensive, unstable, in contrast, some materials are merely combustible or flammable if they burn without exploding. The distinction, however, is not razor-sharp, though early thermal weapons, such as Greek fire, have existed since ancient times, the first widely used explosive in warfare and mining was black powder, invented in 9th century China. This material was sensitive to water, and it produced copious amounts of dark smoke, the first useful explosive stronger than black powder was nitroglycerin, developed in 1847. Since nitroglycerin is a liquid and highly unstable, it was replaced by nitrocellulose, TNT in 1863, smokeless powder, dynamite in 1867, World War I saw the adoption of TNT trinitrotoluene in artillery shells. World War II saw a use of new explosives. In turn, these have largely replaced by more powerful explosives such as C-4. However, C-4 and PETN react with metal and catch fire easily, yet unlike TNT, C-4 and PETN are waterproof, the largest commercial application of explosives is mining. In Materials Science and Engineering, explosives are used in cladding, a thin plate of some material is placed atop a thick layer of a different material, both layers typically of metal. Atop the thin layer is placed an explosive, at one end of the layer of explosive, the explosion is initiated. The two metallic layers are forced together at high speed and with great force, the explosion spreads from the initiation site throughout the explosive. Ideally, this produces a metallurgical bond between the two layers and it is possible that some fraction of the surface material from either layer eventually gets ejected when the end of material is reached. Hence, the mass of the now welded bilayer, may be less than the sum of the masses of the two initial layers, there are applications where a shock wave, and electrostatics, can result in high velocity projectiles. Thus, explosives are substances that contain an amount of energy stored in chemical bonds. Consequently, most commercial explosives are compounds containing -NO2, -ONO2 and -NHNO2 groups that
18.
Infantry
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Infantry is the general branch of an army that engages in military combat on foot. As the troops who engage with the enemy in close-ranged combat, infantry units bear the largest brunt of warfare, Infantry can enter and maneuver in terrain that is inaccessible to military vehicles and employ crew-served infantry weapons that provide greater and more sustained firepower. In English, the 16th-century term Infantry describes soldiers who walk to the battlefield, and there engage, fight, the term arose in Sixteenth-Century Spain, which boasted one of the first professional standing armies seen in Europe since the days of Rome. It was common to appoint royal princes to military commands, and the men under them became known as Infanteria. in the Canadian Army, the role of the infantry is to close with, and destroy the enemy. In the U. S. Army, the closes with the enemy, by means of fire and maneuver, in order to destroy or capture him, or to repel his assault by fire, close combat. In the U. S. Marine Corps, the role of the infantry is to locate, close with, and destroy the enemy fire and maneuver. Beginning with the Napoleonic Wars of the early 19th century, artillery has become a dominant force on the battlefield. Since World War I, combat aircraft and armoured vehicles have become dominant. In 20th and 21st century warfare, infantry functions most effectively as part of a combined arms team including artillery, armour, Infantry relies on organized formations to be employed in battle. These have evolved over time, but remain a key element to effective infantry development and deployment, until the end of the 19th century, infantry units were for the most part employed in close formations up until contact with the enemy. This allowed commanders to control of the unit, especially while maneuvering. The development of guns and other weapons with increased firepower forced infantry units to disperse in order to make them less vulnerable to such weapons. This decentralization of command was made possible by improved communications equipment, among the various subtypes of infantry is Medium infantry. This refers to infantry which are heavily armed and armored than heavy infantry. In the early period, medium infantry were largely eliminated due to discontinued use of body armour up until the 20th century. In the United States Army, Stryker Infantry is considered Medium Infantry, since they are heavier than light infantry, Infantry doctrine is the concise expression of how infantry forces contribute to campaigns, major operations, battles, and engagements. It is a guide to action, not a set of hard, doctrine provides a very common frame of reference across the military forces, allowing the infantry to function cooperatively in what are now called combined arms operations. Doctrine helps standardise operations, facilitating readiness by establishing common ways of accomplishing infantry tasks, doctrine links theory, history, experimentation, and practice
19.
M102 howitzer
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The M102 was a light-towed 105 mm howitzer used by the United States Army in the Vietnam War, the First Gulf War, and the Iraq War. The M102 105 mm howitzer is used in air mobile, attack plane, the weapon carriage is lightweight welded aluminum, mounted on a variable recoil mechanism. When emplaced, the high volume of fire compensates in large measure for the lower explosive weight of the projectile compared to the Armys 155 mm. Since 1964, the Army acquired 1,150 M102 towed howitzers, the weapon is being replaced by the M119-series 105 mm howitzer. Units were initially equipped with the M101A1 howitzer, virtually the same 105 mm howitzer that had used to support U. S. forces since World War II. In 1966 a new 105 mm towed howitzer, the M102, was received in Vietnam, the first M102s were issued to the 1st Battalion, 21st Field Artillery, in March 1966. Replacement of the old howitzers continued steadily over the four years. Many of the more seasoned artillerymen did not want the old cannon replaced, over the years they had become familiar with its every detail and were confident that it would not disappoint them in the clutch. The M102 fires the same semi-fixed ammunition as the M101, but its longer barrel allows a higher muzzle velocity. A low silhouette made the new weapon a more target for the enemy. The 105 mm howitzer M102 is a towed weapon, which has a very low silhouette when in the firing position. The M102 howitzer fires a 33 lb projectile of semifixed ammunition and it has a muzzle velocity of 494 metres per second. The maximum rate of fire is 10 rounds per minute for the first 3 minutes, a roller tire attached to the trail assembly of the M102 permits the weapon to be rotated 6,400 mils around a firing platform, which provides the pivot for the weapon. It can be elevated from −89 mils to a maximum of 1,333 mils, the panoramic telescope has a four power, fixed focus optical system, with 178 mils field of view. It contains dry nitrogen gas to retard fogging and condensation, the parallax shield used during boresighting protects the lens. The trails are made of aluminum alloy and they are a single box trail in wishbone shape, and serve three purposes, mobility, stability, and stowage of section equipment. The lunette is the towing pintle that allows the weapon to be connected to the vehicle, when towing, vehicle has a fixed or seized tow pintle, remove the lock plate located under the lunette. The drawbar has two positions, lowered for travel and raised for firing, there are two lifting brackets to connect slings to when the howitzer is being lifted by helicopter
20.
Canadian Armed Forces
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This unified institution consists of sea, land, and air elements referred to as the Royal Canadian Navy, Canadian Army, and Royal Canadian Air Force. Under the National Defence Act, the Canadian Armed Forces are an entity separate and distinct from the Department of National Defence, the Commander-in-Chief of the Canadian Armed Forces is the reigning Canadian monarch, Queen Elizabeth II, who is represented by the Governor General of Canada. The Canadian Armed Forces is led by the Chief of the Defence Staff, during the Cold War, a principal focus of Canadian defence policy was contributing to the security of Europe in the face of the Soviet military threat. Toward that end, Canadian ground and air forces were based in Europe from the early 1950s until the early 1990s, Canadian defence policy today is based on the Canada First Defence Strategy, introduced in 2008. Based on that strategy, the Canadian military is oriented and being equipped to carry out six core missions within Canada, in North America and globally. Prior to Confederation in 1867, residents of the colonies in what is now Canada served as members of French and British forces. Thereafter, the Royal Canadian Navy was formed, and, with the advent of military aviation and these forces were organised under the Department of Militia and Defence, and split into the Permanent and Non-Permanent Active Militias—frequently shortened to simply The Militia. By 1923, the department was merged into the Department of National Defence, the first overseas deployment of Canadian military forces occurred during the Second Boer War, when several units were raised to serve under British command. Similarly, when the United Kingdom entered into conflict with Germany in the First World War, the Canadian Crown-in-Council then decided to send its forces into the Second World War, as well as the Korean War. Since 1947, Canadian military units have participated in more than 200 operations worldwide, Canada maintained an aircraft carrier from 1957 to 1970 during the Cold War, which never saw combat but participated in patrols during the Cuban Missile Crisis. At the end of the Second World War, Canada possessed the fourth-largest air force and fifth-largest naval surface fleet in the world, conscription for overseas service was introduced only near the end of the war, and only 2,400 conscripts actually made it into battle. Originally, Canada was thought to have had the third-largest navy in the world and its roots, however, lie in colonial militia groups that served alongside garrisons of the French and British armies and navies, a structure that remained in place until the early 20th century. After the 1980s, the use of the Canadian Armed Forces name gave way to Canadian Forces, land Forces during this period also deployed in support of peacekeeping operations within United Nations sanctioned conflicts. The nature of the Canadian Forces has continued to evolve and they have been deployed in Afghanistan until 2011, under the NATO-led United Nations International Security Assistance Force, at the request of the Government of Afghanistan. The Armed Forces are today funded by approximately $20, the number of primary reserve personnel is expected to go up to 30,000 by 2020, and the number of active to at least 70,000. In addition,5000 rangers and 19,000 supplementary personnel will be serving, if this happens the total strength would be around 124,000. These individuals serve on numerous CF bases located in all regions of the country, and are governed by the Queens Regulations and Orders, the 2006 renewal and re-equipment effort has resulted in the acquisition of specific equipment to support the mission in Afghanistan. It has also encompassed initiatives to renew certain so-called core capabilities, in addition, new systems have also been acquired for the Armed Forces
21.
Muzzle brake
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A muzzle brake or recoil compensator is a device connected to the muzzle of a firearm or cannon that redirects propellant gases to counter recoil and unwanted rising of the barrel during rapid fire. They have been used in forms for rifles and pistols to help control recoil. They are used on pistols for practical pistol competitions, and are usually called compensators in this context, the interchangeable terms muzzle rise, muzzle flip, or muzzle climb refer to the tendency of a handheld firearms front end to rise after firing. Firearms with less height from the line to the barrel centerline tend to experience less muzzle rise. The muzzle rises primarily because, for most firearms, the centerline of the barrel is above the center of contact between the shooter and the grip and stock. The reactive forces from the bullet and propellant gases exiting the muzzle act directly down the centerline of the barrel. If that line of force is above the center of the points, this creates a moment or torque rotational force that makes the firearm rotate. The M1946 Sieg automatic rifle had a muzzle brake that made the rifle climb downward. Muzzle brakes are simple in concept, such as the one employed on the 90 mm M3 gun used on the M47 Patton tank and this consists of a small length of tubing mounted at right angles to the end of the barrel. Brakes most often utilize slots, vents, holes, baffles, the strategy of a muzzle brake is to redirect and control the burst of combustion gases that follows the departure of a projectile. All muzzle brake designs share a basic principle, they partially divert combustion gases at a sideways angle. The momentum of the diverted gases thus does not add to the recoil, the angle toward which the gases are directed will fundamentally affect how the brake behaves. If gases are directed upward, they exert a downward force. Construction of a brake or compensator can be as simple as a diagonal cut at the muzzle end of the barrel to direct some of the escaping gas upward. On the AKM assault rifle, the brake also angles slightly to the right to counteract the movement of the rifle under recoil. Another simple method is porting, where holes or slots are machined into the barrel near the muzzle to allow the gas to escape, more advanced designs use baffles and expansion chambers to slow escaping gases. This is the principle behind a linear compensator. Ports are often added to the chambers, producing the long
Argentina
Australia
Austria
Bahrain
Bangladesh
Belgium
Benin
Bosnia and Herzegovina
Brazil
Burkina Faso
Cameroon
Canada Designated C3 - Canadian C1 (M2A1) with lengthened, 33-caliber barrel
Chile
Dominican Republic
Republic of China
Colombia
Croatia
Ecuador
El Salvador
France
Germany
Greece
Guatemala
Honduras
India
Indonesia
Iran
Iraq
Israel
Japan
South Korea
Khmer Republic
Lebanon
Liberia[19]
Lithuania
Macedonia
Malaysia
Mexico
Morocco
Myanmar
Netherlands
New Zealand
Nicaragua
Norway
Pakistan
Paraguay
Peru
Philippines
Portugal
Rhodesia[20]
Senegal
South Africa[21]
Thailand
Togo
Turkey
United States
Uruguay
Venezuela
Vietnam[3][4]
