1.
England
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England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west, the Irish Sea lies northwest of England and the Celtic Sea lies to the southwest. England is separated from continental Europe by the North Sea to the east, the country covers five-eighths of the island of Great Britain in its centre and south, and includes over 100 smaller islands such as the Isles of Scilly, and the Isle of Wight. England became a state in the 10th century, and since the Age of Discovery. The Industrial Revolution began in 18th-century England, transforming its society into the worlds first industrialised nation, Englands terrain mostly comprises low hills and plains, especially in central and southern England. However, there are uplands in the north and in the southwest, the capital is London, which is the largest metropolitan area in both the United Kingdom and the European Union. In 1801, Great Britain was united with the Kingdom of Ireland through another Act of Union to become the United Kingdom of Great Britain and Ireland. In 1922 the Irish Free State seceded from the United Kingdom, leading to the latter being renamed the United Kingdom of Great Britain, the name England is derived from the Old English name Englaland, which means land of the Angles. The Angles were one of the Germanic tribes that settled in Great Britain during the Early Middle Ages, the Angles came from the Angeln peninsula in the Bay of Kiel area of the Baltic Sea. The earliest recorded use of the term, as Engla londe, is in the ninth century translation into Old English of Bedes Ecclesiastical History of the English People. According to the Oxford English Dictionary, its spelling was first used in 1538. The earliest attested reference to the Angles occurs in the 1st-century work by Tacitus, Germania, the etymology of the tribal name itself is disputed by scholars, it has been suggested that it derives from the shape of the Angeln peninsula, an angular shape. An alternative name for England is Albion, the name Albion originally referred to the entire island of Great Britain. The nominally earliest record of the name appears in the Aristotelian Corpus, specifically the 4th century BC De Mundo, in it are two very large islands called Britannia, these are Albion and Ierne. But modern scholarly consensus ascribes De Mundo not to Aristotle but to Pseudo-Aristotle, the word Albion or insula Albionum has two possible origins. Albion is now applied to England in a poetic capacity. Another romantic name for England is Loegria, related to the Welsh word for England, Lloegr, the earliest known evidence of human presence in the area now known as England was that of Homo antecessor, dating to approximately 780,000 years ago. The oldest proto-human bones discovered in England date from 500,000 years ago, Modern humans are known to have inhabited the area during the Upper Paleolithic period, though permanent settlements were only established within the last 6,000 years
2.
Naval warfare
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Naval warfare is combat in and on the sea, the ocean, or any other major body of water such as a large lake or wide river. Mankind has fought battles on the sea for more than 3,000 years, even in the interior of large landmasses, transportation before the advent of extensive railroads was largely dependent upon rivers, canals, and other navigable waterways. Prior to 1750, materials largely moved by barge or sea vessels. Thus armies, with their exorbitant needs for food, ammunition, the oceanic influences throughout pre-recorded history, and classical works such as The Odyssey underscore the past influences. The Persian Empire – united and strong – could not prevail against the might of the Athenian fleet combined with that of city states in several attempts to conquer the Greek city states. Phoenicias and Egypts power, Carthages and even Romes largely depended upon control of the seas, so too did the Venetian Republic dominate Italys city states, thwart the Ottoman Empire, and dominate commerce on the Silk Road and the Mediterranean in general for centuries. For three centuries, the Northmen raided and pillaged and went where they willed, far into central Russia and the Ukraine, many sea battles through history also provide a reliable source of shipwrecks for underwater archaeology. A major example is the exploration of the wrecks of various warships in the Pacific Ocean, the first dateable recorded sea battle occurred about 1210 BC, Suppiluliuma II, king of the Hittites, defeated a fleet from Cyprus, and burned their ships at sea. In the Battle of the Delta, the Ancient Egyptians defeated the Sea Peoples in a sea battle circa 1175 BC, no written mention of strategy or tactics seems to have survived. Josephus Flavius reports a battle between Tyre and the king of Assyria who was aided by the other cities in Phoenicia. The battle took place off the shores of Tyre, although the Tyrian fleet was much smaller in size, the Tyrians defeated their enemies. The Greeks of Homer just used their ships as transport for land armies and it seems unlikely that all this was the product of a single mind or even of a generation, most likely the period of evolution and experimentation was simply not recorded by history. After some initial battles while subjugating the Greeks of the Ionian coast, the Persians determined to invade Greece proper. The first Persian campaign, in 492 BC, was aborted because the fleet was lost in a storm, attacks by the Greek armies repulsed these. The third Persian campaign in 480 BC, under Xerxes I of Persia, but the defeat on land at Thermopylae forced a Greek withdrawal, and Athens evacuated its population to nearby Salamis Island. The ensuing Battle of Salamis was one of the engagements of history. Themistocles trapped the Persians in a too narrow for them to bring their greater numbers to bear. Aeschylus wrote a play about the defeat, The Persians, which was performed in a Greek theatre competition a few years after the battle and it is the oldest known surviving play
3.
Juno Beach
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Juno or Juno Beach was one of five beaches of the Allied invasion of German-occupied France in the Normandy landings on 6 June 1944 during the Second World War. The beach spanned from Courseulles, a village just east of the British beach Gold, to Saint-Aubin-sur-Mer, the beach was defended by two battalions of the German 716th Infantry Division, with elements of the 21st Panzer Division held in reserve near Caen. The invasion plan called for two brigades of the 3rd Canadian Division to land on two beach sectors—Mike and Nan—focusing on Courseulles, Bernières and Saint-Aubin and it was hoped that the preliminary naval and air bombardments would soften up the beach defences and destroy coastal strong points. Close support on the beaches was to be provided by amphibious tanks of the 2nd Canadian Armoured Brigade, the 3rd Canadian Divisions D-Day objectives were to capture Carpiquet Airfield and reach the Caen–Bayeux railway line by nightfall. Several assault companies—notably those of the Royal Winnipeg Rifles and The Queens Own Rifles of Canada—took heavy casualties in the minutes of the first wave. Strength of numbers, as well as coordinated fire support from artillery and armoured squadrons, the reserves of the 7th and 8th brigades began deploying at 08,30, while the 9th Brigade began its deployment at 11,40. The subsequent push inland towards Carpiquet and the Caen–Bayeux railway line achieved mixed results, the sheer numbers of men and vehicles on the beaches created lengthy delays between the landing of the 9th Brigade and the beginning of substantive attacks to the south. The 7th Brigade encountered heavy initial opposition before pushing south and making contact with the British 50th Division at Creully, the 8th Brigade encountered heavy resistance from a battalion of the 716th at Tailleville, while the 9th Brigade deployed towards Carpiquet early in the evening. Resistance in Saint-Aubin prevented the Royal Marines from establishing contact with the British 3rd Division on Sword, in 1942, the Western Allies agreed to open a second front in Western Europe to take pressure off the beleaguered Red Army in the Soviet Union. In August 1942 Anglo-Canadian forces attempted an abortive landing—Operation Jubilee—at the French port of Dieppe, the attack was poorly planned and ended in disaster,4,963 soldiers were killed, wounded or captured. Following the Anglo-American victory against Field Marshal Erwin Rommel in North Africa in May 1943, British, American and Canadian troops invaded Sicily in July 1943, by December the Allies progress had slowed facing tenacious German resistance and the difficult geography of the Italian Peninsula. After gaining valuable experience in amphibious assaults and inland fighting, Allied planners returned to the plans to invade Northern France, under the direction of General Dwight D. Eisenhower and Frederick Morgan, plans for the invasion of France coalesced as Operation Overlord. The attack was scheduled for Monday,5 June 1944. Eight further sectors were added when the invasion was extended to include Utah on the Cotentin Peninsula. Sectors were further subdivided into beaches identified by the colours Green, Red, after delays due to both logistical difficulties and poor weather, the D-Day of Overlord, the largest amphibious operation ever, was postponed 24 hours to 6 June 1944. Eisenhower and Montgomery, commander of 21st Army Group, aimed to capture Caen within the first day, and liberate Paris within 90 days. Operation Neptune, the phase of Overlord, called for a five-division front spread across 50 miles of coastline. Eisenhower and General Bernard Montgomery hoped to have eight infantry divisions, the landing zone was divided into five landing areas, with the Americans attacking Utah and Omaha, and the British attacking Gold and Sword
4.
Seawall
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A seawall is a form of coastal defense constructed where the sea, and associated coastal processes, impact directly upon the landforms of the coast. The purpose of a sea wall is to protect areas of habitation, conservation and leisure activities from the action of tides, waves. As a seawall is a feature it will conflict with the dynamic nature of the coast. The coast is generally a high-energy, dynamic environment with spatial variations over a range of timescales. The coast is exposed to erosion by rivers and winds as well as the sea, because of these persistent natural forces, sea walls need to be maintained to maintain their effectiveness. Sea walls are hard engineering shore-based structures which protect the coast from erosion, but various environmental problems and issues may arise from the construction of a sea wall, including disrupting sediment movement and transport patterns. Combined with a construction cost, this has led to an increasing use of other soft engineering coastal management options such as beach replenishment. Sea walls may be constructed from various materials, most commonly reinforced concrete, boulders, steel, other possible construction materials are, vinyl, wood, aluminium, fibreglass composite, and large biodegrable sandbags made of jute and coir. In the UK, sea wall also refers to a bank used to create a polder. A seawall works by reflecting incident wave energy back into the sea, sea walls have two specific weaknesses. First, wave reflection from the wall may result in scour, second, sea walls may accelerate erosion of adjacent, unprotected coastal areas because they affect the littoral drift process. Different designs of man-made tsunami barriers include building reefs and forests to above-ground, in 2005, India began planting Casuarina and coconut saplings on its coast as a natural barrier against future tsunamis like the 2004 Indian Ocean earthquake. Studies have found that a tsunami wall could reduce tsunami wave heights by up to 83%. The design and type of sea wall that is appropriate depends on aspects specific to the location, a Japanese study of this tsunami in Sri Lanka used satellite imagery modelling to establish the parameters of coastal resistance as a function of different types of trees. Natural barriers, such as reefs and mangrove forests, prevent the spread of tsunamis. A cost benefit approach is a way to determine whether a seawall is appropriate. Besides controlling erosion, consideration must be given to the effects of hardening a shoreline on natural coastal ecosystems, a seawall is a static feature which can conflict with the dynamic nature of the coast and impede the exchange of sediment between land and sea. The table below summarises some positive and negative effects of seawalls which can be used when comparing their effectiveness with other coastal management options, such as beach nourishment
5.
Dieppe Raid
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The raid took place on the northern coast of France on 19 August 1942. The assault began at 5,00 a. m. and it involved 5,000 Canadians,1,000 British troops, and 50 United States Army Rangers. Objectives included seizing and holding a major port for a short period, upon retreat, the Allies also wanted to destroy coastal defences, port structures and all strategic buildings. The raid had the objectives of boosting morale and demonstrating the firm commitment of the United Kingdom to open a western front in Europe. Virtually none of these objectives were met, Allied fire support was grossly inadequate and the raiding force was largely trapped on the beach by obstacles and German fire. Less than 10 hours after the first landings, the last Allied troops had all either killed, evacuated. Instead of a demonstration of resolve, the bloody fiasco showed the world that the Allies could not hope to invade France for a long time, some intelligence successes were achieved, including electronic intelligence. Of the 6,086 men who made it ashore,3,367 were either killed, wounded or captured, the Royal Air Force failed to lure the Luftwaffe into open battle, and lost 106 aircraft, compared to 48 lost by the Luftwaffe. The Royal Navy lost 33 landing craft and one destroyer, the events at Dieppe influenced preparations for the North African and Normandy landings. This was accompanied by development of techniques and equipment for amphibious warfare, in late 1941 a scheme was put forward for the landing of 12 divisions around Le Havre based on a withdrawal of German troops to counter Soviet success in the east. From this came a proposed test of the scheme in the form of Operation Rutter, when these missions involved two or three fighters, they were known as rhubarbs, and rodeos if they involved more than three aircraft. In the second half of 1941, the offensive over France was greatly stepped up, leading to the losses of 411 British or Canadian aircraft in the rhubarb. In response, in the spring of 1942 the Luftwaffe deployed the new Focke-Wulf Fw 190 fighter to its airfields in France. The Fw 190 fighters were greatly superior to the Supermarine Spitfires and Hawker Hurricanes used by the British and Canadian pilots and it was largely because of pressure from the RAF to fight the greatest air battle over the French coast that Operation Rutter/Jubilee went ahead. Dieppe, a town in the Seine-Inférieure department of France, is built along a long cliff that overlooks the English Channel. The River Scie is on the end of the town. In 1942, the Germans had demolished some seafront buildings to aid in defence and had set up two large artillery batteries at Berneval-le-Grand and Varengeville-sur-Mer. One important consideration for the planners was that Dieppe was within range of the Royal Air Forces fighter aircraft, there was also intense pressure from the Soviet government to open up a second front in Western Europe
6.
MG 34
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The Maschinengewehr 34, or MG34, is a German recoil-operated air-cooled machine gun, first tested in 1929, introduced in 1934, and issued to units in 1936. It accepts the 7. 92×57mm Mauser cartridge, and is considered the worlds first general-purpose machine gun. The versatile MG34 was arguably the most advanced machine gun in the world at the time of its deployment and its combination of exceptional mobility – being light enough to be carried by one man – and high rate of fire was unmatched. It entered service in numbers following Hitlers repudiation of the Versailles Treaty in 1936. Nonetheless, the design proved too complex for production, and was supplemented by the cheaper and simpler MG42. The MG34 was based on a 1930 Rheinmetall design, the MG30, the Swiss and Austrian militaries had both licensed and produced the MG30 from Rheinmetall shortly after patent. The MG30 design was adapted and modified by Heinrich Vollmer of Mauser Industries, Vollmer modified the feed mechanism to accept either drum magazines or belt ammunition. He also increased the rate of fire, the MG 34s double crescent trigger dictated either semiautomatic or fully automatic firing modes. In the field, the weapon could operate in offensive or defensive applications, the offensive model, with a mobile soldier, used a drum magazine that could hold either 50 or 75 rounds of ammunition. In a stationary defensive role, the gun was mounted on a bipod or tripod, belts were carried in boxes of five. Belt lengths could be linked for sustained fire, during sustained fire, barrels would have to be changed at intervals due to the heat generated by the rapid rate of fire. If the barrels were not changed properly, the weapon would misfire, changing barrels was a rapid process for the trained operator and involved disengaging a latch and swinging the receiver to the right for the insertion of a new barrel. Accordingly, stationary defensive positions required more than one operator, the MG34 was the mainstay of German Army support weapons from the time of its first issue in 1935 until 1942, when it was supplanted by the next generation Maschinengewehr 42 or MG42. For its successor, the MG42, the Germans instead used mass production techniques similar to those that created the MP40 submachine gun, however, the Germans nevertheless continued widespread production of MG 34s until the end of the war. The MG34 was used as the primary machine gun during the 1930s. The MG34 was intended to replace the MG13 and other machine guns. It was designed primarily by Heinrich Vollmer from the Mauser Werke, changes to the operating mechanism improved the rate of fire to between 800 and 900 rpm. The new gun was accepted for service almost immediately and was liked by the troops
7.
Normandy landings
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The Normandy landings were the landing operations on Tuesday,6 June 1944 of the Allied invasion of Normandy in Operation Overlord during World War II. The largest seaborne invasion in history, the operation began the liberation of German-occupied northwestern Europe from Nazi control, planning for the operation began in 1943. Adolf Hitler placed German Field Marshal Erwin Rommel in command of German forces, the amphibious landings were preceded by extensive aerial and naval bombardment and an airborne assault—the landing of 24,000 American, British, and Canadian airborne troops shortly after midnight. Allied infantry and armoured divisions began landing on the coast of France at 06,30, the target 50-mile stretch of the Normandy coast was divided into five sectors, Utah, Omaha, Gold, Juno, and Sword. Strong winds blew the landing craft east of their positions, particularly at Utah. Casualties were heaviest at Omaha, with its high cliffs, at Gold, Juno, and Sword, several fortified towns were cleared in house-to-house fighting, and two major gun emplacements at Gold were disabled, using specialised tanks. The Allies failed to any of their goals on the first day. Carentan, St. Lô, and Bayeux remained in German hands, and Caen, German casualties on D-Day have been estimated at 4,000 to 9,000 men. Allied casualties were at least 10,000, with 4,414 confirmed dead, museums, memorials, and war cemeteries in the area now host many visitors each year. Between 27 May and 4 June 1940, over 338,000 troops of the British Expeditionary Force, after the German Army invaded the Soviet Union in June 1941, the Soviet leader Joseph Stalin began pressing his allies for the creation of a second front in western Europe. In late May 1942 the Soviet Union and the United States made a joint announcement that a. full understanding was reached with regard to the urgent tasks of creating a front in Europe in 1942. Instead of a return to France, the Western Allies staged offensives in the Mediterranean Theatre of Operations. By mid-1943 the campaign in North Africa had been won, the Allies then launched the invasion of Sicily in July 1943, and subsequently invaded Italy in September the same year. By then, Soviet forces were on the offensive and had won a victory at the Battle of Stalingrad. The decision to undertake a cross-channel invasion within the year was taken at the Trident Conference in Washington in May 1943. Initial planning was constrained by the number of landing craft, most of which were already committed in the Mediterranean. At the Tehran Conference in November 1943, Roosevelt and Churchill promised Stalin that they would open the second front in May 1944. Four sites were considered for the landings, Brittany, the Cotentin Peninsula, Normandy, as Brittany and Cotentin are peninsulas, it would have been possible for the Germans to cut off the Allied advance at a relatively narrow isthmus, so these sites were rejected
8.
Machine gun
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A machine gun is a fully automatic mounted or portable firearm designed to fire bullets in quick succession from an ammunition belt or magazine, typically at a rate of 300 to 1800 rounds per minute. Note that not all fully automatic firearms are machine guns, submachine guns, rifles, assault rifles, shotguns, pistols or cannons may be capable of fully automatic fire, but are not designed for sustained fire. Many machine guns also use belt feeding and open bolt operation, unlike semi-automatic firearms, which require one trigger pull per round fired, a machine gun is designed to fire for as long as the trigger is held down. Nowadays the term is restricted to heavy weapons, able to provide continuous or frequent bursts of automatic fire for as long as ammunition lasts. Machine guns are used against personnel, aircraft and light vehicles, or to provide suppressive fire. Some machine guns have in practice sustained fire almost continuously for hours, because they become very hot, practically all machine guns fire from an open bolt, to permit air cooling from the breech between bursts. They also usually have either a barrel cooling system, slow-heating heavyweight barrel, although subdivided into light, medium, heavy or general-purpose, even the lightest machine guns tend to be substantially larger and heavier than standard infantry arms. Medium and heavy guns are either mounted on a tripod or on a vehicle, when carried on foot. Medium machine guns use full-sized rifle rounds and are designed to be used from fixed positions mounted on a tripod. 50in, the M249 automatic rifle is operated by an automatic rifleman, but its ammunition may be carried by other Soldiers within the squad or unit. The M249 machine gun is a crew-served weapon, Machine guns usually have simple iron sights, though the use of optics is becoming more common. Many heavy machine guns, such as the Browning M2.50 caliber machine gun, are enough to engage targets at great distances. During the Vietnam War, Carlos Hathcock set the record for a shot at 7382 ft with a.50 caliber heavy machine gun he had equipped with a telescopic sight. This led to the introduction of.50 caliber anti-materiel sniper rifles, selective fire rifles firing a full-power rifle cartridge from a closed bolt are called automatic rifles or battle rifles, while rifles that fire an intermediate cartridge are called assault rifles. Unlocking and removing the spent case from the chamber and ejecting it out of the weapon as bolt is moving rearward Loading the next round into the firing chamber. Usually the recoil spring tension pushes bolt back into battery and a cam strips the new round from a feeding device, cycle is repeated as long as the trigger is activated by operator. Releasing the trigger resets the trigger mechanism by engaging a sear so the weapon stops firing with bolt carrier fully at the rear, the operation is basically the same for all autoloading firearms, regardless of the means of activating these mechanisms. Most modern machine guns use gas-operated reloading, a recoil actuated machine gun uses the recoil to first unlock and then operate the action. Machine guns such as the M2 Browning and MG42, are of this type, a cam, lever or actuator demultiplicates the energy of the recoil to operate the bolt
9.
Bunker
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A bunker is a defensive military fortification designed to protect people or valued materials from falling bombs or other attacks. Bunkers are mostly underground, compared to blockhouses which are mostly above ground and they were used extensively in World War I, World War II, and the Cold War for weapons facilities, command and control centers, and storage facilities. Bunkers can also be used as protection from tornadoes, trench bunkers are small concrete structures, partly dug into the ground. Many artillery installations, especially for coastal artillery, have historically been protected by extensive bunker systems, typical industrial bunkers include mining sites, food storage areas, dumps for materials, data storage, and sometimes living quarters. When a house is purpose-built with a bunker, the location is a reinforced below-ground bathroom with fibre-reinforced plastic shells. Bunkers deflect the blast wave from nearby explosions to prevent ear, nuclear bunkers must also cope with the underpressure that lasts for several seconds after the shock wave passes, and block radiation. A bunkers door must be at least as strong as the walls, in bunkers inhabited for prolonged periods, large amounts of ventilation or air conditioning must be provided. Bunkers can be destroyed with explosives and bunker-busting warheads. The word bunker originates as a Scots word for bench, seat, the word possibly has a Scandinavian origin, Old Swedish bunke means boards used to protect the cargo of a ship. A sense of earthen seat is recorded 1805, with the spelling boncure from whence the use to refer to sand traps in golf, all the early references to its usage in the Oxford English Dictionary are to German fortifications. This type of bunker is a concrete structure, partly dug into the ground. Such bunkers give the defending soldiers better protection than the open trench and they also provide shelter against the weather. The front bunker of a system usually includes machine guns or mortars. The rear bunkers are usually used as posts or Tactical Operations Centers, for storage. Many artillery installations, especially for coastal artillery, have historically been protected by extensive bunker systems, artillery bunkers are some of the largest individual pre-Cold War bunkers. The walls of the Batterie Todt gun installation in northern France were up to 3.5 m thick, typical industrial bunkers include mining sites, food storage areas, dumps for materials, data storage, and sometimes living quarters. They were built mainly by nations like Germany during World War II to protect important industries from aerial bombardment, industrial bunkers are also built for control rooms of dangerous activities, e. g. tests of rocket engines or explosive experiments. They are also built in order to perform experiments in them or to store radioactive or explosive goods
10.
Trench warfare
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The most famous use of trench warfare is the Western Front in World War I. It has become a byword for stalemate, attrition, sieges, Trench warfare occurred when a revolution in firepower was not matched by similar advances in mobility, resulting in a grueling form of warfare in which the defender held the advantage. On the Western Front in 1914–18, both sides constructed elaborate trench and dugout systems opposing each other along a front, protected from assault by barbed wire, mines, the area between opposing trench lines was fully exposed to artillery fire from both sides. Attacks, even if successful, often sustained severe casualties, with the development of armoured warfare, emphasis on trench warfare has declined, but still occurs where battle-lines become static. Field works are as old as armies, Roman legions, when in the presence of an enemy, entrenched camps nightly when on the move. In the early modern era they were used to block possible lines of advance and they played a pivotal role in manoeuvring that took place before the Battle of Blenheim. The lines were captured by the French in 1707 and demolished, the French built the 19-kilometre-long Lines of Weissenburg during the War of the Spanish Succession under the orders of the Duke of Villars in 1706. These were to remain in existence for just over 100 years and were last manned during Napoleons Hundred Days, the French built the Lines of Ne Plus Ultra during the winter of 1710–1711, which have been compared to the trenches of World War I. They ran from Arras to Cambrai and Valenciennes where they linked up with existing defensive lines fronted by the river Sambre and they were breached in the 1711 campaign season by the Duke of Marlborough through a magnificent piece of manoeuvring. During the Peninsular War, the British and Portuguese constructed the Lines of Torres Vedras in 1809 and 1810, nor were fortifications restricted to European powers. British casualty rates of up to 45 percent, such as at the Battle of Ohaeawai in 1845, proved contemporary firepower was insufficient to dislodge defenders from a trench system. Fundamentally, as the range and rate of fire of rifled small arms increased and this was only made more lethal by the introduction of rapid-firing artillery, exemplified by the French 75, and high explosive fragmentation rounds. The increases in firepower had outstripped the ability of infantry to cover the ground between firing lines, and the ability of armour to withstand fire and it would take a revolution in mobility to change that. Trench warfare is associated with the First World War of 1914–18. Both sides concentrated on breaking up attacks and on protecting their own troops by digging deep into the ground. Trench warfare was conducted on other fronts, including Italy. Trench warfare has become a symbol of the futility of war. To the French, the equivalent is the attrition of the Battle of Verdun in which the French Army suffered 380,000 casualties, Trench warfare is associated with mass slaughter in appalling conditions
