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122-718: In late July and August 1944, Allied forces broke out of the Normandy beachhead and rapidly advanced across France, liberating the country from German occupation. The overriding goal of the Allied forces at this time was to advance quickly enough to reach the Rhine river before the Germans could man and reactivate the Siegfried Line defences which ran along the border between France and Germany. On 27 August General Omar Bradley ,

244-547: A caisson of water in which boats float while being moved between two levels; and inclined planes where a caisson is hauled up a steep railway. To cross a stream, road or valley (where the delay caused by a flight of locks at either side would be unacceptable) the valley can be spanned by a navigable aqueduct – a famous example in Wales is the Pontcysyllte Aqueduct (now a UNESCO World Heritage Site ) across

366-510: A drainage divide atop a ridge , generally requiring an external water source above the highest elevation . The best-known example of such a canal is the Panama Canal . Many canals have been built at elevations, above valleys and other waterways. Canals with sources of water at a higher level can deliver water to a destination such as a city where water is needed. The Roman Empire 's aqueducts were such water supply canals. The term

488-635: A second front in Western Europe. Churchill declined because he felt that even with American help the British did not have adequate forces to do it, and he wished to avoid costly frontal assaults such as those that had occurred at the Somme and Passchendaele in World War I . Two tentative plans code-named Operation Roundup and Operation Sledgehammer were put forward for 1942–43, but neither

610-595: A tank destroyer and 20 other vehicles. On 3 September the German High Commander in the West, Generalfeldmarschall Walter Model , decided it was impossible to hold positions in northern France and Belgium, and that his forces should withdraw to the Siegfried Line. By this time many German units were not putting up a fight when they encountered Allied forces. The number of Germans taken prisoner in

732-415: A "cistern", or depressed area just downstream from the fall, to "cushion" the water by providing a deep pool for its kinetic energy to be diffused in. Vertical falls work for drops of up to 1.5 m in height, and for discharge of up to 15 cubic meters per second. The transport capacity of pack animals and carts is limited. A mule can carry an eighth-ton [250 pounds (113 kg)] maximum load over

854-496: A canal has a series of dams and locks that create reservoirs of low speed current flow. These reservoirs are referred to as slack water levels , often just called levels . A canal can be called a navigation canal when it parallels a natural river and shares part of the latter's discharges and drainage basin , and leverages its resources by building dams and locks to increase and lengthen its stretches of slack water levels while staying in its valley . A canal can cut across

976-413: A combination of the three, depending on available water and available path: Smaller transportation canals can carry barges or narrowboats , while ship canals allow seagoing ships to travel to an inland port (e.g., Manchester Ship Canal ), or from one sea or ocean to another (e.g., Caledonian Canal , Panama Canal ). At their simplest, canals consist of a trench filled with water. Depending on

1098-1103: A few divisions on the Alpine frontier." The 1st SS Panzer Division Leibstandarte SS Adolf Hitler , 9th , 11th , 19th and 116th Panzer divisions, alongside the 2nd SS Panzer Division "Das Reich" , had only arrived in March–May 1944 to France for extensive refit after being badly damaged during the Dnieper-Carpathian Offensive. Seven of the eleven panzer or panzergrenadier divisions stationed in France were still not fully operational or only partially mobile in early June 1944. Canal Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation ) or for conveyancing water transport vehicles (e.g. water taxi ). They carry free, calm surface flow under atmospheric pressure , and can be thought of as artificial rivers . In most cases,

1220-606: A front line from Caumont-l'Éventé to the south-east of Caen in order to protect the American flank, while establishing airfields near Caen. Possession of Caen and its surroundings would give the Anglo-Canadian forces a suitable staging area for a push south to capture the town of Falaise . A secure lodgement would be established and an attempt made to hold all territory captured north of the Avranches -Falaise line during

1342-549: A journey measured in days and weeks, though much more for shorter distances and periods with appropriate rest. Besides, carts need roads. Transport over water is much more efficient and cost-effective for large cargoes. The oldest known canals were irrigation canals, built in Mesopotamia c.  4000 BC , in what is now Iraq . The Indus Valley civilization of ancient India ( c.  3000 BC ) had sophisticated irrigation and storage systems developed, including

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1464-481: A naval convoy approaching Cap d'Antifer (about 80 km from the actual D-Day landings). The illusion was bolstered by a group of small vessels towing barrage balloons . No. 218 Squadron RAF also dropped "window" near Boulogne-sur-Mer in Operation Glimmer . On the same night, a small group of Special Air Service (SAS) operators deployed dummy paratroopers over Le Havre and Isigny. These dummies led

1586-555: A necessary element of the plan for the landings. Information on the exact date and location of the landings was provided only to the topmost levels of the armed forces. Men were sealed into their marshalling areas at the end of May, with no further communication with the outside world. Troops were briefed using maps that were correct in every detail except for the place names, and most were not told their actual destination until they were already at sea. A news blackout in Britain increased

1708-581: A rather low gradient for its time. The canal is still in use after renovation. In the Middle Ages , water transport was several times cheaper and faster than transport overland. Overland transport by animal drawn conveyances was used around settled areas, but unimproved roads required pack animal trains, usually of mules to carry any degree of mass, and while a mule could carry an eighth ton, it also needed teamsters to tend it and one man could only tend perhaps five mules, meaning overland bulk transport

1830-470: A relatively narrow isthmus , so these sites were rejected. The Pas de Calais, the closest point in continental Europe to Britain, was the location of launch sites for V-1 and V-2 rockets , then still under development. The Germans regarded it as the most likely initial landing zone and accordingly made it the most heavily fortified region; however, it offered the Allies few opportunities for expansion as

1952-509: A second attack would take place at Calais. Military and civilian personnel alike were aware of the need for secrecy, and the invasion troops were as much as possible kept isolated, especially in the period immediately before the invasion. American general Henry J. F. Miller was sent back to the United States in disgrace after revealing the invasion date at a party. The Germans thought they had an extensive network of spies operating in

2074-459: A uniform altitude. Other, generally later, canals took more direct routes requiring the use of various methods to deal with the change in level. Canals have various features to tackle the problem of water supply. In cases, like the Suez Canal, the canal is open to the sea. Where the canal is not at sea level, a number of approaches have been adopted. Taking water from existing rivers or springs

2196-422: Is a channel that cuts across a drainage divide , making a navigable channel connecting two different drainage basins . Both navigations and canals use engineered structures to improve navigation: Since they cut across drainage divides, canals are more difficult to construct and often need additional improvements, like viaducts and aqueducts to bridge waters over streams and roads, and ways to keep water in

2318-701: Is presumed, introduced in Italy by Bertola da Novate in the 16th century. This allowed wider gates and also removed the height restriction of guillotine locks . To break out of the limitations caused by river valleys, the first summit level canals were developed with the Grand Canal of China in 581–617 AD whilst in Europe the first, also using single locks, was the Stecknitz Canal in Germany in 1398. In

2440-599: Is rarely less than 30 metres (98 ft) wide. In the 5th century BC, Achaemenid king Xerxes I of Persia ordered the construction of the Xerxes Canal through the base of Mount Athos peninsula, Chalkidiki , northern Greece. It was constructed as part of his preparations for the Second Persian invasion of Greece , a part of the Greco-Persian Wars . It is one of the few monuments left by

2562-418: Is steeper than the desired canal gradient. They are constructed so the falling water's kinetic energy is dissipated in order to prevent it from scouring the bed and sides of the canal. A canal fall is constructed by cut and fill . It may be combined with a regulator, bridge, or other structure to save costs. There are various types of canal falls, based on their shape. One type is the ogee fall, where

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2684-452: Is the pound lock , which consists of a chamber within which the water level can be raised or lowered connecting either two pieces of canal at a different level or the canal with a river or the sea. When there is a hill to be climbed, flights of many locks in short succession may be used. Prior to the development of the pound lock in 984 AD in China by Chhaio Wei-Yo and later in Europe in

2806-622: The 12th SS Panzer Division Hitlerjugend , were, for the most part, younger and far better equipped and trained than the static troops stationed along the coast. In early 1944, OB West was significantly weakened by personnel and materiel transfers to the Eastern Front. During the Soviet Dnieper–Carpathian Offensive (24 December 1943 – 17 April 1944), the German High Command was forced to transfer

2928-698: The 21st Army Group , which comprised all the land forces involved in the operation. The Normandy coast in northwestern France was chosen as the site of the landings, with the Americans assigned to land at sectors codenamed Utah and Omaha , the British at Sword and Gold , and the Canadians at Juno . To meet the conditions expected on the Normandy beachhead, special technology was developed, including two artificial ports called Mulberry harbours and an array of specialised tanks nicknamed Hobart's Funnies . In

3050-535: The Armoured Ramp Carrier , which other tanks could use as a bridge to scale sea-walls or to overcome other obstacles. In some areas, the beaches consisted of a soft clay that could not support the weight of tanks. The Bobbin tank unrolled matting over the soft surface, leaving it behind as a route for ordinary tanks. The Assault Vehicle Royal Engineers (AVRE) was a Churchill tank modified for many combat engineering tasks, including laying bridges; it

3172-754: The BBC produced over ten million items, some of which proved useful. The French resistance provided details on Axis troop movements and on construction techniques used by the Germans for bunkers and other defensive installations. Many German radio messages were encoded using the Enigma machine and other enciphering techniques and the codes were changed frequently. A team of code breakers stationed at Bletchley Park worked to break codes as quickly as possible to provide advance information on German plans and troop movements. British military intelligence code-named this information Ultra intelligence as it could only be provided to

3294-732: The British Expeditionary Force ) in the Dunkirk evacuation (27 May to 4 June). British planners reported to Prime Minister Winston Churchill on 4 October that even with the help of other Commonwealth countries and the United States, it would not be possible to regain a foothold in continental Europe in the near future. After the Axis invaded the Soviet Union in June 1941, Soviet leader Joseph Stalin began pressing for

3416-536: The Eastern Front , meant the Germans no longer had a pool of able young men from which to draw. German soldiers were now on average six years older than their Allied counterparts. Many in the Normandy area were Ostlegionen (eastern legions)—conscripts and "volunteers" from Turkestan , Russia, Mongolia, and elsewhere. The Wehrmacht had provided them mainly with unreliable captured equipment; they lacked motorised transport. Formations that arrived later, such as

3538-658: The Elbe , Oder and Weser being linked by canals. In post-Roman Britain, the first early modern period canal built appears to have been the Exeter Canal , which was surveyed in 1563, and open in 1566. The oldest canal in the European settlements of North America, technically a mill race built for industrial purposes, is Mother Brook between the Boston, Massachusetts neighbourhoods of Dedham and Hyde Park connecting

3660-638: The English Channel on 6 June, and more than two million Allied troops were in France by the end of August. The decision to undertake cross-channel landings in 1944 was made at the Trident Conference in Washington in May 1943. General Dwight D. Eisenhower was appointed commander of Supreme Headquarters Allied Expeditionary Force , and General Bernard Montgomery was named commander of

3782-529: The Liberation of Paris followed on 25 August. German forces retreated east across the Seine on 30 August 1944, marking the close of Operation Overlord. In June 1940, Germany's leader Adolf Hitler had triumphed in what he called "the most famous victory in history"—the fall of France . British craft evacuated to England over 338,000 Allied troops trapped along the northern coast of France (including much of

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3904-543: The Naviglio Grande built between 1127 and 1257 to connect Milan with the river Ticino . The Naviglio Grande is the most important of the lombard " navigli " and the oldest functioning canal in Europe. Later, canals were built in the Netherlands and Flanders to drain the polders and assist transportation of goods and people. Canal building was revived in this age because of commercial expansion from

4026-545: The Phoenix metropolitan area was the most complex in ancient North America. A portion of the ancient canals has been renovated for the Salt River Project and now helps to supply the city's water. The Sinhalese constructed the 87 km (54 mi) Yodha Ela in 459 A.D. as a part of their extensive irrigation network which functioned in a way of a moving reservoir due to its single banking aspect to manage

4148-528: The River Brue at Northover with Glastonbury Abbey , a distance of about 1.75 kilometres (1,900 yd). Its initial purpose is believed to be the transport of building stone for the abbey, but later it was used for delivering produce, including grain, wine and fish, from the abbey's outlying properties. It remained in use until at least the 14th century, but possibly as late as the mid-16th century. More lasting and of more economic impact were canals like

4270-504: The Somme and Marne rivers in northern France. These positions were to be used to fight a delaying action. However, by the time the German forces reached the defensive positions along the Somme and Marne they were in no condition to offer serious resistance; a US Army history of the campaign described the German units at this time as "exhausted, disorganized, and demoralized ". By late August

4392-614: The Songhai Empire of West Africa, several canals were constructed under Sunni Ali and Askia Muhammad I between Kabara and Timbuktu in the 15th century. These were used primarily for irrigation and transport. Sunni Ali also attempted to construct a canal from the Niger River to Walata to facilitate conquest of the city but his progress was halted when he went to war with the Mossi Kingdoms . Around 1500–1800

4514-595: The Supermarine Spitfire and Hawker Typhoon greatly limited the number of potential landing-sites, as comprehensive air support depended upon having planes overhead for as long as possible. Morgan considered four sites for the landings: Brittany , the Cotentin Peninsula , Normandy, and the Pas de Calais . As Brittany and Cotentin are peninsulas, the Germans could have cut off the Allied advance at

4636-477: The Transport Plan , communications infrastructure and road and rail links were bombed to cut off the north of France and to make it more difficult to bring up reinforcements. These attacks were widespread so as to avoid revealing the exact location of the invasion. Elaborate deceptions were planned to prevent the Germans from determining the timing and location of the invasion. The coastline of Normandy

4758-616: The Trident Conference in Washington in May 1943 took the decision to launch a cross-Channel invasion within the next year. Churchill favoured making the main Allied thrust into Germany from the Mediterranean theatre , but the Americans, who were providing the bulk of the men and equipment, over-ruled him. British Lieutenant-General Frederick E. Morgan was appointed Chief of Staff, Supreme Allied Commander (COSSAC), to begin detailed planning. The initial plans were constrained by

4880-430: The highest tides . The Allies wanted to schedule the landings for shortly before dawn, midway between low and high tide, with the tide coming in. This would improve the visibility of obstacles the enemy had placed on the beach while minimising the amount of time the men had to spend exposed in the open. Specific criteria were also set for wind speed, visibility, and cloud cover. Eisenhower had tentatively selected 5 June as

5002-556: The reservoirs built at Girnar in 3000 BC. This is the first time that such planned civil project had taken place in the ancient world. In Egypt , canals date back at least to the time of Pepi I Meryre (reigned 2332–2283 BC), who ordered a canal built to bypass the cataract on the Nile near Aswan . In ancient China , large canals for river transport were established as far back as the Spring and Autumn period (8th–5th centuries BC),

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5124-404: The stratum the canal passes through, it may be necessary to line the cut with some form of watertight material such as clay or concrete. When this is done with clay, it is known as puddling . Canals need to be level, and while small irregularities in the lie of the land can be dealt with through cuttings and embankments, for larger deviations other approaches have been adopted. The most common

5246-471: The 12th century. River navigations were improved progressively by the use of single, or flash locks . Taking boats through these used large amounts of water leading to conflicts with watermill owners and to correct this, the pound or chamber lock first appeared, in the 10th century in China and in Europe in 1373 in Vreeswijk , Netherlands. Another important development was the mitre gate , which was, it

5368-472: The 15th century, either flash locks consisting of a single gate were used or ramps, sometimes equipped with rollers, were used to change the level. Flash locks were only practical where there was plenty of water available. Locks use a lot of water, so builders have adopted other approaches for situations where little water is available. These include boat lifts , such as the Falkirk Wheel , which use

5490-425: The 1st Infantry Division attacked to the north-west from Avesnes into the German forces. XIX Corps was to the west of the pocket, V Corps to its south and British forces were advancing rapidly to block the Germans' escape to the north. The German forces were badly disorganised, and lacked fuel and ammunition. Around 70,000 Germans were trapped in the pocket. There was some fighting between American and German forces on

5612-460: The Allied offensive, and command and control soon broke down. The Army's headquarters at Amiens was overrun by British troops on 31 August, though its commander SS-Oberst-Gruppenführer Sepp Dietrich and his staff escaped. In late August large numbers of German military personnel were moving through the area to the south west of Mons. They were mainly members of LVIII Panzer Corps , LXXIV Army Corps and II SS Panzer Corps . These corps included

5734-456: The Americans, with the 1st Infantry and 3rd Armored Divisions taking between 7,500 and 9,000 prisoners. The 3rd Armored Division disengaged from the Mons pocket during 4 September in order to resume VII Corps' advance to the east. The 1st Infantry Division continued to eliminate German positions with the assistance of Belgian Resistance fighters, and took large numbers of prisoners. This continued

5856-673: The British side, Lieutenant-General Miles Dempsey commanded the Second Army , under which XXX Corps was assigned to Gold and I Corps to Juno and Sword. Land forces were under the command of Montgomery, and air command was assigned to Air Chief Marshal Sir Trafford Leigh-Mallory . The First Canadian Army included personnel and units from Poland , Belgium, and the Netherlands. Other Allied nations participated. The Allied Expeditionary Air Force flew over 3,200 photo-reconnaissance sorties from April 1944 until 6 June. Photos of

5978-724: The Combined Training Centre in Inveraray in Scotland. Naval exercises took place in Northern Ireland, and medical teams in London and elsewhere rehearsed how they would handle the expected waves of casualties. Paratroopers conducted exercises, including a huge demonstration drop on 23 March 1944 observed by Churchill, Eisenhower, and other top officials. Allied planners considered tactical surprise to be

6100-737: The German forces in northern France and Belgium were retreating in disarray. OB West was attempting to re-establish a coherent line along the Schelde river's estuary, the Albert Canal and the Meuse River . In late August Bradley decided that the First Army should temporarily prioritise cutting off the retreat of German units in northern France and Belgium over reaching the Rhine. The Army's commander, Lieutenant general Courtney Hodges ,

6222-539: The German front line. This cleared the path for the First Army's advance to the Siegfried Line, and aided the liberation of Belgium by British forces. On 6 September Hodges told his staff the war would be over within 10 days if the weather held. This proved too optimistic: logistical problems, difficult terrain, and the recovery of the German Army as it neared the national border slowed the Allied advance. Despite

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6344-924: The Germans to believe an additional airborne assault had occurred. Training exercises for the Overlord landings took place as early as July 1943. As the nearby beach resembled the planned Normandy landing-site, the town of Slapton in Devon , was evacuated in December 1943, and taken over by the armed forces as a site for training exercises that included the use of landing craft and the management of beach obstacles. A friendly fire incident there on 27 April 1944 resulted in as many as 450 deaths. The following day, an additional estimated 749 American soldiers and sailors died when German torpedo-boats surprised members of Assault Force "U" conducting Exercise Tiger . Exercises with landing craft and live ammunition also took place at

6466-417: The Low Countries, with another 18 stationed in Denmark and Norway. Fifteen divisions were in the process of formation in Germany, but there was no strategic reserve. The Calais region was defended by the 15th Army under Generaloberst (Colonel General) Hans von Salmuth , and Normandy by the 7th Army commanded by Generaloberst Friedrich Dollmann . Combat losses throughout the war, particularly on

6588-421: The Mons pocket was the second highest of any engagement during the 1944 campaign in the west, exceeded only by the capture of some 45,000 in the Falaise pocket during August. Had the Americans advanced more quickly or their commanders understood the size of the German forces and prioritised the engagement, many more could have been taken prisoner. The victory at Mons opened a 75-kilometer (47 mi)-wide gap in

6710-406: The Persian Empire in Europe . Greek engineers were also among the first to use canal locks , by which they regulated the water flow in the Ancient Suez Canal as early as the 3rd century BC. There was little experience moving bulk loads by carts, while a pack-horse would [i.e. 'could'] carry only an eighth of a ton. On a soft road a horse might be able to draw 5/8ths of a ton. But if

6832-476: The Southwest by 1300 CE. Archaeologists working at a major archaeological dig in the 1990s in the Tucson Basin, along the Santa Cruz River, identified a culture and people that may have been the ancestors of the Hohokam. This prehistoric group occupied southern Arizona as early as 2000 BCE, and in the Early Agricultural period grew corn, lived year-round in sedentary villages, and developed sophisticated irrigation canals. The large-scale Hohokam irrigation network in

6954-408: The UK, but in fact, all their agents had been captured, and some had become double agents working for the Allies as part of the Double-Cross System . The double agent Juan Pujol García , a Spanish opponent of the Nazis known by the code name "Garbo", developed over the two years leading up to D-Day a fake network of informants that the Germans believed were collecting intelligence on their behalf. In

7076-451: The US Army official historian Martin Blumenson wrote that "the head-on encounter at Mons was, from the tactical point of view, a surprise for both sides. Neither Americans nor Germans had been aware of the approach of the other, and both had stumbled into an unforeseen meeting that resulted in a short, impromptu battle." In 1999 Peter Mansoor gave the battle as an example of the US Army's ability to "move fast and strike hard". He argued that

7198-528: The USAAF, and 8,178 flying under the command of the RAF) Civilian deaths: Airborne assault British Sector American Sector Normandy landings American Sector Anglo-Canadian Sector Logistics Ground campaign American Sector Anglo-Canadian Sector Breakout Air and Sea operations Supporting operations Aftermath Luxembourg The Netherlands Belgium France Britain 1941–1943 1944–1945 Germany Strategic campaigns Operation Overlord

7320-415: The advance it captured 1,300 Germans. V Corps , which was in the center of the First Army's line, simultaneously advanced toward Landrecies and took it on 2 September; few German units were encountered. The 5th Panzer Army was the main unit facing the Allies in northern France during late August, and was responsible initially for forces in the region from the channel coast to Paris. It was unable to slow

7442-445: The area is bounded by numerous rivers and canals. On the other hand, landings on a broad front in Normandy would permit simultaneous threats against the port of Cherbourg , coastal ports further west in Brittany, and an overland attack towards Paris and eventually into Germany. The Allies therefore chose Normandy as the landing site. The most serious drawback of the Normandy coast – the lack of port facilities – would be overcome through

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7564-419: The area to bolster the illusion that a large force was gathering there. As well as the broadcast of fake radio-traffic, genuine radio messages from 21st Army Group were first routed to Kent via landline and then broadcast, to give the Germans the impression that most of the Allied troops were stationed there. Patton remained stationed in England until 6 July, thus continuing to deceive the Germans into believing

7686-459: The badly battered remnants of ten combat divisions , as well as smaller units and many support personnel. All three corps headquarters were out of contact with superior commands. On 31 August the three German corps commanders decided to group their forces as a provisional army led by the commander of LXXIV Army Corps, General der Infanterie Erich Straube . This command was designated Army Task Group Straube. Straube had no sources of information on

7808-399: The broader conditions in the area, but was able to determine from intercepted Allied radio broadcasts and other sources of information that his command was in imminent danger of being encircled. In response, he decided to withdraw his forces to an area near Mons where canals and marshy conditions would aid defensive efforts. The next day the German commanders decided to attempt a breakout to

7930-436: The canal pressure with the influx of water. It was also designed as an elongated reservoir passing through traps creating 66 mini catchments as it flows from Kala Wewa to Thissa Wawa . The canal was not designed for the quick conveying of water from Kala Wewa to Thissa Wawa but to create a mass of water between the two reservoirs, which would in turn provided for agriculture and the use of humans and animals. They also achieved

8052-418: The canal to form a dam. They are generally placed in pre-existing grooves in the canal bank. On more modern canals, "guard locks" or gates were sometimes placed to allow a section of the canal to be quickly closed off, either for maintenance, or to prevent a major loss of water due to a canal breach. A canal fall , or canal drop, is a vertical drop in the canal bed. These are built when the natural ground slope

8174-462: The canal. Where large amounts of goods are loaded or unloaded such as at the end of a canal, a canal basin may be built. This would normally be a section of water wider than the general canal. In some cases, the canal basins contain wharfs and cranes to assist with movement of goods. When a section of the canal needs to be sealed off so it can be drained for maintenance stop planks are frequently used. These consist of planks of wood placed across

8296-402: The capture of the port at Cherbourg. This significant expansion required the acquisition of additional landing craft, which caused the invasion to be delayed by a month until June 1944. Eventually the Allies committed 39 divisions to the Battle of Normandy: 22 American, 12 British, three Canadian, one Polish, and one French, totalling over a million troops. "Overlord" was the name assigned to

8418-409: The channel. There are two broad types of canal: Historically, canals were of immense importance to commerce and the development, growth and vitality of a civilization. In 1855 the Lehigh Canal carried over 1.2 million tons of anthracite coal; by the 1930s the company which built and operated it for over a century ceased operation. The few canals still in operation in our modern age are a fraction of

8540-574: The coastline were taken at extremely low altitude to show the invaders the terrain, obstacles on the beach, and defensive structures such as bunkers and gun emplacements. To conceal the location of the invasion, sorties were flown along all European coastline. Inland terrain, bridges, troop emplacements, and buildings were also photographed, in many cases from several angles. Members of Combined Operations Pilotage Parties clandestinely prepared detailed harbour maps, including depth soundings . An appeal for holiday pictures and postcards of Europe announced on

8662-407: The commander of the Twelfth Army Group which was the main US Army force in northern France, ordered the armies under his command to "go as far as practicable" until they out-ran their supply lines . The US Army was well-suited to this type of warfare, as its units were highly motorized and trained to conduct large scale mobile operations. The German forces in France had suffered heavy losses during

8784-903: The conditions would be unfavourable for Allied aircraft. After much discussion, Eisenhower decided that the invasion should go ahead. Allied control of the Atlantic meant that German meteorologists did not have access to as much information as the Allies on incoming weather patterns. As the Luftwaffe meteorological centre in Paris predicted two weeks of stormy weather, many Wehrmacht commanders left their posts to attend war games in Rennes , and men in many units were given leave. Marshal Erwin Rommel returned to Germany for his wife's birthday and to meet Hitler to try to get more tanks. Had Eisenhower postponed

8906-544: The date for the assault; however, on 4 June, conditions were clearly unsuitable for a landing, as high winds and heavy seas made it impossible to launch landing craft, and low clouds would prevent aircraft from finding their targets. By the evening of 4 June, the Allied meteorological team, headed by Group Captain James Stagg of the Royal Air Force , predicted that the weather would improve sufficiently so that

9028-540: The development and deployment of artificial harbours. The COSSAC staff planned to begin the invasion on 1 May 1944. The initial draft of the plan was accepted at the Quebec Conference in August 1943. General Dwight D. Eisenhower was appointed commander of Supreme Headquarters Allied Expeditionary Force (SHAEF). General Bernard Montgomery was named commander of the 21st Army Group , which comprised all of

9150-399: The drop follows an s-shaped curve to create a smooth transition and reduce turbulence . However, this smooth transition does not dissipate the water's kinetic energy, which leads to heavy scouring. As a result, the canal needs to be reinforced with concrete or masonry to protect it from eroding. Another type of canal fall is the vertical fall, which is "simple and economical". These feature

9272-461: The east since the creation of Führer Directive 51 , which no longer allowed any transfers from the west to the east. There were also transfers to the Italian front: von Rundstedt complained that many of his best units had been sent on a "fool's errand" to Italy, saying it was "madness ... that frightful boot of a country should have been evacuated ... we should have held a decent front with

9394-526: The eastern flank to secure the Orne River bridges, and north of Carentan on the western flank. The initial goal was to capture Carentan, Isigny , Bayeux , and Caen. The Americans, assigned to land at Utah and Omaha, were to cut off the Cotentin Peninsula and capture the port facilities at Cherbourg. The British at Sword and Gold , and the Canadians at Juno , were to capture Caen and form

9516-464: The effectiveness of the deception operations. Travel to and from the Republic of Ireland was banned, and movement within several kilometres of the coast of England restricted. The invasion planners specified a set of conditions regarding the timing of the invasion, deeming only a few days in each month suitable. A full moon was desirable, as it would provide illumination for aircraft pilots and have

9638-664: The engagement, along with the breakout from Normandy which had followed Operation Cobra and the invasion of southern France in August 1944, demonstrated that the US Army was able to conduct maneuver warfare in 1944, despite some commentators arguing that it had failed to do so. Robert M. Citino noted in 2017 that the battle of the Mons pocket had formed part of "one of the greatest operational victories of all time", and Hodges "had capped his operational sequence with an impressive little kesselschlacht ". Invasion of Normandy 16,714 Allied airmen killed (8,536 members of

9760-423: The entire II SS Panzer Corps from France, consisting of the 9th and 10th SS Panzer Divisions, as well as the 349th Infantry Division , 507th Heavy Panzer Battalion and the 311th and 322nd StuG Assault Gun Brigades. All told, the German forces stationed in France were deprived of 45,827 troops and 363 tanks, assault guns, and self-propelled anti-tank guns. It was the first major transfer of forces from France to

9882-502: The establishment of a large-scale lodgement on the Continent. The first phase, the amphibious invasion and establishment of a secure foothold, was code-named Operation Neptune and is often referred to as "D-Day". To gain the required air superiority needed to ensure a successful invasion, the Allies launched a strategic bombing campaign (codenamed Pointblank ) to target German aircraft-production, fuel supplies, and airfields. Under

10004-529: The expectation that fuel would be difficult or impossible to obtain on the continent, the Allies built a "Pipe-Line Under The Ocean" ( PLUTO ). Specially developed pipes 3 in (76 mm) in diameter were to be laid under the Channel from the Isle of Wight to Cherbourg by D-Day plus 18. Technical problems and the delay in capturing Cherbourg meant the pipeline was not operational until 22 September. A second line

10126-445: The fighting in Normandy, and attempted to fall back ahead of the Allied forces. Their ability to do so was limited by the rapid Allied advance, road congestion, destroyed bridges and Allied air attacks. The Germany Army's infantry units were much less mobile than their Allied equivalents, as they lacked motor transport. At the start of the Allied breakout the German dictator Adolf Hitler directed that defensive positions be prepared along

10248-647: The first day, but gained a tenuous foothold that they gradually expanded when they captured the port at Cherbourg on 26 June and the city of Caen on 21 July. A failed counterattack by German forces in response to Allied advances on 7 August left 50,000 soldiers of the German 7th Army trapped in the Falaise pocket by 19 August. The Allies launched a second invasion from the Mediterranean Sea of southern France (code-named Operation Dragoon ) on 15 August, and

10370-614: The first summit level canal to use pound locks in Europe was the Briare Canal connecting the Loire and Seine (1642), followed by the more ambitious Canal du Midi (1683) connecting the Atlantic to the Mediterranean. This included a staircase of 8 locks at Béziers , a 157 metres (515 ft) tunnel, and three major aqueducts. Canal building progressed steadily in Germany in the 17th and 18th centuries with three great rivers,

10492-721: The first three weeks. The Allied armies would then swing left to advance towards the River Seine . The invasion fleet, led by Admiral Sir Bertram Ramsay , was split into the Western Naval Task Force (under Admiral Alan Kirk ) supporting the American sectors and the Eastern Naval Task Force (under Admiral Sir Philip Vian ) in the British and Canadian sectors. The American forces of the First Army , led by Lieutenant General Omar Bradley , comprised VII Corps (Utah) and V Corps (Omaha). On

10614-462: The freedom to make deliveries well away from rail lined road beds or ditches in the dirt which could not operate in the winter. The longest extant canal today, the Grand Canal in northern China, still remains in heavy use, especially the portion south of the Yellow River . It stretches from Beijing to Hangzhou at 1,794 kilometres (1,115 miles). Canals are built in one of three ways, or

10736-405: The invasion again, the next available period with the right combination of tides (but without the desirable full moon) was two weeks later, from 18 to 20 June. As it happened, during this period the invaders would have encountered a major storm lasting four days, between 19 and 22 June, that would have made the initial landings impossible. Nazi Germany had at its disposal 50 divisions in France and

10858-475: The invasion could go ahead on 6 June. He met Eisenhower and other senior commanders at their headquarters at Southwick House in Hampshire to discuss the situation. General Montgomery and Major-General Walter Bedell Smith , Eisenhower's chief of staff, were eager to launch the invasion. Admiral Bertram Ramsay was prepared to commit his ships, while Air Chief Marshal Trafford Leigh-Mallory expressed concern that

10980-412: The invasion, the Allies conducted Operation Bodyguard , the overall strategy designed to mislead the Germans as to the date and location of the main Allied landings. Operation Fortitude included Fortitude North, a misinformation campaign using fake radio-traffic to lead the Germans into expecting an attack on Norway, and Fortitude South, a major deception designed to fool the Germans into believing that

11102-473: The land forces involved in the invasion. On 31 December 1943, Eisenhower and Montgomery first saw the COSSAC plan, which proposed amphibious landings by three divisions , with two more divisions in support. The two generals immediately insisted on expanding the scale of the initial invasion to five divisions, with airborne descents by three additional divisions, to allow operations on a wider front and to speed up

11224-502: The landings would take place at Pas de Calais in July. A fictitious First U.S. Army Group was invented, supposedly located in Kent and Sussex under the command of Lieutenant General George S. Patton . The Allies constructed dummy tanks, trucks, and landing craft, and positioned them near the coast. Several military units, including II Canadian Corps and 2nd Canadian Division , moved into

11346-549: The load were carried by a barge on a waterway, then up to 30 tons could be drawn by the same horse. — technology historian Ronald W. Clark referring to transport realities before the industrial revolution and the Canal age . Hohokam was a society in the North American Southwest in what is now part of Arizona , United States, and Sonora , Mexico. Their irrigation systems supported the largest population in

11468-480: The longest canal in the world today and the oldest extant one. It is 1,794 kilometres (1,115 mi) long and was built to carry the Emperor Yang Guang between Zhuodu ( Beijing ) and Yuhang ( Hangzhou ). The project began in 605 and was completed in 609, although much of the work combined older canals, the oldest section of the canal existing since at least 486 BC. Even in its narrowest urban sections it

11590-534: The longest one of that period being the Hong Gou (Canal of the Wild Geese), which according to the ancient historian Sima Qian connected the old states of Song, Zhang, Chen, Cai, Cao, and Wei. The Caoyun System of canals was essential for imperial taxation, which was largely assessed in kind and involved enormous shipments of rice and other grains. By far the longest canal was the Grand Canal of China , still

11712-546: The losses at the Mons pocket, most of the German forces in Northern France and Belgium managed to reach Germany. By 10 September the German high command had managed to re-establish a continuous front line from the North Sea to Switzerland. The Allies were unable to cross the Rhine until March 1945. The Mons pocket received little press coverage at the time of the battle. Few historians have since covered it. In 1961

11834-475: The months leading up to the landings, the Allies conducted Operation Bodyguard , a substantial military deception that used electronic and visual misinformation to mislead the Germans as to the date and location of the main Allied landings. Adolf Hitler placed Field Marshal Erwin Rommel in charge of developing fortifications all along Hitler's proclaimed Atlantic Wall in anticipation of landings in France. The Allies failed to accomplish their objectives for

11956-745: The months preceding D-Day, Pujol sent hundreds of messages to his superiors in Madrid, messages specially prepared by the British intelligence service to convince the Germans that the attack would come in July at Calais. Many of the German radar stations on the French coast were destroyed by the RAF in preparation for the landings. On the night before the invasion, in Operation Taxable , 617 Squadron (the famous "Dambusters") dropped strips of "window", metal foil that German radar operators interpreted as

12078-574: The most senior commanders. The Enigma code used by Field Marshal Gerd von Rundstedt , Oberbefehlshaber West (Supreme Commander West; OB West ), commander of the Western Front , was broken by the end of March. German intelligence changed the Enigma codes after the Allied landings but by 17 June the Allies were again consistently able to read them. After the disastrous Dieppe Raid , the Allies developed new technologies for Overlord. To supplement

12200-401: The next day, with the 26th Infantry Regiment taking a group of 3,000 Germans prisoner near Wasmes . The battle concluded during the evening of 5 September. Overall, around 25,000 Germans were captured in the Mons area. German casualties included approximately 3,500 killed. The remainder of the German troops, including the staffs of the three corps headquarters, escaped before the encirclement

12322-421: The night of 2/3 September. As part of this combat, a tank unit of the 3rd Armoured division destroyed a mile-long column of German vehicles. American air units also attacked German forces in the Mons pocket, and inflicted heavy casualties. Many motorised German units managed to escape from the pocket though by fighting their way through American forces. During 3 September large numbers of German troops surrendered to

12444-575: The northeast, with the goal of reaching the Nivelles area in Belgium. This would require moving their forces almost 70 kilometres (43 mi) through the Mons area in the face of the rapid Allied advance. The VII Corps was responsible for the eastern sector of the First Army's area of operations. It was commanded by Major General J. Lawton Collins , and included the 3rd Armoured Division , 1st Infantry Division and 9th Infantry Division . Collins

12566-640: The number of landing craft , most of which were already committed in the Mediterranean and in the Pacific. In part because of lessons learned in the Dieppe Raid of 19 August 1942, the Allies decided not to directly assault a heavily defended French seaport in their first landing. The failure at Dieppe also highlighted the need for adequate artillery and air support, particularly close air support , and specialised ships able to travel extremely close to shore. The short operating range of British aircraft such as

12688-506: The numbers that once fueled and enabled economic growth, indeed were practically a prerequisite to further urbanization and industrialization. For the movement of bulk raw materials such as coal and ores are difficult and marginally affordable without water transport. Such raw materials fueled the industrial developments and new metallurgy resulting of the spiral of increasing mechanization during 17th–20th century, leading to new research disciplines, new industries and economies of scale, raising

12810-540: The pre-railroad days of the industrial revolution, water transport was the gold standard of fast transportation. The first artificial canal in Western Europe was the Fossa Carolina built at the end of the 8th century under personal supervision of Charlemagne . In Britain, the Glastonbury Canal   is believed to be the first post-Roman canal and was built in the middle of the 10th century to link

12932-587: The preliminary offshore bombardment and aerial assaults, some of the landing craft were equipped with artillery and anti-tank guns to provide close supporting fire. The Allies had decided not to immediately attack any of the heavily protected French ports and two artificial ports, called Mulberry harbours , were designed by COSSAC planners. Each assembly consisted of a floating outer breakwater , inner concrete caissons (called Phoenix breakwaters ) and several floating piers. The Mulberry harbours were supplemented by blockship shelters (codenamed "Gooseberries"). With

13054-411: The size of the German force approaching Mons. The 3rd Armored Division liberated Mons on the morning of 3 September. At this time the 1st Infantry Division was at Avesnes and the 9th Infantry Division at Charleroi . The VII Corps' advance, and that of First Army's other two corps, trapped the German forces under Straube. The 3rd Armored Division set up roadblocks on the road between Mons and Avesnes, and

13176-480: The standard of living for any industrialized society. Most ship canals today primarily service bulk cargo and large ship transportation industries, whereas the once critical smaller inland waterways conceived and engineered as boat and barge canals have largely been supplanted and filled in, abandoned and left to deteriorate, or kept in service and staffed by state employees, where dams and locks are maintained for flood control or pleasure boating. Their replacement

13298-573: The valley of the River Dee . Another option for dealing with hills is to tunnel through them. An example of this approach is the Harecastle Tunnel on the Trent and Mersey Canal . Tunnels are only practical for smaller canals. Some canals attempted to keep changes in level down to a minimum. These canals known as contour canals would take longer, winding routes, along which the land was

13420-466: Was also expensive, as men expect compensation in the form of wages, room and board. This was because long-haul roads were unpaved, more often than not too narrow for carts, much less wagons, and in poor condition, wending their way through forests, marshy or muddy quagmires as often as unimproved but dry footing. In that era, as today, greater cargoes, especially bulk goods and raw materials , could be transported by ship far more economically than by land; in

13542-458: Was an option in some cases, sometimes supplemented by other methods to deal with seasonal variations in flow. Where such sources were unavailable, reservoirs  – either separate from the canal or built into its course – and back pumping were used to provide the required water. In other cases, water pumped from mines was used to feed the canal. In certain cases, extensive "feeder canals" were built to bring water from sources located far from

13664-408: Was armed with a demolition gun that could fire large charges into pillboxes . The Duplex-Drive tank ( DD tank ), another design developed by Hobart's group, was a self-propelled amphibious tank kept afloat using a waterproof canvas screen inflated with compressed air. These tanks were easily swamped, and on D-Day, many sank before reaching the shore, especially at Omaha. In the months leading up to

13786-420: Was complete. The German units also lost large quantities of equipment, including 40 armored fighting vehicles , 100 half-tracks , 120 artillery guns, 100 antitank and antiaircraft guns and almost 2000 vehicles. The VII Corps suffered few casualties. The 3rd Armored Division lost 57 men killed, and the 1st Infantry Division had 32 killed and 93 wounded. Losses of equipment were also light, and included two tanks,

13908-695: Was deemed by the British to be practical or likely to succeed. Instead, the Allies expanded their activity in the Mediterranean, launching the Operation Torch an invasion of French North Africa in November 1942, the Allied invasion of Sicily in July 1943, and Allied invasion of Italy in September. These campaigns provided the troops with valuable experience in amphibious warfare . Those attending

14030-410: Was directed on 31 August to advance to the north to cut the highway between Lille and Brussels . Hodges' main objective was the town of Tournai in Belgium, which he was ordered to liberate by midnight on 2 September. This task was assigned to XIX Corps which was responsible for the northernmost element of the First Army's area of operations. XIX Corps reached the town at 10 pm on 2 September. During

14152-445: Was divided into seventeen sectors, with code-names using a spelling alphabet —from Able, west of Omaha , to Roger on the east flank of Sword . 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, and White. Allied planners envisaged preceding the sea-borne landings with airborne drops: near Caen on

14274-407: Was gradual, beginning first in the United States in the mid-1850s where canal shipping was first augmented by, then began being replaced by using much faster , less geographically constrained & limited, and generally cheaper to maintain railways . By the early 1880s, canals which had little ability to economically compete with rail transport, were off the map. In the next couple of decades, coal

14396-424: Was increasingly diminished as the heating fuel of choice by oil, and growth of coal shipments leveled off. Later, after World War I when motor-trucks came into their own, the last small U.S. barge canals saw a steady decline in cargo ton-miles alongside many railways, the flexibility and steep slope climbing capability of lorries taking over cargo hauling increasingly as road networks were improved, and which also had

14518-564: Was laid from Dungeness to Boulogne in late October. The British built specialised tanks, nicknamed Hobart's Funnies , to deal with conditions expected during the Normandy campaign. Developed under the supervision of Major-General Percy Hobart , these were modified M4 Sherman and Churchill tanks . Examples include the Sherman Crab tank (equipped with a mine flail), the Churchill Crocodile (a flame-throwing tank), and

14640-426: Was once used to describe linear features seen on the surface of Mars , Martian canals , an optical illusion. A navigation is a series of channels that run roughly parallel to the valley and stream bed of an unimproved river. A navigation always shares the drainage basin of the river. A vessel uses the calm parts of the river itself as well as improvements, traversing the same changes in height. A true canal

14762-740: Was ordered on 31 August to cease his corps drive to the north-east, and turn north towards Avesnes-sur-Helpe , Maubeuge and Mons . The 3rd Armored Division led this advance, with the 1st Infantry Division on the corps' left and the 9th Infantry Division on the right of the line. The 4th Cavalry Group was assigned responsibility for maintaining contact with the Third Army to the south. The corps initially encountered only German outposts . The 3rd Armored Division advanced rapidly, and communications problems meant that Collins did not receive orders from Hodges on 2 September to stop short of Mons to conserve fuel supplies. At this time, Collins did not appreciate

14884-453: Was the codename for the Battle of Normandy , the Allied operation that launched the successful liberation of German-occupied Western Europe during World War II . The operation was launched on 6 June 1944 ( D-Day ) with the Normandy landings (Operation Neptune). A 1,200-plane airborne assault preceded an amphibious assault involving more than 5,000 vessels. Nearly 160,000 troops crossed

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