Ardennes in the context of "Battle of the Bulge"

The Manstein plan or Case Yellow (German: Fall Gelb; also known after the war as Unternehmen Sichelschnitt a transliteration of the English Operation Sickle Cut), was the war plan of the German armed forces (Wehrmacht) for the Battle of France in 1940. The original invasion plan was an awkward compromise devised by General Franz Halder, the chief of staff of Oberkommando des Heeres (OKH, Army High Command) that satisfied no one. Documents with details of the plan fell into Belgian hands during the Mechelen incident on 10 January 1940 and the plan was revised several times, each giving more emphasis to an attack by Army Group A through the Ardennes, which progressively reduced the offensive by Army Group B through the Low Countries to a diversion.

In the final version of the plan, the main effort of the German invasion was made against the Ardennes, the weakest part of the Allied line, where the defence was left to second-rate French divisions in the Second Army and the Ninth Army, on the assumption that the difficulty of moving masses of men and equipment would give the French plenty of time to send reinforcements if the area was attacked. The Seventh Army, which had been the most powerful part of the French strategic reserve, had been committed to a rush through Belgium to join with the Dutch Army to the north, in the Breda variant of Plan D, the Allied deployment plan.

The Dunkirk evacuation, codenamed Operation Dynamo and also known as the Miracle of Dunkirk, or just Dunkirk, was the evacuation of more than 338,000 Allied soldiers during the Second World War from the beaches and harbour of Dunkirk, in the north of France, between 26 May and 4 June 1940. The operation began after large numbers of Belgian, British, and French troops were cut off and surrounded by German troops during the six-week Battle of France.

After Germany invaded Poland in September 1939, France and the British Empire declared war on Germany and imposed an economic blockade. The British Expeditionary Force (BEF) was sent to help defend France. After the Phoney War of October 1939 to April 1940, Germany invaded Belgium, the Netherlands, and France on 10 May 1940. Three panzer corps attacked through the Ardennes and drove northwest to the English Channel. By 21 May, German forces had trapped the BEF, the remains of the Belgian forces, and three French field armies along the northern coast of France. BEF commander General Viscount Gort immediately saw evacuation across the Channel as the best course of action, and began planning a withdrawal to Dunkirk, the closest good port.

The invasion of Belgium or Belgian campaign (10–28 May 1940), often referred to within Belgium as the 18 Days' Campaign (French: Campagne des 18 jours; Dutch: Achttiendaagse Veldtocht), formed part of the larger Battle of France, an offensive campaign by Germany during the Second World War. It took place over 18 days in May 1940 and ended with the German occupation of Belgium following the surrender of the Belgian Army.

On 10 May 1940, Germany invaded Luxembourg, the Netherlands, and Belgium under the operational plan Fall Gelb (Case Yellow). The Allied armies attempted to halt the German Army in Belgium, believing it to be the main German thrust. After the French had fully committed the best of the Allied armies to Belgium between 10 and 12 May, the Germans enacted the second phase of their operation, a break-through, or sickle cut, through the Ardennes, and advanced toward the English Channel. The German Army (Heer) reached the Channel after five days, encircling the Allied armies. The Germans gradually reduced the pocket of Allied forces, forcing them back to the sea. The Belgian Army surrendered on 28 May 1940, ending the battle.

The Variscan orogeny or Hercynian orogeny was a geologic mountain-building event caused by Late Paleozoic continental collision between Euramerica (Laurussia) and Gondwana to form the supercontinent of Pangaea. It remains visible today as a series of isolated massifs, including the Ardennes, Bohemian Massif, Vosges-Black Forest, Armorican Massif, Cornubian Massif, Massif Central, and Iberian System. These are interspersed with Mesozoic and Cenozoic sedimentary basins. The chain also crops out in southern Ireland and was later incorporated into the Alpine orogeny (external crystalline massifs) and Pyrenean orogeny. These ancient massifs form the pre-Permian basement of western and Central Europe, part of a larger mountain system stretching from the Ural Mountains in Russia to the Appalachian Mountains in North America.

The chain originated from the convergence and collision of three continental masses: the microcontinent Armorica and the supercontinents Protogondwana and Laurussia (a union of Laurentia and Baltica from the Caledonian orogeny). This convergence contributed to the formation of the supercontinent Pangaea.

Grand Est (French: [ɡʁɑ̃t‿ɛst] ; English: "Greater East") is an administrative region in northeastern France. It superseded three former administrative regions, Alsace, Champagne-Ardenne and Lorraine, on 1 January 2016 under the provisional name of Alsace-Champagne-Ardenne-Lorraine (pronounced [alzas ʃɑ̃paɲ aʁdɛn lɔʁɛn]; ACAL or, less commonly, ALCALIA), as a result of territorial reform which had been passed by the French Parliament in 2014.

The region sits astride three water basins (Seine, Meuse and Rhine), spanning an area of 57,433 km (22,175 sq mi), the fifth largest in France; it includes two mountain ranges (Vosges and Ardennes). It shares borders with Belgium, Luxembourg, Germany and Switzerland. As of 2021, it had a population of 5,561,287 inhabitants. The prefecture and largest city is Strasbourg.

Eupen (German: [ˈɔʏpn̩] , French: [øpɛn] , Dutch: [ˈøːpə(n)] ; Ripuarian: Ööpe [ˈøːpə]; Walloon: Neyåw [nɛjɑːw]; former French: Néau [neo]) is the capital of German-speaking Community of Belgium and is a city and municipality in the Belgian province of Liège, 15 kilometres (9 miles) from the German border (Aachen), from the Dutch border (Maastricht) and from the "High Fens" nature reserve (Ardennes). The town is also the capital of the Euroregion Meuse-Rhine.

First mentioned in 1213 as belonging to the Duchy of Limburg, possession of Eupen passed to Brabant, Burgundy, the Holy Roman Empire and France before being given in 1815 to Prussia, which became part of the new German Empire in 1871. In 1919, after the First World War, the Treaty of Versailles transferred Eupen and the nearby municipality of Malmedy from Germany to Belgium.

The Sauer (German and Luxembourgish, German pronunciation: [ˈzaʊɐ] , Luxembourgish: [ˈzɑʊ̯ɐ] ) or Sûre (French, French pronunciation: [syʁ] ) is a river in Belgium, Luxembourg and Germany. A left tributary of the Moselle, its total length is 173 kilometres (107 mi).

Rising near Vaux-sur-Sûre in the Ardennes in southeastern Belgium, the Sauer flows eastwards and becomes the border with Luxembourg near Martelange. It forms the border between Belgium and Luxembourg for 13 kilometres (8 mi) north of Martelange. West of Esch-sur-Sûre it flows into an artificial lake, the Upper Sûre Lake created by the Esch-sur-Sûre Dam, which gives its (French) name to the Luxembourgish commune of Lac de la Haute-Sûre. After flowing through Ettelbruck and Diekirch, the Sauer forms the border between Luxembourg and Germany for the last 50 kilometres (31 mi) of its course, passing Echternach before emptying into the Moselle in Wasserbillig. The rivers Wiltz, Alzette, White Ernz, Black Ernz, Our, and Prüm are tributaries.

Siegfried (or Sigfried) (c. 922 – 28 October 998) was count in the Ardennes, and is known in European historiography as founder and first ruler of the Castle of Luxembourg in 963 AD, and ancestor and predecessor of the future counts and dukes of Luxembourg. He was also an advocate of the abbeys of St. Maximin in Trier and Saint Willibrord in Echternach.

His male-line descendants are known as the House of Luxembourg, or House of Ardenne–Luxembourg.

The Treveri (Gaulish: *Treweroi) were a Germanic or Celtic tribe of the Belgae group who inhabited the lower valley of the Moselle in modern day Germany from around 150 BCE, if not earlier, until their displacement by the Franks. Their domain lay within the southern fringes of the Silva Arduenna (Ardennes Forest), a part of the vast Silva Carbonaria, in what are now Luxembourg, southeastern Belgium and western Germany; its centre was the city of Augusta Treverorum (Trier), to which the Treveri give their name. Celtic in language, according to Tacitus they claimed Germanic descent. They contained both Gallic and Germanic influences.

Although early adopters of Roman material culture, the Treveri had a chequered relationship with Roman power. Their leader Indutiomarus led them in revolt against Julius Caesar during the Gallic Wars; much later, they played a key role in the Gaulish revolt during the Year of the Four Emperors. On the other hand, the Treveri supplied the Roman army with some of its most famous cavalry, and the city of Augusta Treverorum was home for a time to the family of Germanicus, including the future emperor Gaius (Caligula). During the Crisis of the Third Century, the territory of the Treveri was overrun by Germanic Alamanni and Franks and later formed part of the Gallic Empire.