First Battle of the Marne in the context of "Triple Entente"

World War I, or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a global conflict between two coalitions: the Allies (or Entente) and the Central Powers. Major areas of conflict included Europe and the Middle East, as well as parts of Africa and the Asia-Pacific. The war saw important developments in weaponry including tanks, aircraft, artillery, machine guns, and chemical weapons. One of the deadliest conflicts in history, it resulted in an estimated 30 million military casualties, and 8 million civilian deaths from war-related causes and genocide. The movement of large numbers of people was a major factor in the deadly Spanish flu pandemic.

The causes of World War I included the rise of the German Empire and decline of the Ottoman Empire, which disturbed the long-standing balance of power in Europe, the exacerbation of imperial rivalries, and an arms race between the great powers. Growing tensions in the Balkans reached a breaking point on 28 June 1914 when Gavrilo Princip, a Bosnian Serb, assassinated Franz Ferdinand, the heir to the Austro-Hungarian throne. Austria-Hungary blamed Serbia, and declared war on 28 July. After Russia mobilised in Serbia's defence, Germany declared war on Russia and France, who had an alliance. The United Kingdom entered the war after Germany invaded Belgium, and the Ottoman Empire joined the Central Powers in November. Germany's strategy in 1914 was to quickly defeat France before transferring its forces to the east, but its advance was halted in September, and by the end of the year the Western Front consisted of a near-continuous line of trenches from the English Channel to Switzerland. The Eastern Front was more dynamic, but neither side gained a decisive advantage, despite costly offensives. Italy, Bulgaria, Romania, Greece and others entered the war from 1915 onward.

Marc Léopold Benjamin Bloch (/blɒk/ BLOCK; French: [maʁk leɔpɔld bɛ̃ʒamɛ̃ blɔk]; 6 July 1886 – 16 June 1944) was a French historian. He was a founding member of the Annales School of French social history. Bloch specialised in medieval history and published widely on medieval France over the course of his career. As an academic, he worked at the University of Strasbourg (1920 to 1936 and 1940 to 1941), the University of Paris (1936 to 1939), and the University of Montpellier (1941 to 1944).

Born in Lyon to an Alsatian Jewish family, Bloch was raised in Paris, where his father—the classical historian Gustave Bloch—worked at Sorbonne University. Bloch was educated at various Parisian lycées and the École Normale Supérieure, and from an early age was affected by the antisemitism of the Dreyfus affair. During the First World War, he served in the French Army and fought at the First Battle of the Marne and the Somme. After the war, he was awarded his doctorate in 1918 and became a lecturer at the University of Strasbourg. There, he formed an intellectual partnership with modern historian Lucien Febvre. Together they founded the Annales School and began publishing the journal Annales d'histoire économique et sociale in 1929. Bloch was a modernist in his historiographical approach, and repeatedly emphasised the importance of a multidisciplinary engagement towards history, particularly blending his research with that on geography, sociology and economics, which was his subject when he was offered a post at the University of Paris in 1936.

The Schlieffen Plan (German: Schlieffen-Plan, pronounced [ʃliːfən plaːn]) is a name given after the First World War to German war plans, due to the influence of Field Marshal Alfred von Schlieffen and his thinking on an invasion of France and Belgium, which began on 4 August 1914. Schlieffen was Chief of the General Staff of the German Army from 1891 to 1906. In 1905 and 1906, Schlieffen devised an army deployment plan for a decisive (war-winning) offensive against France. German forces were to invade France through the Netherlands, Luxembourg and Belgium rather than across the common border.

After losing the First World War, the German official historians of the Reichsarchiv and other writers, described the plan as a blueprint for victory. Generaloberst (Colonel-General) Helmuth von Moltke the Younger had succeeded Schlieffen as Chief of the German General Staff in 1906 and was dismissed after the First Battle of the Marne (5–12 September 1914). German historians claimed that Moltke had ruined the plan by tampering with it, out of timidity. They managed to establish a narrative that Moltke failed to follow the blueprint devised by Schlieffen, condemning the belligerents to four years of attrition warfare.

The Western Front was one of the main theatres of war during World War I. Following the outbreak of war in August 1914, the German Army opened the Western Front by invading Luxembourg and Belgium, then gaining military control of important industrial regions in France. The German advance was halted with the Battle of the Marne. Following the Race to the Sea, both sides dug in along a meandering line of fortified trenches, stretching from the North Sea to the Swiss frontier with France, the position of which changed little except during early 1917 and again in 1918.

Between 1915 and 1917 there were several offensives along this front. The attacks employed massive artillery bombardments and massed infantry advances. Entrenchments, machine gun emplacements, barbed wire, and artillery repeatedly inflicted severe casualties during attacks and counter-attacks and no significant advances were made. Among the most costly of these offensives were the Battle of Verdun, in 1916, with a combined 700,000 casualties, the Battle of the Somme, also in 1916, with over a million casualties, and the Battle of Passchendaele, in 1917, with 487,000 casualties.

Graf Helmuth Johannes Ludwig von Moltke (German: [ˈhɛlmuːt fɔn ˈmɔltkə]; 25 May 1848 – 18 June 1916), also known as Moltke the Younger, was a German general and Chief of the Great German General Staff, a member of the House of Moltke. He was also the nephew of Generalfeldmarschall Graf Helmuth von Moltke the Elder, who is commonly called "Moltke the Elder" to differentiate the two.

Upon becoming the head of the General Staff, Moltke led the German Army from 1 January 1906 to 14 September 1914 during the opening months of World War I. His legacy remains a matter of controversy, due to his involvement in Germany's decision to go to war and in the execution of the invasion of France and Belgium that culminated in the First Battle of the Marne.

The Ninth Army (French: IXe Armée) was a field army of the French Army during World War I and World War II.

The Ninth Army, first named "détachement d'armée Foch", was formed for the first time on 29 August 1914, to fill the gap between the Fourth and Fifth Army. It played an important role in the first Battle of the Marne. The Ninth Army was disbanded on 5 October 1914, when Foch became commander of Army Group North.

Ferdinand Foch (/fɒʃ/ FOSH, French: [fɛʁdinɑ̃ fɔʃ]; 2 October 1851 – 20 March 1929) was a French general, Marshal of France and a member of the Académie Française and Académie des Sciences. He distinguished himself as Supreme Allied Commander on the Western Front during the First World War in 1918.

A commander during the First Marne, Flanders and Artois campaigns of 1914–1916, Foch became Supreme Allied Commander in late March 1918 in the face of the all-out German spring offensive. He successfully coordinated the French, British and American efforts, deftly handling his strategic reserves. He stopped the German offensive and launched a war-winning counterattack. In November 1918, Marshal Foch accepted the German cessation of hostilities and was present at the Armistice of 11 November 1918.