Question: In September 1914, during the conflict in which Elwyn Roy King served, where was the initial German offensive on the Western Front stopped?

full_context: Document 1: Arthur Whealy: Arthur Treloar Whealy DSC & Bar DFC (2 November 1895 – 23 December 1945) was a Canadian First World War flying ace, officially credited with 27 victories.
Document 2: British Expeditionary Force (World War II): The BEF (General Lord Gort) began moving to France in September 1939. The British assembled along the Belgian -- French border on the left of the French First Army as part of the French 1er groupe d'armées (1st Army Group) of the Front du Nord - est (North - Eastern Front). Most of the BEF spent the Phoney War digging field defences on the French -- Belgian border, before the Battle of France (Fall Gelb) began on 10 May 1940. The BEF constituted 10 percent of the Allied forces on the Western Front. The BEF participated in the Dyle Plan, a rapid advance into Belgium to the line of the river Dyle but had to retreat through Belgium and north - western France with the rest of the 1er groupe d'armées, after the German breakthrough further south at the Battle of Sedan. The BEF, French and Belgian forces cut off north of the Somme river were evacuated from the French North Sea coast through port and beaches of Dunkirk in Operation Dynamo.
Document 3: Franco-Prussian War: On 10 October, hostilities began between German and French republican forces near Orléans. At first, the Germans were victorious but the French drew reinforcements and defeated the Germans at the Battle of Coulmiers on 9 November. After the surrender of Metz, more than 100,000 well-trained and experienced German troops joined the German 'Southern Army'. The French were forced to abandon Orléans on 4 December, and were finally defeated at the Battle of Le Mans (10–12 January). A second French army which operated north of Paris was turned back at the Battle of Amiens (27 November), the Battle of Bapaume (3 January 1871) and the Battle of St. Quentin (13 January).
Document 4: Harry Robinson (RAF officer): Flight Lieutenant Harry Noel Cornforth Robinson (25 December 1898 – 2 June 1926) was a British World War I flying ace credited with 10 aerial victories. After winning the Military Cross and "Croix de guerre", he remained in service post-war, winning the Distinguished Flying Cross in Iraq.
Document 5: Oswald Watt: In his will, Watt left two bequests to the Australian Aero Club, one of which was used to establish the Oswald Watt Gold Medal for outstanding achievement in Australian aviation. Winners of the award have included Charles Kingsford Smith, Bert Hinkler, Henry Millicer, Ivor McIntyre, Jon Johanson and Andy Thomas. He also bequeathed a sum to the Royal Military College, Duntroon, to award annually a set of binoculars for the best cadet essay on military aviation or aeronautics. The award was founded as the Oswald Watt Prize later in 1921. Most of the residue of Watt's estate went to the University of Sydney. Considered one of the university's great benefactors, he was commemorated by the Oswald Watt Fund. In May 1923, the Oswald Watt Wing of the Havilah Home for Orphans, Wahroonga, was opened by the Governor-General of Australia. Watt was acknowledged as both a source and a reviewer by F.M. Cutlack in the latter's volume on the Australian Flying Corps that was first published in 1923 as part of the "Official History of Australia in the War of 1914–1918". During World War I, Oswald Watt had been the only AFC officer to command a wing apart from Lieutenant Colonel Richard Williams, who was later to become known as the "Father of the RAAF". In 2001, military historian Alan Stephens noted that "had fate drawn him to a post-war career in the Air Force instead of to business and an untimely death, 'Toby' Watt might have challenged Richard Williams as the RAAF's dominant figure in its formative years".
Document 6: First Battle of the Marne: The Battle of the Marne (French: Première bataille de la Marne, also known as the Miracle of the Marne, Le Miracle de la Marne) was a World War I battle fought from 6 -- 10 September 1914. It resulted in an Allied victory against the German armies in the west. The battle was the culmination of the German advance into France and pursuit of the Allied armies which followed the Battle of the Frontiers in August and had reached the eastern outskirts of Paris. A counter-attack by six French armies and the British Expeditionary Force (BEF) along the Marne River forced the Imperial German Army to retreat north - west, leading to the First Battle of the Aisne and the Race to the Sea. The battle was a victory for the Allied Powers but led to four years of trench warfare stalemate on the Western Front.
Document 7: Western Front (World War I): The German Army came within 70 km (43 mi) of Paris but at the First Battle of the Marne (6 -- 12 September), French and British troops were able to force a German retreat by exploiting a gap which appeared between the 1st and 2nd Armies, ending the German advance into France. The German Army retreated north of the Aisne River and dug in there, establishing the beginnings of a static western front that was to last for the next three years. Following this German retirement, the opposing forces made reciprocal outflanking manoeuvres, known as the Race for the Sea and quickly extended their trench systems from the Swiss frontier to the North Sea. The territory occupied by Germany held 64 percent of French pig - iron production, 24 percent of its steel manufacturing and 40 percent of the coal industry -- dealing a serious blow to French industry.
Document 8: Western Front (World War I): The Western Front was the main theatre of war during the First World War. 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 tide of the advance was dramatically turned 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, which changed little except during early 1917 and in 1918.
Document 9: Royal Flying Corps: Royal Flying Corps Active 13 April 1912 -- 1 April 1918 Disbanded merged into Royal Air Force (RAF), 1918 Country British Empire Allegiance King George V Branch British Army Size 3,300 aircraft (1918) Motto (s) Latin: Per Ardua ad Astra ``Through Adversity to the Stars ''Wars First World War Commanders Notable commanders Sir David Henderson Hugh Trenchard Insignia Roundel Flag
Document 10: Cecil Roy Richards: Lieutenant Cecil Roy Richards was an Australian flying ace of World War I. He was credited with twelve aerial victories.
Document 11: Modern history: Much of the fighting in World War I took place along the Western Front, within a system of opposing manned trenches and fortifications (separated by a "No man's land") running from the North Sea to the border of Switzerland. On the Eastern Front, the vast eastern plains and limited rail network prevented a trench warfare stalemate from developing, although the scale of the conflict was just as large. Hostilities also occurred on and under the sea and—for the first time—from the air. More than 9 million soldiers died on the various battlefields, and nearly that many more in the participating countries' home fronts on account of food shortages and genocide committed under the cover of various civil wars and internal conflicts. Notably, more people died of the worldwide influenza outbreak at the end of the war and shortly after than died in the hostilities. The unsanitary conditions engendered by the war, severe overcrowding in barracks, wartime propaganda interfering with public health warnings, and migration of so many soldiers around the world helped the outbreak become a pandemic.
Document 12: Bruce Digby-Worsley: Second Lieutenant Bruce Digby-Worsley was a World War I British flying ace credited with 16 aerial victories between June and September 1918.
Document 13: Edward Gribben: Edward Gribben was a World War I flying ace credited with five aerial victories. He became a lieutenant-colonel in the Territorial Army between the wars, returning to the RAF in World War II, and rising to the rank of squadron leader.
Document 14: Elwyn Roy King: Elwyn Roy King, DSO, DFC (13 May 1894 – 28 November 1941) was a fighter ace in the Australian Flying Corps (AFC) during World War I. He achieved twenty-six victories in aerial combat, making him the fourth highest-scoring Australian pilot of the war, and second only to Harry Cobby in the AFC. A civil pilot and engineer between the wars, he served in the Royal Australian Air Force (RAAF) from 1939 until his death.
Document 15: Franco-Prussian War: While the republican government was amenable to war reparations or ceding colonial territories in Africa or in South East Asia to Prussia, Favre on behalf of the Government of National Defense, declared on 6 September that France would not "yield an inch of its territory nor a stone of its fortresses." The republic then renewed the declaration of war, called for recruits in all parts of the country and pledged to drive the German troops out of France by a guerre à outrance. Under these circumstances, the Germans had to continue the war, yet could not pin down any proper military opposition in their vicinity. As the bulk of the remaining French armies were digging-in near Paris, the German leaders decided to put pressure upon the enemy by attacking Paris. By September 15, German troops reached the outskirts of the fortified city. On September 19, the Germans surrounded it and erected a blockade, as already established at Metz.
ground_truth: First Battle of the Marne
sub_queries: Elwyn Roy King >> conflict Answer: World War
where was the initial german offensive on World War i western front stopped in september 1914 Answer: First Battle of the Marne