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Second Battle of the Marne
Part of the Western Front of World War I
Date 15 July – 6 August 1918 Location Marne River near Paris, France Result Allied victory
Combatants
France  United Kingdom  United States	German Empire
Casualties
125,000 (95,000 French - 13,000 British - 12,000 American)	168,000

The Second Battle of the Marne, or Battle of Reims, was a major World War I battle fought from July 15 to August 5, 1918, near the Marne River. It was the last major German offensive in the Western Front, and failed when an Allied counterattack led by French forces overwhelmed the Germans, inflicting severe casualties.

Following the failures of the Spring Offensive to end the war, Erich Ludendorff, Chief Quartermaster-General and virtual military ruler of Germany, believed that an attack through Flanders would give Germany a decisive victory over the British Expeditionary Force (BEF), the most potent Allied force on the Western Front at that time. To shield his intentions and draw Allied troops away from Belgium, Ludendorff planned for a large diversionary attack along the Marne.

The battle began on July 15 when 23 German divisions of the First and Third armies, led by Mudra and Karl von Einem, assaulted the French Fourth Army under General Gouraud east of Reims. Meanwhile, 17 divisions of the German Seventh Army, under Boehm, aided by the Ninth Army under Eben, attacked the French Sixth Army led by Degoutte to the west of Reims. Ludendorff hoped to split the French in two.

Large numbers of British soldiers and 85,000 American troops joined the French for the battle. The German attack to the east of Reims was stopped on the first day, but the attack to the west broke through the French Sixth Army and advanced nine miles before the French Ninth Army, helped by American, British, and Italian troops, stalled the advance on July 17.

The German failure to break through prompted Ferdinand Foch, the Allied Supreme Commander, to authorize a major counter-offensive on July 18; 24 French divisions, joined by other Allied troops including 8 large US divisions, and 350 tanks attacked the recently formed German salient. The French were entirely successful, with Mangin's Tenth Army and Degoutte's Sixth Army advancing five miles on the first day alone. Berthelot's Fifth Army and Eben's Ninth Army launched additional attacks in the west. The Germans ordered a retreat on July 20 and were forced all the way back to the positions where they had started their Spring Offensives earlier in the year. The Allied counterattack petered out on August 6 when well-entrenched German troops ground it to a halt.

The disastrous German defeat led to the cancellation of Ludendorff's planned invasion of Flanders and was the first step in a series of Allied victories that ended the war.

• First Battle of the Marne

• Greenwood, Paul The Second Battle of the Marne 1918 Shrewsbury: Airlife 1998
• Skirrow, Fraser Massacre on the Marne: The Life and Death of the 2/5th Battalion West Yorkshire Regiment in the Great War Pen & Sword Military (22 Mar 2007) ISBN-10: 1844154963 ISBN-13: 978-1844154968

• The Second Battle of the Marne, 1918
• British 62nd Division's part in the events