Great Retreat

The Great Retreat also known as the retreat from Mons, took place in the First World War. The retreat was more than 200 km (120 mi), from Belgium to the River Marne in France in August and September 1914. The French Fifth Army and the British Expeditionary Force had been defeated by the armies of the German Empire at the Battle of Charleroi (21 August) and the Battle of Mons (23 August). A counter-offensive by the Fifth Army, with some assistance from the BEF, at the First Battle of Guise (Battle of St. Quentin, 29–30 August) failed to halt the German advance. The retreat of the Fifth Army and the BEF continued to the south side of the Marne River. From 5 to 12 September, the First Battle of the Marne ended the Allied retreat and forced the German armies to retire towards the Aisne River and to fight the First Battle of the Aisne (13–28 September). Reciprocal attempts to outflank the opposing armies to the north known as the Race to the Sea followed from 17 September to 17 October.