Dee ihe na-aga n'ihu maka paragraf a - Nnukwu ịlaghachi azụ (Great Retreat), nke a makwaara dị ka ịlaghachi azụ site na Mons, bụ ogologo ịla azụ na Osimiri Marne na August na Septemba 1914 site na British Expeditionary Force (BEF) na French Fifth Army. Ndị agha France na Britain nọ n'Ebe Ọdịda Anyanwụ Ụwa n'Agha Ụwa Mbụ meriri ndị agha nke Alaeze Ukwu Germany n'Agha Charleroi.
(Ọgọstụ 21) na Agha Mons (Ọgọstụ 23). Ndị agha nke ise, na enyemaka ụfọdụ sitere na BEF, na Agha Mbụ nke Guise (Agha nke St. Quentin) enweghị ike ịkwụsị ọganihu ndị Germany na ịlaghachi azụ gara n'ihu na Marne. Site na 5 ruo 12 Septemba, Agha Mbụ nke Marne kwụsịrị ịlaghachi azụ nke ndị Allied ma mee ka ndị agha Germany laghachi azụ n'akụkụ Osimiri Aisne ma lụọ Agha Mbụ nke Aisne. Mgbalị ndị ọzọ a na-eme iji merie ndị agha na-emegide ha n'ebe ugwu nke a maara dị ka Ọsọ na Oké Osimiri na-esote site na