Mezue ahịrịokwu na-esonụ: Ndị agha ahụ nọ n'etiti ndị agha nke mbụ na nke abụọ n'oge mkpọsa nke East Prussian nke 17 August ruo 15 Septemba 1914, na-ekpuchi akụkụ aka ekpe nke ndị agha nke mbụ yana ndị agha nke abụọ. N'oge ndị Russia na-alaghachi azụ site na East Prussia ọ gbachitere akara nke Osimiri Bobr ma kpuchie ntụzi nke Augustów na Grodno. Ndị agha nke mbụ na nke iri kpuchiri akụkụ aka nri nke Northwestern Front n'oge
Warsaw-Ivangorod Ọrụ nke 15 Septemba ruo 25 Ọktọba. General nke ndị agha Thadeus von Sievers nọchiri Flug na 23 Septemba. N'oge ọrụ Łódź nke 29 Ọktọba ruo 11 Nọvemba, ndị agha nke ndị agha 1st na 10th kpuchiri ntụziaka Mława n'akụkụ aka nri nke Vistula. Na mwakpo nke ọzọ na East Prussia, ndị agha kwụsịrị site na ndị siri ike na ndị siri ike nke ndị Germany na Masurian Lakes ma enweghị ike ijide ha.