Whakaotihia te rerenga e whai ake nei: I te whakaoho, i whakawhiwhia te XX Corps ki te 8th Army ki te tiaki i te Rawhiti o Prussia i te wa i mahia ai e te toenga o te ope taua te whakaeke a Schlieffen Plan i Akuhata 1914. I uru ia ki nga pakanga o Gumbinnen, Tannenberg me te 1st Masurian Lakes. I muri tonu i te 1st Masurian Lakes ka uru atu ia ki te 9th Army i Lower Silesia i reira i whawhai ai i te
Te Pakanga o te awa o Vistula. I te marama o Mei 1915 i hoki mai ki te 8 o nga ope taua, a i te 26 o Mei ko te rangatira o te XX Corps, General der Artillerie Friedrich von Scholtz, te rangatira o te ope taua, i te wa e pupuri ana i te whakahau o tana Corps. I te 29 o Hepetema 1915, i whakakorehia te tari matua o te 8 Army. I te 18 o Hepetema 1915, i whakahoutia te XX Corps ki te hanga "Armee-Gruppe" Scholtz, i muri mai ko "Armee-Abteilung" Scholtz, hei waahanga o te Ope Taua o Niemen.