Rubuta ci gaba don wannan sakin layi - A ranar 1 ga Agusta, 1919, rundunar ta koma gaban gaba a matsayin wani ɓangare na 14th Greater Poland Infantry Division (). Rundunar ta yi yaƙin neman zaɓe ta hanyar Maladzyechna, Małe Gajany, Minsk, Ihumen, Bochuczewicze da Babruysk, wanda aka kama a ranar 28 ga Agusta. Babruysk ya zama tushen rundunar a lokacin yaƙe-yaƙe a kwarin Kogin Berezina da Polesia har zuwa Mayu 1920. A wannan lokacin, sojojin Soviet sun yi wa rundunar lakabi "" (), saboda launin ja a kan rogatywkas. A watan Mayu na 1920 rundunar ta shiga cikin dakatar da hare-haren sojojin Soviet na 16, tare da ɗaukar sojoji da yawa daga brigade na sojan Soviet a matsayin fursunoni. A watan Yunin 1920, saboda hare-haren Soviet na gaba, an tilasta wa rundunar komawa baya. A lokacin yaƙe-yaƙe kusa da Ivachnoviche, a ranar 29 ga Yuli, CO na rundunar, LtCol. Władysław Anders, ya ji rauni. A matsayin wani ɓangare na yunkurin adawa da Yaren mutanen Poland, rundunar ta keta layin Soviet a ranar 16 ga watan Agusta, kusa da Maciejowice. Daga baya wannan rundunar ta shiga cikin yakin kogin Niemen.
Ka yi haƙuri. A rabi na biyu na Satumba 1920 doki ya shiga cikin fadace-fadace kusa da Mezhiritch, Zelva da Snovy. Birni na ƙarshe da rundunar ta kama shi ne Minsk, daga inda aka janye rukunin bayan tsagaita wuta. A ranar 16 ga Janairu, 1921, rundunar ta koma Poznań a karkashin jagorancin Władysław Anders. Don ƙarfin hali a lokacin yakin, dukkanin rundunonin na 14th sun sami Virtuti Militari. Marsh ya yi ado da launuka na naúrar. Józef Piłsudski a ranar 22 ga Afrilu 1921.