Kammala jumla mai zuwa: An kafa rundunar a cikin kaka na 1914, daga sojoji na Legion Wschodni (Eastern Legion), wanda aka rushe a ranar 21 ga Satumba, 1914, bayan da yawancin sojojinsa suka ƙi yin rantsuwa da biyayya ga Sarkin sarakuna Franz Joseph I na Austria. An ƙarfafa shi da ƙarin masu sa kai daga Silesia na Austrian da Galicia na Austrian, ya shiga cikin Yakin Galicia tun a watan Oktoba na 1914. Rundunar ta yi yaƙi a cikin manyan yaƙe-yaƙe da yawa, kamar su Yaƙin Rafajlowa, Yaƙin Mołotków, Yaƙin Kostiuchnówka, Yaƙin Rarańcza da kuma
Yaƙin Kaniów. 'Yan Jamus sun kwashe makamai bayan yakin Kaniów (Mayu 1918) sojojin Poland sun sake kirkirar su a farkon 1919. Ya yi yaƙi a cikin Yakin Poland-Ukraine (1918-19) da Yakin Poland-Soviet na 1920.