Dee ihe na-aga n'ihu maka paragraf a - Na Ọgọst 16, 1920, n'oge Agha nke Warsaw, e kenyere ya ọrụ dị ka onye isi ndị Polish 4th Cavalry Brigade, nke mechara bụrụ isi nke ihe a na-akpọ "Nieniewski's Operational Group" n'oge Agha nke Osimiri Niemen
Ọ dị mma. Mgbe njedebe nke agha nke agha Polish-Soviet, Nieniewski gụsịrị akwụkwọ na General's Course na Jenụwarị 10, 1921, e buliri ya n'ọkwa nke Colonel nke Cavalry.