Mezue ahịrịokwu na-esonụ: N'abalị iri na isii n'ọnwa Ọgọstụ n'afọ 1920, n'oge agha nke Warsaw, e kenyere ya ọrụ dịka onye isi ndị ọrụ nke Polish 4th Cavalry Brigade, nke mechara bụrụ isi nke ndị a na-akpọ "Nieniewski's Operational Group" n'oge agha ahụ.
Agha Osimiri Niemen. 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.