Pedzisa mutsara unotevera: Musi waAugust 16, 1920, panguva yeHondo yeWarsaw, akapiwa basa semukuru mukuru wePolish 4th Cavalry Brigade, iyo yakazova musimboti weanonzi "Nieniewski's Operational Group" panguva ye
Hondo yeRwizi rweNiemen. Mushure mekuguma kwehondo dzePolish-Soviet War, Nieniewski akapedza kudzidza paGeneral's Course uye musi waNdira 10, 1921, akasimudzirwa kuva Colonel weCavalry.