Battle of Warsaw, he was assigned as the commanding officer of Polish 4th Cavalry Brigade, which later became the core of the so-called Nieniewski's Operational Group during the Battle of the Niemen River. After the end of hostilities of the Polish–Soviet War, Nieniewski graduated from a Generals' Course and on January 10, 1921, he was promoted to Colonel of Cavalry. Between May 18 and September 25, 1921, he commanded the VII Infantry Brigade. After it was disbanded, he continued to command its troops within the 7th Infantry Division. In 1925 he briefly held the post of the deputy rector of the Higher War School, later to be renamed to the Polish Academy of the General Staff. In 1926 he was also the head of the Staff Officers Courses in the Cavalry School in Grudziądz. On January 31, 1928, he resigned all his posts and was demobilised. Retired, he withdrew to his wife's village of Chorzenice, where he lived in a local manor. During World War II he moved to a nearby village of Kłomnice, but in 1945 both these villages were confiscated by the new Soviet-backed communist authorities of Poland. In 1945 he was yet again mobilised by General Michał Rola-Żymierski and briefly served as the chief of staff of the Poznań Military Area Command, but in August of that year he was again demobilised. Adam Nieniewski died April 27, 1947, in Olsztyn. He was buried in Wróblewo near Łódź. His family manor in Chorzenice was turned into an orphanage. Decorations Silver Cross of the Virtuti Militari Officer's Cross of the Polonia Restituta - 4th Class Cross of Independence Cross of Valour (Krzyż Walecznych) - 4 times Chevalier of the Légion d'Honneur Bibliography See also Polish–Soviet War 1886 births 1947 deaths People from Sieradz County People from Kalisz Governorate Polish Austro-Hungarians Austro-Hungarian Army officers Austro-Hungarian military personnel of World War I Polish legionnaires (World War I) Polish Auxiliary Corps personnel Polish Army officers Polish people of the Polish–Soviet War Polish military personnel of World War II Recipients of the Silver Cross of the Virtuti Militari Officers of the Order of Polonia Restituta Recipients of the Cross of Independence Recipients of the Cross of Valour (Poland) Chevaliers of the Légion d'honneur