Adam Nieniewski

In 1907 he was promoted to cavalry ensign and assigned to the 6th Uhlans Regiment, where he served as a platoon and then squadron commander.

In July 1914, during the mobilisation preceding the outbreak of the Great War, he was assigned to the Imperial General Staff.

On May 23, 1916, he was assigned to the headquarters of Piłsudski's Polish Legions, where he served as the deputy chief of staff and was soon promoted to major (on December 1, 1916).

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.

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 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.