Member of Polish Legions, took part in the Polish-Ukrainian War, supporter of Józef Piłsudski's May Coup, he was a deputy to Polish Sejm from BBWR in 1928 and afterwards deputy of Chief of Staff.
Member of Polish Legions, he took part in the 1918-1919 Polish-Ukrainian War and later supported the 1926 May Coup of Józef Piłsudski. Pieracki was a deputy to Polish Sejm from Non-partisan Block of Collaboration with the Government in 1928 and afterwards deputy of Chief of Staff.