According to his autobiographical writing, at the time of the Bolshevik takeover of Russia in November 1917, Piasecki at age sixteen, found himself in Moscow. He saw with his own eyes the barbarity of the Bolshevik revolution, and from then on, became an avid anti-Communist. Some time in 1918 or 1919, he returned to Belarus, joining the Belarusian anti-Soviet units called Zialony Dub ("Green Oak"), led by ataman Wiaczeslaw Adamowicz. When in 1919 Polish Army troops captured Minsk in the , Adamowicz decided to cooperate with them. Thus, a Belarusian unit under Polish command was created, and soon Piasecki was transferred to Warsaw's school of infantry cadets. In the summer of 1920, Piasecki fought in the Battle of Radzymin, and this experience tied him with Poland for the rest of his life. Afterwards, he