 Complete the following phrase:  After the conclusion of the Polish-Soviet War, Bortnowski traveled to Paris, France, where he began training at the Ecole Superieure de Guerre on November 1, 1920. In September 1922, he graduated and returned to Poland where he received further training at various posts, notably in the staff of the Army Inspectorate in Wilno modern Vilnius, Lithuania. On August 15, 1924, he was promoted to the rank of Colonel and in October of the following year, he became the commanding officer of the Kutno-based 37th Infantry Regiment. After the 