He later joined the Polish Army Corps in Minsk. From there he was sent to Kiev and Żytomierz as he was responsible for the formation of Polish troops in Eastern Europe. In 1917, he was transferred to the Polish II Corps being formed in the area of Ukraine and became one of its organizers. From January to early February 1918 on the order of General commander Eugene de Henning Michaelis, Rómmel was in charge of all Polish troops stationing in Kiev. During this period he formed a separate Artillery III Corps consisting of three batteries, which he later commanded in Central Europe. During the Russian Civil War, he commanded the Polish Light Brigade, a part of General Żeligowski's 4th Rifle Division. Interned by Austria-Hungary, in 1918 he joined the newly established Polish Army of the Second Polish Republic governed by its Chief of State, Marshal Józef Piłsudski. The Polish-Bolshevik War and interwar years On 3 November 1918, he joined the Polish army and instantly became a colonel of the Armed Forces. With the help of his subordinates, he was responsible for the disarmament of the German troops in the city of Rembertów. He was then appointed commander of the artillery camp in Rembertów, and using the captured weapons (4 batteries of cannons) he organized and established the 8th Artillery Regiment. He attended the 3-week course at the Artillery Training Center in Warsaw. During the Polish-Soviet War between 1919 and 1920, he took part in the fighting in the Vilnius region and also was a participant in the Latvian offensive (during which he captured Dvinsk). From 17 June 1920 until 10 July he commanded the 1st Infantry Division of Legionów. Although initially a commanding officer of the 1st Legions Infantry Division he created and commanded the 1st Cavalry Division. In that post, he won a striking victory against Semyon Budyonny in the Battle of Komarów on 30 August 1920, in which Budyonny lost an estimated 4,000 men. Rómmel's victory in the largest cavalry battle in the 20th century later added to his popularity and fame in Poland. In September 1920 he also fought with distinction in the ranks of Haller's Operational Group of Sikorski's 3rd Army during the Battle of the Niemen River. After the war he published many books where he described his experiences before and following the battles in the east. From 28 February until 16 April 1921 he