Soviet westward offensive of 1918–1919The Soviet westward offensive of 1918–1919 was part of the campaign by Soviet Russia into areas abandoned by the Ober Ost garrisons that were being withdrawn to Germany following that country's defeat in World War I. The initially successful offensive against the Republic of Estonia ignited the Estonian War of Independence which ended with the Soviet recognition of Estonia. Similarly, the campaigns against the Republic of Latvia and Republic of Lithuania ultimately failed, resulting in the Latvian–Soviet Peace Treaty and Soviet–Lithuanian Peace Treaty respectively.
Brest, BelarusBrest, formerly Brest-Litovsk and Brest-on-the-Bug, is a city in Belarus at the border with Poland opposite the Polish city of Terespol, where the Bug and Mukhavets rivers meet, making it a border town. It serves as the administrative center of Brest Region and Brest District, though it is administratively separated from the district. As of 2023, it has a population of 342,461. Brest is a historical site for many cultures, as it hosted important historical events, such as the Union of Brest and Treaty of Brest-Litovsk.
Ukrainian War of IndependenceThe Ukrainian War of Independence was a military conflict involving many parties from 1917 to 1921 which saw the establishment and development of an independent Ukrainian republic, most of which was later absorbed into the Soviet Union as the Ukrainian Soviet Socialist Republic of 1922–1991. The war consisted of military conflicts between different governmental, political and military forces. Belligerents included Ukrainian nationalists, Ukrainian anarchists, the forces of Germany and Austria-Hungary, the White Russian Volunteer Army, and Second Polish Republic forces.
Green armiesThe Green armies (Зеленоармейцы), also known as the Green Army (Зелёная Армия) or Greens (Зелёные), were armed peasant groups which fought against all governments in the Russian Civil War from 1917 to 1922. The Green armies were semi-organized local militias that opposed the Bolsheviks, Whites, and foreign interventionists, and fought to protect their communities from requisitions or reprisals carried out by third parties. The Green armies were politically and ideologically neutral, but at times associated with the Socialist-Revolutionary Party.
KresyEastern Borderlands (Kresy Wschodnie) or simply Borderlands (Kresy, ˈkrɛsɨ) was a term coined for the eastern part of the Second Polish Republic during the interwar period (1918–1939). Largely agricultural and extensively multi-ethnic, it amounted to nearly half of the territory of pre-war Poland. Historically situated in the eastern Polish–Lithuanian Commonwealth, following the 18th-century foreign partitions it was divided between the Russian Empire and the Austro-Hungarian Empire, and ceded to Poland in 1921 after the Peace of Riga.
Battle of the Niemen RiverThe Battle of the Niemen River (sometimes referred to as the Second Battle of Grodno) was the second-greatest battle of the Polish–Soviet War. It took place near the middle Neman River between the cities of Suwałki, Grodno and Białystok. After suffering almost complete defeat in the Battle of Warsaw (August 1920), Mikhail Tukhachevsky's Red Army forces tried to establish a defensive line, against Józef Piłsudski's counter-attacking Polish Army, running northward from the Polish-Lithuanian border to Polesie, and centering on Grodno.
Lithuanian Wars of IndependenceThe Lithuanian Wars of Independence, also known as the Freedom Struggles (Laisvės kovos), refer to three wars Lithuania fought defending its independence at the end of World War I: with Bolshevik forces (December 1918 – August 1919), Bermontians (June 1919 – December 1919), and Poland (August 1920 – November 1920). The wars delayed international recognition of independent Lithuania and the formation of civil institutions. After the Partitions of the Polish–Lithuanian Commonwealth in 1795, the Grand Duchy of Lithuania was annexed by the Russian Empire.
Former eastern territories of GermanyThe "former eastern territories of Germany" (Ehemalige deutsche Ostgebiete) refer in present-day Germany to those territories east of the current eastern border of Germany i.e. the Oder–Neisse line which historically had been considered German and which were annexed by Poland and the Soviet Union after World War II in Europe. In many of these territories, Germans used to be the dominant or sole ethnicity.
IntermariumIntermarium (Międzymorze, mjɛnd͡zɨˈmɔʐɛ) was a post-World War I geopolitical plan conceived by Józef Piłsudski to unite former Polish–Lithuanian Commonwealth lands within a single polity. The plan went through several iterations, some of which anticipated the inclusion as well of other, neighboring states. The proposed multinational polity would have incorporated territories lying between the Baltic, Black and Adriatic Seas, hence the name Intermarium (Latin for "Between-Seas").
Polish population transfers (1944–1946)The Polish population transfers in 1944–1946 from the eastern half of prewar Poland (also known as the expulsions of Poles from the Kresy macroregion), were the forced migrations of Poles toward the end and in the aftermath of World War II. These were the result of a Soviet Union policy that had been ratified by the main Allies of World War II. Similarly, the Soviet Union had enforced policies between 1939 and 1941 which targeted and expelled ethnic Poles residing in the Soviet zone of occupation following the Nazi-Soviet invasion of Poland.
