The 2nd Lithuanian–Belarusian Division was a unit of the Polish Army formed in July 1919 from parts of the 1st Lithuanian–Belarusian Division during the Polish–Soviet War. The division suffered heavy casualties during the Soviet invasion in summer 1920; some soldiers were forced to retreat into Lithuania

Lithuania

Lithuania , officially the Republic of Lithuania is a country in Northern Europe, the biggest of the three Baltic states. It is situated along the southeastern shore of the Baltic Sea, whereby to the west lie Sweden and Denmark...

n territory were they were interned. The division was soon recreated and renamed to the 20th Infantry Division

20th Infantry Division (Poland)

20th Infantry Division was a unit of the Polish Army during the interbellum period, which took part in the Polish September Campaign. It was formed in 1920 from the reorganization of the 2nd Lithuanian-Belarusian Division...

. It temporarily returned to the old name after Żeligowski's Mutiny

Zeligowski's Mutiny

Żeligowski's Mutiny was a sham mutiny led by Polish General Lucjan Żeligowski in October 1920, which resulted in the creation of the short-lived Republic of Central Lithuania. Polish Chief of State Józef Piłsudski had surreptitiously ordered Żeligowski to carry out the operation, and revealed the...

, when it became part of the military of the Republic of Central Lithuania

Republic of Central Lithuania

The Republic of Central Lithuania or Middle Lithuania , or simply Central Lithuania , was a short-lived political entity, which did not gain international recognition...

.