4th Rifle Division (Poland)
The Polish 4th Rifle Division (Polish: 4. Dywizja Strzelców Polskich, Russian: Полская 4-я Стрелковая Дивизия) was a Polish military unit, forming, together with the Polish 5th Rifle Division of the Blue Army, the only part of the Polish military which took part in the Russian Civil War.
Source: Wikipedia — 4th Rifle Division (Poland) (CC BY-SA 4.0)