The 2nd Army Corps took part in the Battle of Tannenberg,  fought between Russia and Germany from 26–30 August 1914, during the first month of what war?
2nd Army Corps (Russian Empire): The 2nd Army Corps (Russian: 2-й армейский корпус ) was a formation in the Imperial Russian Army that was active during World War I. Battle of Tannenberg: The Battle of Tannenberg was fought between Russia and Germany from 26–30 August 1914, during the first month of World War I.
i don't know