The Battle of Lake Baikal was fought between the Czechoslovak legion and the Red Army

Czechoslovak Legion fought battle near Baikal, securing their control over local port and section of Transsiberian Railway.

The Czechoslovak Legion (Československé legie in Czech, Československé légie in Slovak) or Czech legion were volunteer armed forces composed predominantly of Czechs with a small amount of Slovaks (approximately 8 percent [1]) fighting together with the Entente powers during World War I. The name "Czechoslovak" originated after the war. Their goal was to win the Allies' support for the independence of Bohemia and Moravia from the Austrian Empire and of Slovak territories from the Kingdom of Hungary, which were then part of the Austro-Hungarian Empire. With the help of émigré intellectuals and politicians such as Tomáš Garrigue Masaryk and Milan Rastislav Štefánik, they grew into a force of tens of thousands.

In Russia, they took part in several battles of the war, including the Zborov and Bakhmach against the Central Powers, and were heavily involved in the Russian Civil War fighting Bolsheviks, at times controlling the entire Trans-Siberian railway and several major cities in Siberia.

The total number of persons evacuated with the Czechoslovak Legion in Russia was 67,739; including 56,455 soldiers, 3,004 officers, 6,714 civilians, 1,716 wives, 717 children, 1,935 foreigners and 198 others.