The Russian Civil War took a toll on the city. Wartime epidemics, especially that of typhus and cholera, claimed thousands of lives. In the course of the war, the Ob River Bridge was destroyed. For the first time in the city's history, the population of Novonikolayevsk began to decline. The Soviet Workers' and Soldiers' Deputies of Novonikolayevsk took control of the city in December 1917. In May 1918, the Czechoslovak Legion rose in opposition to the revolutionary government and, together with the White Guards, captured Novonikolayevsk. The Red Army took the city in 1919, retaining it throughout the rest of the Civil War.