Polish–Russian War
The cholera epidemic struck Warsaw during the Polish–Russian War 1830–31 between 16 May and 20 August 1831; 4,734 people fell ill and 2,524 died. The epidemic of cholera brought to Poland and East Prussia by Russian soldiers forced Prussian authorities to close their borders to Russian transports. "Cholera riots" occurred in Russia, caused by the anticholera measures undertaken by the tsarist government.