The Pleven Siege occurred during the Russo-Turkish War from 1877 to 1878. It involved a prolonged military blockade of the Bulgarian city of Pleven by Russian and Romanian forces against the Ottoman Empire. The siege lasted from July to December 1877, with the aim of weakening Ottoman control in the region. The siege was marked by fierce fighting and significant casualties on both sides. Ultimately, the Russian and Romanian forces succeeded in capturing Pleven, which played a crucial role in the overall success of the war, leading to the eventual independence of Bulgaria from Ottoman rule.