Russia's involvement in World War I led to catastrophic losses and societal upheaval. The Eastern Front saw massive battles and troop movements, with Russia initially taking the offensive against Germany and Austria-Hungary. However, poor leadership, inadequate supplies, and mounting casualties took their toll. As the war dragged on, Russia's economy and society crumbled under the strain. Food shortages, inflation, and political unrest grew. By 1917, the Tsarist regime collapsed, giving way to revolution. The Bolsheviks seized power, ending Russia's participation in the war and ushering in the Soviet era.