In May 1919, the city of Petrograd, the Bolsheviks' stronghold in Russia, is attacked by the counter-revolutionary White Army of General Nikolai Yudenich, who is supported by the imperialist British, and especially by the warmongering Winston Churchill. The city's High Soviet is demoralized and about to order an evacuation, while the White fifth column inside it plots an insurrection. The Krasnaya Gorka fort dispatches a detachment of Baltic Fleet sailors to assist Petrograd, among them the young Vladimir Shibaev. As the Red Army faces defeat by the Whites, Joseph Stalin arrives on the battlefield, rallies the communists and routs the enemy, saving the city.