Input (grade 13): In January 1920, the town was surrounded by a partisans force nearly four thousand strong under the command of anarchist Yakov Triapitsyn, who was loosely allied with the Bolshevik Red Army.
Output (grade 11): In January 1920, the town had been surrounded by an army of four thousand controlled by Yakov Triapitsyn, who was allied with the Red Army.