When his forces withdrew in 1920, Kolchak faced numerous mutinies that joined the guerrillas, leaving his loyal few completely alone and condemned. The Eastern Front of the Red Army, under the command of Major General Vladimir Olderogge and formed by 70,000 soldiers, seized Tyumen and Kurgan and then attacked Petropavlovsk on August 25. In response, 58,000 targets commanded by General Mikhail Diterikhs fought back, seizing Tobolsk and driving the Bolsheviks across the Tobol River. On October 14 with 75,000 soldiers, Olderogge ordered a new offensive, forcing the 56,000 whites to withdraw from Petropavlovsk on October 29. Diterikhs suffered 5,000 dead and 8,000 prisoners. After the defeat, the Bolshevik advance became unstoppable, as did the peasant guerrillas. Nearly 100,000 whites were killed, captured or deserted in the following months. Omsk, Novosibirsk, Tomsk, Krasnoyarsk and Irkutsk all fell into their hands. In early February 1920, after the Great Siberian Ice March 25,000 surviving white soldiers entered Irkutsk and soon fled to Chita. The withdrawal of the Japanese from Chitá, on October 21, 1920, and the consolidation of the Republic of the Far East made the guerrillas disappear from the region.