October 14 1919, Orel–Denikin’s offensive towards Moscow reached its apex on October 14 by taking the city of Orel. Although still 240 miles from Moscow, the loss of the city caused a fair amount of panic among Red leadership, who quickly ordered the highest priority be given to the defense of the approaches to Moscow, especially Tula and its armories. Yudenich’s offensive against Petrograd also caused severe worries; Trotsky would write that Lenin thought the city was lost, though Kamenev disputes this. Regardless, reserves had to be divided between the defense of both Moscow and Petrograd.
Unfortunately for the Whites, however, their efforts on other fronts were not going as well as they were for Denikin and Yudenich. The Allies had pulled out of northern Russia entirely, their last forces leaving Murmansk on October 12. While the Whites remained in control there, they no longer posed any threat to Petrograd from the north, having long since pulled back from Lake Onega. The Finns adamantly refused to help Yudenich or the Whites in Northern Russia, and the Poles and Lithuanians were preoccupied with each other. In Siberia, Kolchak’s forces had long since lost all their gains from the spring, and an offensive toward the Tobol in September gained some ground but failed to make any dent in the Reds’ numerical superiority. Denikin’s capture of Orel and Yudenich’s march on Petrograd were to prove the high water mark of the White offensives in 1919.
Sources include: Evan Mawdsley, The Russian Civil War