ABSTRACT
An unexpected threat to the Bolshevik regime was the attack on Petrograd in September 1919, led by a former Tsarist General, Yudenich. With 18,500 troops, and a few British tanks, he drove back the 25,000 Red Army troops to within sight of Petrograd. But he failed to cut the Moscow - Tosno-Petrograd railway; as a result, Trotsky was able to enter the city, organize its defence, and launch a counter attack which drove Yudenich back to Estonia. The Bolsheviks then signed their first independence Treaty with Estonia, largely to prevent any further such attacks
