Trotsky armed all available workers, men and women, ordering the transfer of military forces from Moscow. Within a few weeks the Red Army defending Petrograd had tripled in size and outnumbered Yudenich three to one. At this point Yudenich, short of supplies, decided to call off the siege of the city and withdrew, repeatedly asking permission to withdraw his army across the border to Estonia. However, units retreating across the border were disarmed and interned by order of the Estonian government, which had entered into peace negotiations with the Soviet Government on 16 September and had been informed by the Soviet authorities of their 6 November decision that, should the White Army be allowed to retreat into Estonia, it would be pursued across the border by the Reds. In fact, the Reds attacked Estonian army positions and fighting continued until a cease-fire went into effect on 3 January 1920. Following the Treaty of Tartu most of Yudenich's soldiers went into exile. Former Imperial Russian and then Finnish Gen. Mannerheim planned an intervention to help the Whites in Russia capture Petrograd. However, he did not gain the necessary support for the endeavour. Lenin considered it "completely certain, that the slightest aid from Finland would have determined the fate of city".