Forest Guerrillas (Finnish: Metsäsissit) was a Finnic resistance movement formed by some of the inhabitants of the parishes of Repola and Porajärvi in addition to several White Guard volunteers after their territory was ceded to Bolshevist Russia in the Treaty of Tartu of 1920. The conflict is known as the East Karelian Uprising. The 2,000 metsäsissi forces managed to capture large parts of East Karelia during their rebellion against their Russian rulers in 1921, aiming to unite these areas with the newly formed Republic of Finland. Ultimately, however, in 1922 the last rebel forces were driven back into Finland by the Bolshevik army.