Forest Guerrillas was a Finnic

Finnic peoples

The Finnic or Fennic peoples were historic ethnic groups who spoke various languages traditionally classified as Finno-Permic...

 resistance movement

Resistance movement

A resistance movement is a group or collection of individual groups, dedicated to opposing an invader in an occupied country or the government of a sovereign state. It may seek to achieve its objects through either the use of nonviolent resistance or the use of armed force...

 formed by some of the inhabitants of the parishes of Repola

Repola

Repola is a parish in the Republic of Karelia of the Russian Federation by the Finnish border. In 1926 the parish had a population of 1465.After Finland's declaration of independence the parish became an issue in Finnish-Russian relations when its population held a vote in August 1918 to join...

 and Porajärvi in addition to several White Guard

White Guard (Finland)

The White Guard was a voluntary militia that emerged victorious over the socialist Red Guard as part of the Whites in the Finnish Civil War of 1918...

 volunteers after their territory was ceded to Bolshevist Russia

Russian Soviet Federative Socialist Republic

The Russian Soviet Federative Socialist Republic , commonly referred to as Soviet Russia, Bolshevik Russia, or simply Russia, was the largest, most populous and economically developed republic in the former Soviet Union....

 in the Treaty of Tartu

Treaty of Tartu (Russian–Finnish)

The Treaty of Tartu between Finland and Soviet Russia was signed on 14 October 1920 after negotiations that lasted for four months. The treaty confirmed the border between Finland and Soviet Russia after the Finnish civil war and Finnish volunteer expeditions in Russian East Karelia. Ratifications...

 of 1920. The conflict is known as the East Karelian Uprising. The 2,000 metsäsissi forces managed to capture large parts of East Karelia

East Karelia

East Karelia , also rendered as Eastern Karelia or Russian Karelia, is a name for the part of Karelia that since the Treaty of Stolbova in 1617 has remained Christian Orthodox under Russian supremacy. It is separated from the western part of Karelia, called Finnish Karelia or historically Swedish...

 during their rebellion against their Russian rulers in 1921, aiming to unite these areas with the newly formed Republic of Finland

Finland

Finland , officially the Republic of Finland, is a Nordic country situated in the Fennoscandian region of Northern Europe. It is bordered by Sweden in the west, Norway in the north and Russia in the east, while Estonia lies to its south across the Gulf of Finland.Around 5.4 million people reside...

. Ultimately, however, in 1922 the last rebel forces were driven back into Finland by the Bolshevik

Bolshevik

The Bolsheviks, originally also Bolshevists , derived from bol'shinstvo, "majority") were a faction of the Marxist Russian Social Democratic Labour Party which split apart from the Menshevik faction at the Second Party Congress in 1903....

army.