The Finnish Civil War was a civil war in 1918 fought for the leadership and control of recently independent Finland (formerly part of Russia) between White Finland and the Finnish Socialist Workers' Republic (Red Finland). The clashes took place in the context of the national, political, and social turmoil caused by World War I (Eastern Front) in Europe. The belligerents were the paramilitary Red Guards, led by a section of the Social Democratic Party with backup of the Russian bolsheviks, and the paramilitary White Guards of the senate. General C. G. E. Mannerheim led the White Guards with major assistance by both the Finnish Jäger Battalion trained in Germany and the German Imperial Army, along the German goal to control Fennoscandia and Petrograd of Russia. The Reds, composed of industrial and agrarian working class people, controlled the cities and industrial centres of southern Finland. The Whites, composed of land owners and the middle and upper class, controlled the rural central and northern Finland.
In the years before the conflict, Finland had experienced rapid population growth, industrialisation, gradually increasing urbanisation and the rise of a comprehensive labour movement. The country's political and governmental systems were in an unstable phase of democratisation and modernisation. The socio-economic condition and education of the population had gradually improved, and national awareness and culture had progressed. World War I led to the collapse of the Russian Empire, causing a power vacuum in Finland, and the subsequent struggle for dominance led to militarisation and an escalating crisis between the left-leaning labour movement and the conservatives.
The Reds carried out an unsuccessful general offensive in February 1918, supplied with weapons by Soviet Russia. A counteroffensive by the Whites began in March, reinforced by the German Empire's military detachments in April. The decisive engagements were the Battles of Tampere and Viipuri, won by the Whites, and the Battles of Helsinki and Lahti, won by German troops, leading to overall victory for the Whites and the German forces. Political violence became a part of this warfare with around 12,000 casualties - most of them were Reds. Moreover, about 12,500 Red prisoners died of malnutrition and disease in camps. In total around 38,000 people died in the conflict, where around one million Finns of the total population of three million had been more or less involved with.
In the immediate aftermath, Finland passed from the sphere of influence of Soviet Russia to the German power sphere with a plan to establish a German-led Finnish monarchy. The scheme ended with Germany's defeat in World War I, and Finland instead emerged as a sovereign, democratic, constitutional state with proper civil society. The civil war divided the nation for decades. The Finnish society was gradually reunited through social compromises based on a long-term culture of moderate politics, religion and a post-war economic recovery.
The war has been assigned several designations according to different political and ideological viewpoints. War of Independence (Finnish: vapaussota) was used during the war by both sides to express the fight for liberation from capitalism for the Reds and freedom from Soviet Russian influence by the Whites; Civil War is the term increasingly employed by the reconstituted social democrats after their defeat in the war. The general terms for the conflict, Civil War (Finnish: sisällissota) and Citizen War (Finnish: kansalaissota), are synonymous and appeared mostly after the war. More ideologic names were also used including Class War (Finnish: luokkasota) and Revolution (Finnish: vallankumous) by the Reds and their supporters while Red Rebellion (Finnish: punakapina) was used by the Whites and their supporters. Another designation, Brethren War (Finnish: veljessota), is applied in some poetic settings. According to a 2008 interview of 1,005 people done by the newspaper Aamulehti, the most popular names were as follows: Civil War: 29%, Citizen War: 25%, Class War: 13%, War of Independence: 11%, Red Rebellion: 5%, Revolution: 1%, other name: 2% and no answer: 14%.
Finland as grand duchy: 1809–1917
From 1809 to 1898, a period called the Pax Russica, the peripheral authority of the Finns gradually increased, and relations between the Russian Empire and the Grand Duchy of Finland were largely peaceful. Russia's defeat in the Crimean War in the 1850s led to attempts to speed up the modernisation of the country. This caused more than 50 years of economic, industrial, cultural and educational progress in the Grand Duchy of Finland, including an improvement in the status of the Finnish language. These developments encouraged Finnish nationalism and cultural unity through the birth of the Fennoman movement, which bound the Finns to the domestic administration and led to the idea that the Grand Duchy was an increasingly autonomous state ruled by the Russian Empire.
In contrast, in 1899, the Russian Empire had begun to initiate a policy of integration through the Russification of Finland.
The strengthened, pan-slavist central power tried to unite the "Russian Multinational Dynastic Union" as the military and strategic situation of Russia became more perilous due to the rise of Germany and Japan. Finns called the increased military and administrative control, the "First Period of Oppression", and for the first time Finnish politicians drew up plans for disengagement from Russia or full sovereignty for Finland. In the struggle against integration, activists drawn from sections of the working class and the Swedish-speaking intelligentsia carried out terrorist acts. During World War I and the rise of Germanism, the pro-Swedish Svecomans began their covert collaboration with Imperial Germany and, from 1915 to 1917, a Jäger (Finnish: jääkäri; Swedish: jägare) battalion consisting of 1,900 Finnish volunteers was trained in Germany.
The major reasons for rising political tensions among Finns were the autocratic rule of the Russian tsar and the undemocratic class system of the estates of the realm. The latter system originated in the regime of the Swedish Empire that preceded Russian governance and divided the Finnish people economically, socially and politically. Finland's population grew rapidly in the nineteenth century (from 860,000 in 1810 to 3,130,000 in 1917), and a class of agrarian and industrial workers, as well as crofters, emerged over the period. The Industrial Revolution was rapid in Finland, though it started later than in the rest of Western Europe. Industrialisation was financed by the state and some of the social problems associated with the industrial process were diminished by the administration's actions. Among urban workers, socio-economic problems steepened during periods of industrial depression. The position of rural workers worsened after the end of the nineteenth century, as farming became more efficient and market-oriented, and the development of industry was insufficiently vigorous to fully utilise the rapid population growth of the countryside.
The difference between Scandinavian-Finnish and Russian-Slavic culture affected the nature of Finnish national integration. The upper social strata took the lead and gained domestic authority from the Russian tsar in 1809. The estates planned to build an increasingly autonomous Finnish state, led by the elite and the intelligentsia. The Fennoman movement aimed to include the common people in a non-political role; the labour movement, youth associations and the temperance movement were initially led "from above".
Between 1870 and 1916 industrialisation gradually improved social conditions and the self-confidence of workers, but while the standard of living of the common people rose in absolute terms, the rift between rich and poor deepened markedly. The commoners' rising awareness of socio-economic and political questions interacted with the ideas of socialism, social liberalism and nationalism. The workers' initiatives and the corresponding responses of the dominant authorities intensified social conflict in Finland.