This is where the pre- and post-1900 discussion boundary can be a nuisance (though it's generally a good organizing tool): in 1917, when the Bolshevik Revolution began, it divided Finland between nationalist Whites and communist Reds, with the Reds seizing the south (and thus most of the cities) by early 1918, and the Whites appealing to Sweden and Germany for help. The Swedes declined (though some right-wing officers volunteered individually), while the Germans sent a division that helped the Finnish Whites win quickly and decisively.
The commander of the German expeditionary force, Rüdiger von der Goltz (whose son would later be Dietrich Bonhoeffer's defense attorney), speculated that Sweden could have reestablished its historical links to Finland if it, not Germany, had helped drive out the Reds.
It was only in the 1890s that Russia dissolved the Finnish local defense units that had been tolerated after 1809, which in 1917 cost the Whites time for developing a nationalist army to oppose the local soviets. There, a bit of relevant pre-1900 info.
The commander of the German expeditionary force, Rüdiger von der Goltz (whose son would later be Dietrich Bonhoeffer's defense attorney), speculated that Sweden could have reestablished its historical links to Finland if it, not Germany, had helped drive out the Reds.
It was only in the 1890s that Russia dissolved the Finnish local defense units that had been tolerated after 1809, which in 1917 cost the Whites time for developing a nationalist army to oppose the local soviets. There, a bit of relevant pre-1900 info.