War Memorial for a Swede - Finnish Civil War

Today I had a short history lesson...
This somewhat strange gravestone is found in the old burial ground above the cathedral in Härnösand. It is strange because it is a monument to a Swede who fell fighting in the Finnish civil war in 1918.
The writing on the stone reads...
Johan Edvard Dahlin
1884 - 1918
Fell fighting for Finland's
Freedom
in the battle of Tammerfors
Honour him, honour
the war in which he fell!
Friends in Finland raised this monument.

I had only the vaguest of ideas about that Finnish civil war and no idea what a Swede would be doing there. On to Wikipedia, both the English and Swedish versions. This is what I found...
Until 1917/18 Finland had been a province of Russia. After the Russian Revolution Finland seized its chance and declared independence.  Virtually everyone in Finland  was in favour of independence but there were two factions, each of which produced its own declaration of independence.
The Reds, supported by the Russian revolutionary forces favoured a similar process in Finland, led by the industrial workers. The more conservative groups in society formed the Whites. To add to the mix, WW1 was still going on and the Germans supported the Whites, which meant the British leaned towards the Reds.  The Swedes were neutral but the conservative Swedish government hoped the whites would win because a Red Finland would have increased the likelihood of a Red Sweden! Therefore the Swedes allowed both officers and men from the Swedish army to volunteer to fight on the side of the Whites. 
The Whites were the victors, mainly because they had the more professional army, including a Swedish Brigade of 1000 men who fought at Tammerfors. Presumably Johan Dahlin was one of the volunteers in that brigade.
I hope I'm not irritating any Scandinavian, especially Finnish, readers. If I've got anything wrong feel free to correct me in the comments!