After the invasion of Poland, Heinrich Himmler sought to expand the ranks of the Waffen SS with foreign military volunteers. In January 1941, the 5th Panzer SS Division Wiking was officially named, made up of Norwegian, Swedish, Danish, Dutch, Estonian and Flemish soldiers. Under the command of Felix Steiner, SS Division Wiking took part in Army Group South's invasion of the Ukraine during Operation Barbarossa.
In June 1941, the Finnish Volunteer Battalion would be created, becoming the division's third battalion. The SS Wiking Division would play a integral part in the seizure of the Caucasus oilfields in 1942, allowing the rest of the German Army to sweep down into the Middle East and meet up with the Afrika Korps.
Their primary motivation for joining was to take part in the Reich's 'crusade against Bolshevism'. However, when the war ended, the Germans would turn on their volunteers. For the Danes and Dutch, their countries were to be annexed into the Reich. For the Swedes, their government was eventually forced to concede large swathes of it's iron ore deposits to the Reich, with a 'peacekeeping force' kept in the country to make sure the shipments went unmolested. For the Flemish soldiers, who had previously joined the fascist Rexist Party, Flanders would be annexed into the Reich and it's Dutch-inspired culture gradually suppressed in favour of National Socialism. The Finns were able to hold out the longest. Carl Gustaf von Mannerheim was able to ward off German occupation of his country until the 27th of January 1951, when he died. After his passing, Finland was treated like any other tributary state and German forces invaded to maintain the corridor of ore from Sweden.
But Estonia got it the worst. As part of Generalplan Ost, Estonia was brutally depopulated and it's Slavic population either starved to death as part of Nazi hunger polciies or were pushed further east to make way for German settlers.
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Finnish members of the SS Wiking Division
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Norwegian members somewhere in Russia
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Leon Degrelle, former leader of the Rexist Party in Belgium and SS-Standartenfuhrer
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Danish volunteers parading in Berlin, 1941.