Complete the following sentence: Fighting spread with the Red Guards beginning the seizure of Helsinki on the night of January 27/28. White forces led by General Mannerheim controlled the northernmost five-sixths of Finland, while the Reds controlled the southernmost region, containing approximately half of the country's population and including the cities of Pori, Turku, Tampere, Riihimäki, Helsinki, Kotka, and Viipuri.<unk> White forces led by General Mannerheim controlled the northernmost five-sixths of Finland, while the Reds controlled the southernmost region, containing approximately half of the country's population and including the cities of Pori, Turku, Tampere, Riihimäki, Helsinki, Kotka, and Viipuri. <unk> <unk> <unk>
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