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A group of Red Guards hung a red lantern atop the tower of the Helsinki Workers' House, symbolically marking the start of the Finnish Civil War.

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Red Guards (Finland)
Paramilitary organization in early 20th-century Finland
The Red Guards were the paramilitary units of the labour movement in Finland during the early 1900s. The Red Guards formed the army of Red Finland and were one of the main belligerents of the Finnish Civil War in 1918.Source: Wikipedia (CC BY-SA)
Paasitorni
Historic building in Helsinki, Finland
Paasitorni, also known as the Helsinki Workers' House, is a conference and congress centre of exceptional value in terms of its architecture and cultural history. The historic building is located in Hakaniemi, Helsinki, Finland. It was designed in Art Nouveau style by architect…Source: Wikipedia (CC BY-SA)
Finnish Civil War
1918 civil war in Finland
The Finnish Civil War was a civil war in Finland in 1918 fought for the leadership and control of the country between White Finland and the Finnish Socialist Workers' Republic during the country's transition from a grand duchy ruled by the Russian Empire to a fully independent…Source: Wikipedia (CC BY-SA)