1905 Russian Revolution
Russian artillerymen and military engineers rose in revolt in the fortress of Sveaborg
Helsinki, Finland, Russian Empire (Now Finland)
On 12 August [O.S. 30 July] 1906, Russian artillerymen and military engineers rose in revolt in the fortress of Sveaborg (later called Suomenlinna), Helsinki. The Finnish Red Guards supported the Sveaborg Rebellion with a general strike, but the mutiny was quelled within 60 hours by loyal troops and ships of the Baltic Fleet.