The Sveaborg Rebellion was a rebellion which started June 30, 1906 on the sea fortress Sveaborg (renamed "Suomenlinna" in Finnish in 1918) as part of the Russian Revolution of 1905–1907. The rebellion began when Sveaborg's Russian soldiers started a mutiny against the bad treatment of soldiers and against officers. The rebellion was also a protest against the loss at the Russo-Japanese War. The rebels believed that by rebelling, they would get support from other rebellions, but they didn't and the rebellion ended in 60 hours.