|Battle of Suomenlinna|
|Part of the Crimean War|
Grand Duchy of Finland
|Commanders and leaders|
|15000 Soldiers, 1500 Cannons||77 ships|
|Casualties and losses|
|260 dead and wounded|
Constructed during the Swedish rule of Finland in the 18th century the fortress of Viapori (sv:Sveaborg, renamed in Finnish in 1918 as fi:Suomenlinna) was the main defensive installation in the Grand Duchy of Finland. After the capital of the Grand Duchy of Finland had been moved from Turku to Helsinki in 1827 the value of Viapori only increased. However by the Crimean War the artillery of the fortress had already become obsolete. After the engagements of 1854 Russians (and Finns) expected attack against Viapori in 1855. The Small skirmishes had been fought along the coast between Russian and British/French forces in the early summer of 1855 only worsened the fear while bulk of the Russian fleet had become isolated and surrounded to the port and fortress of Kronstadt off the Saint Petersburg.
British and French naval forces consisting of 77 ships arrayed for the long expected battle on 6 August 1855. They formed into a battle line more than 3 km off shore beyond the range of the defender's obsolete artillery. Three days later the bombardment commenced. It continued for 47–48 hours all the while the attacker sat beyond the range of the defender. The British and French bombarded only the fortress of Viapori and avoided firing at the town of Helsinki directly. While the bombardment caused damage to the structures above ground, including to several gunpowder magazines which exploded, the bulk of the defending forces survived unscathed with their weaponry intact leading to a stalemate with the attackers guns being unable to defeat the defender and defenders guns being unable to reach the attacker. Once the guns had become silenced the ships remained in the same offshore position leading to growing fears of a landing. However British and French forces landed troops neither at Viapori nor Helsinki.
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