Suomenlinna (Finnish: [ˈsuo̯menˌlinːɑ]; until 1918 Viapori, Finnish: [ˈviaˌpori]), or Sveaborg (Swedish: [ˈsvɛːɑˈborj]), is an inhabited sea fortress composed of eight islands, of which six have been fortified; it is about 4 km southeast of the city center of Helsinki, the capital of Finland. Suomenlinna is popular with tourists and locals, who enjoy it as a picturesque picnic site. Originally named Sveaborg (Castle of the Swedes), or Viapori as referred to by Finnish-speaking Finns, it was renamed in Finnish to Suomenlinna (Castle of Finland) in 1918 for patriotic and nationalistic reasons, though it is sti...Read more

Suomenlinna (Finnish: [ˈsuo̯menˌlinːɑ]; until 1918 Viapori, Finnish: [ˈviaˌpori]), or Sveaborg (Swedish: [ˈsvɛːɑˈborj]), is an inhabited sea fortress composed of eight islands, of which six have been fortified; it is about 4 km southeast of the city center of Helsinki, the capital of Finland. Suomenlinna is popular with tourists and locals, who enjoy it as a picturesque picnic site. Originally named Sveaborg (Castle of the Swedes), or Viapori as referred to by Finnish-speaking Finns, it was renamed in Finnish to Suomenlinna (Castle of Finland) in 1918 for patriotic and nationalistic reasons, though it is still known by its original name in Sweden and by Swedish-speaking Finns. Due to its strategic geographical location, it sometimes used to be known as Gibraltar of the North.

The Swedish crown commenced the construction of the fortress in 1748 as protection against Russian expansionism. The general responsibility for the fortification work was given to Augustin Ehrensvärd. The original plan of the bastion fortress was strongly influenced by the ideas of Vauban, the foremost military engineer of the time, and the principles of the star fort style of fortification, albeit adapted to a group of rocky islands. Famous for these bastion fortifications, Suomenlinna became a UNESCO World Heritage Site in 1991.

During the Finnish War, Sweden surrendered the fortress to Russia on 3 May 1808, paving the way for the occupation of Finland by Russian forces in 1809, and the eventual cession of Finland to Russia at the conclusion of the war. The islands were then used as a base for the Russian Baltic Fleet in World War I, with Russia beginning the construction of the Krepost Sveaborg in 1915. Russian forces left after Finnland's independence in 1917. Finland then managed Suomenlinna through the Defense Department until turning most of it over to civilian control in 1973.

The Swedish era  Map of Sveaborg in the 1790sBackground

Early on in the Great Northern War, Russia took advantage of Swedish weakness in Ingria (sv: Ingermanland) and captured the area near the Neva River as well as the Swedish forts, Nyen and Nöteborg, built to protect it. In 1703, Peter the Great founded his new capital, Saint Petersburg, in that easternmost corner of the Gulf of Finland. In the approach to it he built the fortified naval base of Kronstadt. Russia soon became a maritime power and a force to be reckoned with in the Baltic Sea. The situation posed a threat to Sweden, which until that time had been the dominant power in the Baltic. This was visibly demonstrated by the use of naval forces in the Russian capture of Viborg in 1710. The main Swedish naval base at Karlskrona was too far to the south to meet Sweden's new needs for its navy in the 18th century, which often resulted in Swedish ships reaching the coast of Finland only after Russian ships and troops had either started or completed their spring campaigns.[1]

The lack of coastal defenses was keenly felt with Russian landings in Helsingfors in the spring of 1713 and the Swedish failure to blockade the Hanko Peninsula in 1714. A Russian naval campaign against the Swedish coast towards the end of the Great Northern War further outlined the need to develop Finnish coastal defenses. Immediately after the war ended the first plans were set in motion in Sweden to construct an archipelago fleet and a base of operations for it in Finland. However, nothing with regard to Sveaborg took place until the end of Russo-Swedish War of 1741–1743. Fortifications were left unfinished at Hamina and Lappeenranta while Hämeenlinna was being built into a supply base. Lack of funds, unwillingness to devote funds for defending Finland, and the belief (arising just before the war) that Russia would be pushed away from the Baltic Sea were the main causes for the lack of progress.[2]

The following Russo-Swedish War of 1741–1743, which quickly turned from a Swedish attack into a Russian occupation of Finland, again underlined the importance of developing fortifications in Finland. Lack of base of operations for naval forces made it difficult for the Swedish navy to operate in the area.[3] Other European states were also concerned about developments regarding Russia, especially France, with whom Sweden had concluded a military alliance. After lengthy debate, the Swedish parliament decided in 1747 to both fortify the Russian frontier and establish a naval base at Helsingfors as a counter to Kronstadt. Augustin Ehrensvärd (1710–1772), a young lieutenant colonel, was given the responsibility of designing the fortresses and directing construction operations.

 Bastion Zander Augustin Ehrensvärd's grave at SuomenlinnaConstruction

Sweden started building the fortresses in January 1748. Ehrensvärd's plan contained two fortifications: a sea fortress at Svartholm near the small town of Lovisa,[4] and a larger sea fortress and naval base (Sveaborg) at Helsingfors. There were two main aspects to Ehrensvärd's design for Sveaborg: a series of independent fortifications across several linked islands and, at the very heart of the complex, a navy dockyard. In addition to the island fortress itself, seafacing fortifications on the mainland would ensure that an enemy could not acquire a beach-head from which to stage attacks on the sea fort. The plan was also to stock munitions for the whole Finnish contingent of the Swedish Army and Royal Swedish Navy there. Additional plans were made for fortifying the Hanko Peninsula, but these were postponed.

Construction started in early 1748 kept expanding, and by September there were around 2,500 men building the fortresses. Initially the soldiers were housed in the vaults of the fortifications, while the officers had specially built quarters integrated into the baroque cityscape composition of the overall plan. The most ambitious plan was left only half completed: a baroque square on Iso Mustasaari partly based on the model of Place Vendôme in Paris. As the construction work progressed, more residential buildings were built, many following the shape of the fortification lines. Ehrensvärd and some of the other officers were keen artists who made oil paintings presenting a view of life in the fortress during its construction, and giving the impression of a lively "fortress town" community.

 Kuninkaanportti, The King's Gate

Due to repeated Russian threats in 1749 and 1750, more effort was placed on the island fortifications at the expense of those on the mainland, so that a safe base of operations could be secured for the Swedish naval units along the Finnish coast. Using the military garrisoned in Finland as the workforce, construction continued with over 6,000 workers in 1750. Fortifications at Gustavssvärd were completed in 1751 and the main fortifications on Vargö were ready in 1754. The fortress was fully operational though unfinished. These accomplishments did not reduce the pace of construction and in 1755 there were 7,000 workers constructing the fortifications outside of Helsingfors which at the time had around 2,000 residents. The substantial fortification work on the islands south of the town brought it a new and unexpected importance. Swedish participation to the Seven Years' War halted the construction efforts in 1757, which also marked the end of the rapid construction phase of Sveaborg.[5]

This period in Swedish history was known as the Age of Liberty, during which the kingdom was under increased parliamentary control, divided into two political parties, the Hats and the Caps. Ehrensvärd had been supported by the Hats, so when the Caps rose to power in 1766 he was relieved of his post and replaced with ardent Caps supporter Christopher Falkengréen. However, after 1769 when the Hats regained power, Ehrensvärd was again placed in command of the Swedish archipelago fleet in Finland, officially the arméens flotta ("fleet of the army"), and returned to Sveaborg. But additional progress had not been made on the fortifications when Ehrensvärd died in 1772. Efforts to improve the fortress continued under Jacob Magnus Sprengtporten, but his tenure was cut short by disagreements with King Gustav III. Once again efforts slowed down as garrisons were reduced, and in 1776 Sveaborg's commander reported that he could not even man one-tenth of the artillery placed in the fort. Even at the start of the Russo-Swedish War in 1788 Sveaborg remained in an incomplete state.[6]

Facilities for constructing ships for the Swedish archipelago fleet were built at Sveaborg in the 1760s. In 1764 the first three archipelago frigates were launched from there.[7] In addition to the construction of the fortifications and ships, naval officer training was started by Ehrensvärd at his own expense at Sveaborg in 1770. It took until 1779 before a naval military school was formally founded there.[8]

Service  View from Länsi-Mustasaari to Pikku-Mustasaari A pojama flying the blue naval ensign of the Swedish archipelago fleet in Artilleriviken (Tykistölahti); painting by Adolf Geete, 1760

Sveaborg was formed and stocked according to the needs of the Swedish archipelago fleet and thus was unable to repair and refit the Swedish battlefleet after the battle of Hogland. Facilities were also found lacking at Sveaborg, especially in the areas intended for taking care of the sick and wounded. Russian control of the waters outside of Sveaborg practically blockaded the Swedish battlefleet to Sveaborg. By cutting the coastal sea route past Hangö, Russians prevented supplies from being shipped from Sweden to Sveaborg. The Swedish fleet finally managed to set sail for its base at Karlskrona on 20 November when the Baltic Sea had already frozen severely enough that ice had to be sawed open before some ships could move. The fleet could not overwinter at Sveaborg since it lacked the facilities and supplies for fitting the ships.[9]

While the route to Sweden was open again in late 1788 and in early 1789, Russian ships cut the connection from Sveaborg to Sweden by forming a blockade at Porkkala cape. Sveaborg was the most important location for archipelago fleet's ship construction and fitting during the war. Even so, and despite efforts, several ships remained unfinished at Sveaborg until the end of the war. The importance of Sveaborg did not escape the Russians whose broad operational plan for 1790 included a siege of Sveaborg both from sea and land.[10]

Following a pact between Alexander I and Napoleon, Russia launched a campaign against Sweden and occupied Finland in 1808. The Russians easily took Helsingfors in early 1808 and began bombarding the fortress.[11] Its commander, Carl Olof Cronstedt, negotiated a cease-fire. When no Swedish reinforcements had arrived by May, Sveaborg, with almost 7,000 men, surrendered. The reasons for Cronstedt's actions remain somewhat unclear; but the hopeless situation, psychological warfare by the Russians, some (possibly) bribed advisors, fear for the lives of a large civilian population, lack of gunpowder, and their physical isolation are some likely causes for the surrender. By the Treaty of Fredrikshamn in 1809, Finland was ceded by Sweden and became an autonomous grand duchy within the Russian Empire. The Swedish period in Finnish history, which had lasted some seven centuries, came to an end.

 Naval guns of SuomenlinnaUnder Russian rule

After taking over the fortress, the Russians started an extensive building program, mostly extra barracks, and extended the dockyard and reinforced the fortification lines. The long period of peace following the transfer of power was shattered by the Crimean War of 1853–56. The French–English–Ottoman alliance decided to engage Russia on two fronts and sent an Anglo-French fleet to the Baltic Sea. For two summers during the Åland War the fleet shelled the towns and fortifications along the Finnish coast. The bombardment of Sveaborg (also known then as Viapori) by the forces of Richard Saunders Dundas and Charles Pénaud on 9–10 August 1855 lasted 47 hours and the fortress was badly damaged, but they were unable to knock out the Russian guns. After the bombardment, the Anglo-French fleet sent no troops ashore and instead set sail for Kronstadt.

After the Crimean War extensive restoration work was begun at Sveaborg. A new ring of earthworks with artillery emplacements was built at the western and southern edges of the islands.

The next stage in the arming of Sveaborg and the Gulf of Finland came in the build-up to World War I. The fortress and its surrounding islands became part of "Peter the Great's naval fortification" designed to safeguard the capital, Saint Petersburg.

 M/S Mariella passing through the Kustaanmiekka strait after leaving Helsinki for StockholmFinnish ownership  Submarine Vesikko

Following the Russian Revolution in 1917, the fortress became a possession of an independent Finland. After the Finnish Civil War, a prison camp existed on the island.[12] The fortress was officially renamed Suomenlinna (castle of Finland) as part of the wave of nationalism.

No longer very practical as a military base, Suomenlinna was turned over to civilian administration in 1973. An independent government department, the Governing Body of Suomenlinna, was formed to administer the unique complex. At the time there was some debate over its Finnish name, with some suggesting that the old name Viapori be restored, but the newer name was retained. The presence of the military on the islands has been drastically scaled down in recent decades. The Suomenlinna garrison houses the Naval Academy (Finnish: Merisotakoulu) of the Finnish Navy on Pikku Mustasaari. Suomenlinna still flies the war flag, or the swallow-tailed state flag of Finland.

^ Mattila (1983), p. 13–17, 27–47. ^ Mattila (1983), p. 54–55, 57–59. ^ Mattila (1983), p. 74–75. ^ Mattila (1983), p. 80–85. ^ Mattila (1983), p. 89–91. ^ Mattila (1983), p. 105–116. ^ Mattila (1983), p. 104. ^ Mattila (1983), p. 122–125. ^ Mattila (1983), p. 138–155. ^ Mattila (1983), p. 155–193. ^ Carl Nordling, L. "Capturing 'The Gibraltar of the North': How Swedish Sveaborg was taken by the Russians in 1808." Journal of Slavic Military Studies 17.4 (2004): 715–725. ^ Finnish Civil War#Prison camps
Photographies by:
Michal Pise, Michal.Pise - CC BY 2.0
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