The Finnish War was fought between the Kingdom of Sweden and the Russian Empire from 21 February 1808 to 17 September 1809. As a result of the war, the eastern third of Sweden was established as the autonomous Grand Duchy of Finland within the Russian Empire. Other notable effects were the Swedish parliament's adoption of a new constitution and the establishment of the House of Bernadotte, the new Swedish royal house, in 1818.
Joachim Zachris Duncker was a Swedish soldier born in Ristiina in Savonia.
The Battle of Sävar was fought on Saturday, 19 August 1809, between Swedish and Russian forces, during the Finnish War; it was the last pitched battle to be fought in Sweden. After the Russian conquest of eastern Sweden in 1808, the Swedish forces retreated to actual Sweden. In March the following year, Russian emperor Alexander I launched a threefold attack on Sweden, to force the country into the Continental System and to cede Finland to the Russian Empire; despite early advantages at Kalix and the Åland Islands, the attack failed to achieve a quick ending to the war. After further campaigning in northern Sweden, with battles such as Skellefteå and Hörnefors, the Russian forces under Nikolay Kamensky occupied all of Västerbotten by June.
The Battle of Revolax took place on 27 April 1808 at Revonlahti, in Northern Ostrobothnia, Finland, when the Swedish supreme commander Wilhelm Mauritz Klingspor and the Savolax brigade under Colonel Johan Adam Cronstedt, a total of about 2,250 Swedes surprised an isolated Russian column of about 1,700 men under Major General Michail Leontievich Bulatov. The Russians were surrounded and tried to cut their way through but failed and the Russian general Bulatov was taken prisoner by the Swedes.
The Battle of Pulkkila was fought between Swedish and Russian forces near Pulkkila in Northern Ostrobothnia on 2 May 1808 during the Finnish War.
The Battle of Oravais was one of the decisive battles in the Finnish War, fought from 1808 to 1809 between Sweden and the Russian Empire as part of the wider Napoleonic Wars. Taking place in modern-day Vörå in western Finland, it is sometimes regarded as the turning point of the Finnish War: the last chance for Sweden to turn the war to her advantage. It was the bloodiest battle of the conflict, along with the Battle of Sävar, which some historians attribute to the exhaustion, resignation and desperation of the Swedish army: it was losing the war, and defeat led to its loss of Finland to Russia.
The Battle of Koljonvirta i.e. the Battle of the Virta Bridge was fought between Swedish and Russian troops on October 27, 1808. The Swedish force consisted of troops from Savolax and Östergötland. After the main Swedish army had been defeated at the Battle of Oravais the army under Johan August Sandels in Savonia had to retreat in order not to be outflanked by the Russians. Sandels found a good defensive position north of Iisalmi and decided to resist the Russian advance there.
The Battle of Pyhäjoki was a retreating action fought on 16 April 1808, at Pyhäjoki in Northern Ostrobothnia during the Russian–Swedish war of 1808–09. The winter made the operations more difficult and the battle of Pyhäjoki became one of the first skirmishes to be fought after the Swedish retreat stopped. The Russian army had been following the Swedish army to the north. At the same time, they had left large portions of Finland to be occupied by the Russians. Yakov Petrovich Kulnev led a vanguard of 1,300 men — his army counted 4,000 men in total — and caught up with the rearguard of the retreating Swedish main army at the village of Ypperi. Skirmishes occurred all the way to Pyhäjoki, where the Swedes made a brief stand, before Wilhelm Mauritz Klingspor gave orders to von Döbeln and Gripenberg to continue the retreat to follow the original strategic plan. The Swedes had checked Kulnev's attack with about 2,000–2,500 men, however, as the Swedes fought a retreating battle, only one battalion at the time could go up against the Russians for most of the fighting. They had lost 183 men in killed, wounded and captured. Kulnev had lost 71 men at Pyhäjoki alone but probably around double that number when applying the losses from the fighting at Ypperi towards Pyhäjoki.
The Battle of Nykarleby was fought between Sweden and the Russian Empire during the Finnish War of 1808–1809.
The Battle of Vaasa was fought between the Kingdom of Sweden and the Russian Empire during the Finnish War (1808-1809).
The Helsinki village landing was fought during the Finnish War between Sweden and Russia on 26–28 September 1808, a part of the battles of the Turku archipelago. King Gustav IV Adolf of Sweden planned a large landing operation, over 8,000 strong. Due to the difficult sea weather conditions, the task force under Colonel Anders Fredrik Skjöldebrad was forced to return to Sweden, damaged and broken. The other task force of 3,300 men under Lieutenant Colonel Gustav Olof Lagerbring landed at Helsinki village (Taivassalo) successfully and the troops advanced to the inland areas. The king of Sweden was late to the battle area himself; he arrived on 28 September 1808 in his own yacht.
The battles of Ruona and Salmi was fought between Swedish and Russian troops on 1–2 September 1808 at Ruona and Salmi, Kuortane. The Swedish army was led by Carl Johan Adlercreutz with 4,700–5,000 men under his command against the Russian army of 7,000–7,700 men under the command of Nikolay Kamensky. The battle turned up to be a major engagement in the war where fierce artillery fire occurred from both sides. The Swedes, who were in a well-fortified position, retreated after a while with a loss of 170 killed, 400 wounded and 110 captured according to Adlercreutz, in addition several hundred men had fallen ill. The Russians lost 128 killed, 648 wounded and 51 captured according to their own estimates. This battle is considered one of the turning points in the Finnish War along with the battle of Oravais.
The Battle of Lintulaks was fought between Swedish and Russian forces at Lintulaks in Finland on 3 July 1808 during the Finnish War.
The Battle of Kokonsaari was fought between Swedish and Russian forces at Kokonsaari in Finland on 11 July 1808 during the Finnish War.
The Battle of Lappfjärd was fought between Swedish and Russian forces at Lappfjärd in Finland on 29 August 1808 during the Finnish War.
The Battle of Pälkjärvi was fought between Swedish and Russian forces at Pälkjärvi (Pyalkyarvi) in present-day Russia on 10 August 1808 during the Finnish War.
The Battle of Lokalaks was fought between Swedish and Russian forces at Lokalaks, Finland on 17–18 September 1808 during the Finnish War.
The Åland Offensive, during the Finnish War, was part of a threefold attack on Sweden, by the Russian Empire, to enforce peace; with Sweden entering the Continental System while also surrendering Finland. Åland was to be used for an immediate attack on Stockholm. As the offensive commenced, on 10 March 1809, only minor skirmishes occurred as the Swedish forces, under Georg Carl von Döbeln, quickly withdrew over the ice, towards Stockholm; this left Gotthard Johann von Knorring and his Russian army in full control over the islands. Although suffering heavy casualties, the Swedish army escaped destruction, which resulted in the Convention of Åland; which saw the end to the Russian offensive, and their subsequent withdrawal from the islands.
The Battle of Skellefteå took place during the Finnish War, on 15 May 1809, when 6,000 Russians under Pavel Andreyevich Shuvalov attacked 700 Swedes under Johan Henrik Furumark, at Skellefteå, Sweden. The Swedes, who fought a delaying action to buy time for their provisions to be escorted to safety, were captured as the Russians flanked around and cut-off their way of retreat. Most provisions, however, were saved.
The Battle of Hörnefors took place during the Finnish War, on 5 July 1809, when 2,400 Swedes under Johan August Sandels went on a counter-offensive against 3,350 Russians under Ilya Alekseyev and Pavel Andreyevich Shuvalov, at Hörnefors, Sweden. After more than two hours of intense fighting along the Hörnån (river) Sandels ordered a retreat, after having been misinformed of a greater Russian flanking attack.
Sweden 
Russian Empire