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The Russo–Swedish War of 1741–1743, known as the Hats' Russian War in Sweden and the Hats' War in Finland, which resulted in the Lesser Wrath (Finnish: Pikkuviha, Swedish: Lilla ofreden), or the occupation of Finland, was instigated by the Hats, a Swedish political party that aspired to regain the territories lost to Russia during the Great Northern War, and by French diplomacy, which sought to divert Russia's attention from supporting its long-standing ally, the Habsburg monarchy, in the War of the Austrian Succession.
While 8,000 Swedish and Finnish troops were being deployed at the Russian border, near Lappeenranta (Swedish: Villmanstrand) and Hamina (Swedish: Frederikshamn), Sweden declared war on August 8. The objective of these maneuvers was to threaten Saint Petersburg and to set the stage for a coup d'état, engineered by French and Swedish diplomats and aimed at toppling the pro-Austrian regime of Anna Leopoldovna. The coup did take place in December, but the new Tsarina, Elizaveta Petrovna, reneged on her promises to return the Baltic provinces to Sweden and continued the vigorous prosecution of the war, under the guidance of her pro-Austrian chancellor, Aleksey Bestuzhev.
The threat to the Russian capital had been relieved as early as September 3, when 20,000 Russians under Field-Marshal Peter Lacy advanced from Vyborg (Swedish: Viborg, Finnish: Viipuri) towards Lappeenranta (Swedish: Villmanstrand) and inflicted a major defeat on the Swedish commander Charles Emil Lewenhaupt. By June 1742, the 35,000-strong Russian army ousted 17,000 Swedes from Hamina (Swedish: Frederikshamn). As the war unfolded, Lewenhaupt's position deteriorated and he was forced to retreat towards Helsinki (Swedish: Helsingfors). In August, Lacy captured Porvoo (Swedish: Borgå) and Savonlinna (Swedish: Nyslott) and encircled the entire Swedish army near Helsinki, where he received Lewenhaupt's capitulation on September 4.
As soon as hostilities ceased and the Russian army entered Turku (Swedish: Åbo), the statesmen Alexander Rumyantsev and Ernst Nolken arrived at the city in order to discuss a peace settlement. The Tsarina promised to evacuate her army from Finland on the condition that Adolf Frederick of Holstein-Gottorp — that is, the uncle of her own heir apparent — was named as the heir to the throne of Sweden. (The latter had been offered the crown of Finland by the local lantdag). The Hats acquiesced in her proposal in the hope that Adolf Frederick would be able to obtain better terms from her. Elizabeth also wanted Russian forces to occupy Sweden in order to ensure Adolf Frederick's peaceful election, but this plan aroused the vehement opposition of the Swedish representatives and was abandoned.
While peace negotiations lumbered on, the Baltic Fleet of Russia destroyed a Swedish flotilla near Korpo Island (Finnish: Korppoo). The following month, Lacy — who had distinguished himself in similar operations during the Great Northern War — embarked from Kronstadt in order to effect a landing in Sweden proper. When the Baltic Fleet was approaching Umeå, news came that the Treaty of Åbo (Finnish: Turku) had been finalized, with Sweden ceding to Russia the towns of Lappeenranta and Hamina and a strip of Finland to the northwest of Saint Petersburg. The Kymi River was to form part of the border between the two powers. The treaty marked the further decline of Sweden as a great power in Northern Europe.
The territory ceded to Russia was added to the Russian gains in the Treaty of Nystad (Finnish: Uusikaupunki) in 1721, under the Governorate of Vyborg. This was later incorporated into the Russian Grand Duchy of Finland in 1812.