The Finnish War of 1808-1809 was a catastrophe for Sweden. Russia, allied with Napoleon, invaded Finland in February 1808 and methodically stripped Sweden of a territory it had held for six hundred years. By summer 1809, Russian troops had crossed the Gulf of Bothnia and occupied Umeå, pushing deep into the Swedish heartland. Tsar Alexander I demanded the cession of all Finland, and his initial negotiating position was even more aggressive: he wanted the border drawn at the Kalix River, well inside what is today northern Sweden. The Swedish command, desperate for leverage before peace talks began, devised a bold plan. A seaborne task force of 6,800 soldiers would land north of the Russian positions at Umeå while a mainland army of 3,400 under Fabian Wrede attacked from the south, trapping the Russians between two forces.

Lieutenant-General Gustav Wachtmeister, a veteran of the Prussian army and the Pomeranian War, was chosen to lead the amphibious operation. His flotilla was formidable: two ships of the line, the Adolf Fredrik and the Forsiktigheten, one frigate, 44 gunboats and bomb vessels, six galleys, and up to 40 troop transports. The combined Swedish and British navies controlled the Baltic, so there was no Russian threat at sea. Wachtmeister's force departed Stockholm on 8 August and sailed north, swinging east of the island of Holmon to avoid detection by the Russian garrison in Umeå. They reached Ratan, a coastal village 45 kilometers north of Umeå, on 16 August. The soldiers disembarked the following day and immediately clashed with a small Russian detachment at Djäkneboda, destroying it.

The Russian commander, Lieutenant-General Nikolay Kamensky, learned of the Swedish landing while marching south. He reversed course with remarkable speed and struck Wachtmeister's advancing force at Sävar, 20 kilometers north of Umeå, on the morning of 19 August. The Russians seized the high ground immediately, and the Swedes found themselves counterattacking uphill. The fighting was ferocious. By 3:00 in the afternoon, Wachtmeister ordered a retreat to Ratan, having suffered 396 dead and some 450 wounded. Russian losses were heavier still: around 600 killed and 1,000 wounded. But Kamensky had won the field, and the Swedish plan to squeeze the Russians in a pincer had failed. What remained was the fallback: Ratan, where the fleet waited.

Wachtmeister's battered force dug in at Ratan overnight, and on 20 August, Kamensky attacked again. This time, however, the engagement was different. The Russians were not trying to destroy the Swedes so much as buy time for their supply wagons to escape northward. And this time, the Swedish fleet could bring its guns to bear. Roughly a hundred cannons, both shore-based and shipborne, hammered the Russian positions. The bombardment devastated the village and its surroundings. Under this umbrella of fire, Wachtmeister held his ground. Kamensky, unable to advance against such concentrated firepower and unwilling to absorb further casualties after the bloodletting at Sävar, withdrew north toward Piteå. Swedish casualties at Ratan were comparatively light: 26 dead and 2 captured, with total losses between 150 and 181. The Russians lost roughly 150 men. Shortly after, Swedish troops marched into Umeå unopposed.

The battles of Sävar and Ratan did not reverse the outcome of the war. Sweden still lost Finland, and the Treaty of Fredrikshamn in September 1809 formalized the separation of a territory that had been Swedish since the Middle Ages. But historians have argued that the fighting in August helped push the final border northward. Instead of the Kalix River line Alexander had originally demanded, the treaty drew the frontier along the Tornio and Muonio rivers, leaving Sweden a larger slice of the far north. That seemingly modest cartographic adjustment proved enormously consequential. The territories Sweden retained contained some of Europe's richest iron ore deposits, discoveries that would fuel the country's industrialization in the late nineteenth and twentieth centuries. The cannons fired at Ratan on that August morning in 1809, it turned out, were defending ground worth more than anyone alive that day could have imagined.