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BATTLE // October 27, 1808

Battle of Koljonvirta

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Overview

The Battle of Koljonvirta i.e. the Battle of the Virta Bridge, also known as the battle of Idensalmi, was fought between Swedish and Russian troops on October 27, 1808, in the course of Finnish War, with the Swedes prevailed in the engagement despite Russian numerical advantage.

Overview adapted from Wikipedia, licensed under CC BY-SA 4.0.

Significance

At Koljonvirta, a Swedish force of roughly 1,200–1,800 troops under Johan August Sandels repulsed a Russian force estimated at 5,000–6,000, inflicting over 1,100 casualties on the attackers. The engagement demonstrated that Swedish and Finnish resistance could exact a heavy tactical price on Russian forces despite severe numerical disadvantage during the Finnish War of 1808–1809. The Swedish success at the Virta Bridge represented one of the more consequential defensive stands of the campaign, checking Russian momentum at a moment when the broader war was trending against Sweden.

Forces & casualties

Troop strength

  • Sweden1,200–1,800
    medium
  • Russian Empire5,000–6,000
    medium

Russian Empire fielded a 3.7 : 1 numerical advantage

Casualties

  • Russian Empire1,106
    medium20% loss rate

Commanders (3)

Russian Empire

Sweden

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6 sibling battles · 1 factions

Last verified June 2026
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