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BATTLE // December 7, 1939

Battle of Suomussalmi

Cartographic map of the Battle of Suomussalmi
Виктор В, via Wikimedia Commons · Public domain

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Overview

The Battle of Suomussalmi was fought between Finnish and Soviet forces in the Winter War. The action took place from 30 November 1939 to 8 January 1940. The outcome was a Finnish victory against superior forces. The battle is considered the war's clearest, most important, and most significant Finnish victory in the northern half of Finland.

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

Significance

The Battle of Suomussalmi, fought from 30 November 1939 to 8 January 1940, is considered the clearest and most significant Finnish victory in the northern half of Finland during the Winter War. A Finnish force of approximately 17,000 men defeated a Soviet force of roughly 48,000, inflicting nearly 13,000 casualties while sustaining around 2,700 of their own. The result demonstrated that Finnish forces could defeat numerically superior Soviet formations, and the engagement stands as the defining Finnish operational success of the northern theater in the Winter War.

Forces & casualties

Troop strength

  • Finland17,000
    medium
  • Soviet Union48,000
    medium

Soviet Union fielded a 2.8 : 1 numerical advantage

Casualties

  • Finland2,700
    medium16% loss rate
  • Soviet Union12,972
    medium27% loss rate

Commanders (9)

Finland

Soviet Union

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6 sibling battles · 2 factions

Last verified May 2026
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