Key Facts
- Start date
- 10 April 1918
- End date
- 5 May 1918
- Duration
- Approximately 25 days
- Location
- Kymi river valley, Ahvenkoski, Finland
- Significance
- Last battle of the Finnish Civil War
Strategic Narrative Overview
After suffering a series of defeats, the Red Guards retreated to the Kymi river valley in southeastern Finland. By April 1918, Ahvenkoski and the surrounding region had become one of the last Red strongholds. Both sides dug into trenches along the Kymi river, engaging in prolonged fighting. German imperial forces, allied with the Finnish Whites, pressed the Red positions over several weeks, steadily reducing the remaining Red-held territory.
01 / The Origins
The Finnish Civil War broke out in January 1918 between the White Guards, backed by the German Empire, and the Red Guards of the Finnish Socialist Workers' Republic (Red Finland). The conflict arose from political and social tensions following Finland's declaration of independence in 1917, compounded by the Russian Revolution and the struggle between socialist and conservative factions over control of the new Finnish state.
03 / The Outcome
On 5 May 1918, the last of the Red Guards at Ahvenkoski surrendered, bringing the Finnish Civil War to a close. The victory confirmed the defeat of Red Finland and secured the White and German alliance's control over the country. The war's end was followed by mass imprisonments and executions of Red prisoners, leaving deep social and political scars in Finnish society.
Belligerents & Mobilization Analysis
Side A
2 belligerents
Side B
1 belligerent
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.