Northern European Intervention (Allied Defeat)

The Northern European Intervention was the intervention into the Second Russian Civil War by the Coalition nations in Northern Europe, including Finland, Sweden and Denmark, and the Baltic States between January and February 1939 after the Saint Petersburg Coup. The conflict ended in Decisive Fascist victory.

Finnish borders with Russia
After the Second Coalition War Against the Soviet Union, Finland gained lands in the south of Karelia, the Finnish could reach Saint Petersburg immediately after crossing the south Russo-Finnish borders.

Saint Petersburg Coup
The Saint Petersburg Coup was staged on January 10, 1939 and marked the beginning of the civil war. The Coalition immediately responded with interventions in the battles. Members of the Northern European Intervention planned to invade Saint Petersburg and have the Russian Fascists encircled in West Russian territories, destroying the entire Russian Fascist Army.

The Northern European Intervention begins
On January 12, the Northern European Intervention began, Coalition troops crossed the borders and attacked the Russian Fascist Army Headquarters in Saint Petersburg directly. The RFA halted the Southern Front immediately after the series of attacks and sent troops back to Saint Petersburg and the Murmansk Oblast. The Finnish forces led poor offensives throughout the intervention as they had poor knowledge about the terrain.

Fascist counterattack
In mid-January, the Russian Fascist Army held Saint Petersburg and launched a counteroffensive against Finland, recapturing the Murmansk Oblast and marched into the province of Karelia in Finland. In early February, the Coalition forces excluding Finnish forces were withdrawal. The Finnish forces launched attacks continuously despite their allies stopped intervening in Northwest Russia.

Withdrawal of Finnish forces and Fascist control of Karelia
In April, all the recent Finnish attacks were either halted or ended up as failures, Finland agreed to stop the intervention and the Treaty of Helsinki was signed, Fascist Russians gained control over the province of Karelia, it was later completely annexed at the end of the civil war.

Aftermath

 * Loss of Finnish lands
 * Finland withdrawal from the Coalition.