Continuation War
On the 13th of March 1940, the Moscow Peace Treaty ended a ten-week conflict that left Finland with significant territorial losses. The Soviet Union had demanded cession of land on the Karelian Isthmus and islands in the Gulf of Finland during negotiations in October 1939. When Finnish leaders refused these terms, the Red Army invaded on the 30th of November 1939. Field Marshal C. G. E. Mannerheim assumed command of the Finnish Defence Forces on that same day as the invasion began.
The treaty forced Finland to surrender 9% of its national territory and 13% of its economic capacity to the Soviet Union. Approximately 420,000 civilians were evacuated from the ceded areas to live elsewhere within Finland's remaining borders. The Hanko Naval Base was granted to the Soviets near Helsinki, where they deployed over 30,000 military personnel.
Public opinion shifted dramatically after the war. The League of Nations expelled the Soviet Union for its illegal attack, though actual foreign aid remained minimal except for support from Sweden. Military spending rose to nearly half of public expenditure as the government prioritized national defense. The divisive White Guard tradition of celebrating the 16th of May victory-day from the Civil War was discontinued to preserve national unity.
Adolf Hitler ordered planning for an assault on the Soviet Union on the 31st of July 1940. This decision reversed Germany's previous policy of rejecting Finnish requests to purchase arms. By August 1940, secret sales of weapons to Finland became permitted under a military agreement signed on the 12th of September.
Soviet Foreign Minister Vyacheslav Molotov visited Berlin on 12, the 13th of November 1940 to demand German withdrawal of troops from Finland. He reminded Hitler of the 1939 pact regarding spheres of influence. Hitler rejected Molotov's suggestion that the Finnish question should mirror events in Bessarabia and the Baltic states.
German Colonel General Franz Halder and Reich Marshal Hermann Göring met with Finnish Major General Paavo Talvela in Berlin during December 1940. They advised the Finnish government in diplomatic terms that war preparations were underway. Regular contact between Finnish and German military leaders began in February 1941 when outlines of the actual plan were revealed.
The inner circle of Finnish leadership led by President Risto Ryti and Field Marshal Mannerheim planned joint operations without formal agreements. They maintained ambiguous neutrality while coordinating mobilization schedules. The Germans invited Finnish officers to meetings in Salzburg and Berlin from 25 to the 28th of May before continuing discussions in Helsinki from 3 to the 6th of June.
Finnish forces launched Operation Kilpapurjehdus in the early hours of the 22nd of June 1941, deploying troops into the demilitarized Åland Islands. This deployment violated the 1921 Åland convention according to historian Mauno Jokipii. The operation coordinated with the German invasion and included arrest of Soviet consulate staff stationed on the islands.
On the 25th of June, the Soviet Union launched an air offensive with 460 fighters and bombers targeting 19 Finnish airfields. Inaccurate intelligence caused several raids to hit civilian cities instead of military targets. Twenty-three Soviet bombers were lost during this strike while Finnish forces suffered no aircraft losses. The Finnish Parliament used these attacks as justification for approving a defensive war.
The VI Corps reached the northern shore of Lake Ladoga by the 16th of July 1941, dividing the Soviet 7th Army. Finnish II Corps began its offensive in north Karelia on the 31st of July. By the 2nd of September, the Finnish Army had reached the old 1939 border after capturing Vyborg on the 29th of August.
Finnish Headquarters ordered II and IV Corps to halt their advance along a line running from Beloostrov to Lake Ladoga on the 31st of August. This position lay approximately 30 kilometers from Leningrad's center. Sporadic fighting continued around Beloostrov until Soviets evicted Finns on the 5th of September.
Military operations remained limited between 1942 and 1943 despite some front-line action. The Soviet Karelian Front attempted to retake Medvezhyegorsk in January 1942 but failed due to stubborn Finnish resistance. Spring offensives on the Svir River front and in Petsamo also proved unsuccessful against German counterattacks.
Field Marshal Mannerheim personally refused Hitler's request to assault Leningrad during their meeting at Immola Airfield on the 4th of June 1942. He explained that Finland wished to avoid further provocation of the Soviet Union. The city became ensnared between German and Finnish armies for over 900 days starting the 8th of September 1941.
Naval Detachment K operated on Lake Ladoga beginning in August 1942. This joint unit included four Italian MAS torpedo motorboats, four German KM-type minelayers, and the Finnish torpedo-motorboat Sisu. The detachment sank numerous smaller Soviet watercraft before dissolving in winter 1942, 43.
Soviet partisans conducted guerrilla operations from summer 1942 through 1944. The 1st Partisan Brigade infiltrated beyond Finnish patrol lines but was intercepted at Lake Segozero in August 1942. These irregular forces distributed propaganda newspapers including translations of Pravda.
On the 9th of June 1944, the Soviet Leningrad Front launched an offensive against Finnish positions on the Karelian Isthmus. Along a 50-kilometer breakthrough front, the Red Army concentrated 3,000 guns and mortars. In some places, artillery concentration exceeded 200 guns per kilometer of front line.
Soviet artillery fired over 80,000 rounds along the Karelian Isthmus during the first day of fighting. The second day saw artillery barrages and superior numbers crush the main Finnish defense line. The Red Army penetrated the Vammelsuu-Taipale line at Kuuterselkä by the sixth day.
By the 25th of June, the Red Army reached the Viipuri-Kuparsaari-Taipale line where the decisive Battle of Tali-Ihantala began. This engagement has been described as the largest battle in Nordic military history. Finland lacked modern anti-tank weaponry to stop Soviet heavy armor like KV-1 or IS-2 tanks.
German Foreign Minister Joachim von Ribbentrop offered hand-held Panzerfaust weapons in exchange for a guarantee that Finland would not seek separate peace. President Risto Ryti gave this personal undertaking on the 26th of June. Hitler sent additional infantry divisions and assault gun brigades to support Finnish forces.
The Finnish Parliament accepted Moscow's terms in a secret meeting on the 2nd of September 1944. The Finnish Army implemented an ceasefire at 8:00 a.m. Helsinki time on the 4th of September. The Red Army followed suit one day later.
A delegation led by Prime Minister Antti Hackzell and Foreign Minister Carl Enckell negotiated final terms starting the 14th of September. Molotov presented these terms on the 18th of September which were accepted by the Finnish Parliament the next day. The agreement required Finland to return to borders from the 1940 Moscow Peace Treaty.
Finland had to cede Petsamo municipality and lease Porkkala Peninsula to Soviets. War reparations totaling $300 million were demanded, reduced from an initial $600 billion request. The country also needed to expel German troops by the 15th of September 1944.
Disarmament of remaining German forces escalated into the Lapland War between Finland and Germany. Approximately 200,000 members of the 20th Mountain Army evacuated to Norway while being disarmed or arrested. Soviet authorities deported Ingrian Finns to central regions after refusing resettlement in Ingria.
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Common questions
What caused the Continuation War to begin in 1941?
The Continuation War began on the 22nd of June 1941 when Finnish forces launched Operation Kilpapurjehdus and deployed troops into the demilitarized Åland Islands. This operation coordinated with a German invasion after Soviet air attacks on the 25th of June provided justification for Finland to approve a defensive war.
Who commanded Finnish Defence Forces during the Continuation War?
Field Marshal C. G. E. Mannerheim assumed command of the Finnish Defence Forces on the 30th of November 1939 and led the nation throughout the conflict. He personally refused Adolf Hitler's request to assault Leningrad during their meeting at Immola Airfield on the 4th of June 1942.
When did the Continuation War end and what were the terms?
The Continuation War ended when the Finnish Parliament accepted Moscow's terms in a secret meeting on the 2nd of September 1944. The agreement required Finland to return to borders from the 1940 Moscow Peace Treaty, cede Petsamo municipality, lease Porkkala Peninsula to Soviets, and pay $300 million in war reparations.
What happened during the Battle of Tali-Ihantala in 1944?
The Battle of Tali-Ihantala began by the 25th of June 1944 when the Red Army reached the Viipuri-Kuparsaari-Taipale line after penetrating the Vammelsuu-Taipale line. This engagement is described as the largest battle in Nordic military history where Finland lacked modern anti-tank weaponry to stop Soviet heavy armor like KV-1 or IS-2 tanks.
How did Germany support Finland during the Continuation War?
Germany supported Finland through secret weapon sales permitted under an agreement signed on the 12th of September 1940 and later by sending additional infantry divisions and assault gun brigades. German Foreign Minister Joachim von Ribbentrop offered hand-held Panzerfaust weapons in exchange for a guarantee that Finland would not seek separate peace which President Risto Ryti gave on the 26th of June 1944.