Franco-British plans for intervention in the Winter War

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During the early stages of World War II, the British and French Allies made a series of proposals to send troops to assist Finland in the Winter War against the Soviet Union which started on 30 November 1939. The war was a consequence of the Molotov-Ribbentrop Pact. The plans involved the transit of British and French troops and equipment through neutral Norway and Sweden. The initial plans were abandoned due to Norway and Sweden declining transit through their land, fearing their countries would be drawn into the war. The Moscow Peace Treaty ended the war in March 1940, precluding the possibility of intervention.


The Winter War started in November 1939. In February 1940, a Soviet offensive broke through the Mannerheim Line on the Karelian Isthmus, exhausting Finnish defenses and forcing the country's government to accept peace negotiations on Soviet terms. At the news that Finland might be forced to cede its sovereignty to the USSR, public opinion in France and Britain, already favorable to Finland, swung in favor of military intervention. When rumors of an armistice reached governments in Paris and London, both decided to offer military support.

Initial Allied approaches[edit]

Franco-British support was offered on the condition their armed forces be given free passage through neutral Norway and Sweden instead of taking the difficult and Soviet-occupied passage from Petsamo.

The first intervention plan, approved on 4–5 February 1940 by the Allied High Command, consisted of 100,000 British and 35,000 French troops that were to disembark at the Norwegian port of Narvik and support Finland via Sweden while securing supply routes along the way. Plans were made to launch the operation on 20 March under the condition of a formal request for assistance from the Finnish government (this was done to avoid German charges that the Franco-British forces constituted an invading army). On 2 March, transit rights were officially requested from the governments of Norway and Sweden. It was hoped that Allied intervention would eventually bring the neutral Nordic countries, Norway and Sweden, to the Allied side by strengthening their positions against Germany—although Hitler had by December declared to the Swedish government that Franco-British troops on Swedish soil would immediately provoke a German invasion.

The Franco-British plan, as initially designed, proposed a defense of all of Scandinavia north of a line StockholmGothenburg or Stockholm–Oslo, i.e. the British concept of the Lake Line following the lakes of Mälaren, Hjälmaren, and Vänern, which would provide a good natural defense some 1,700–1,900 kilometres (1,000–1,200 miles) south of Narvik. The planned frontier not only involved Sweden's two largest cities but could result in large amounts of Swedish territory being either occupied by a foreign army or becoming a war zone. The plan was revised[when?] to include only the northern half of Sweden and the narrow adjacent Norwegian coast.

Norwegian reaction[edit]

The Norwegian government denied transit rights to the proposed Franco-British expedition.

Swedish reaction[edit]

The Swedish government, headed by Prime Minister Per Albin Hansson, declined to allow transit of armed troops through Swedish territory, in spite of the fact that Sweden had not declared itself neutral in the Winter War. The Swedish government argued that, since it had declared a policy of neutrality in the war between France, Britain and Germany, the granting of transit rights by Sweden to a Franco-British corps, even though it would not be used against Germany, was still an illegal departure from international laws on neutrality.

This strict interpretation appears to[according to whom?] have been a pretext to avoid angering the Soviet and Nazi German governments, as it was abandoned after fifteen months. On 18 June 1941, the Swedish government quickly agreed to German demands for transit rights across Sweden for German troops on their way from occupied Norway to Finland, in order to join the German attack on the Soviet Union.[1] A total of 2,140,000 German soldiers and more than 100,000 German military railway carriages crossed neutral Swedish territory during the next three years.[2]

The Swedish Cabinet also decided to reject repeated Finnish pleas for regular Swedish troops to be deployed in Finland and the Swedes also made it clear that their present support in arms and munitions, could not be maintained for much longer. Diplomatically, Finland was squeezed between Allied hopes for a prolonged war and Swedish and Norwegian fears that the Allies and Germans might soon be fighting each other on Swedish and Norwegian soil. Norway and Sweden also feared an influx of Finnish refugees if Finland lost to the Soviets.

Further Allied proposals and their effect on peace negotiations[edit]

While Germany and Sweden pressured Finland to accept peace on unfavorable conditions, Britain and France had the opposite objective. Different plans and figures were presented for the Finns. France and Britain promised to send 20,000 men, who were to arrive by the end of February. By the end of that month, Finland's Commander-in-Chief, Field Marshal Mannerheim, was pessimistic about the military situation and on 29 February the government decided to start peace negotiations. That same day, the Soviets commenced an attack against Viipuri.

When France and Britain realized that Finland was considering a peace treaty, they gave a new offer of 50,000 troops, if Finland asked for help before 12 March.

See also[edit]




  • Andersson, Lennart B3 Junkers Ju86 i Sverige
  • Cox, Geoffrey (1941) The Red Army Moves (Victor Gollancz, London).
  • Engle, Eloise & Paananen, Lauri (1992). The Winter War: The Soviet Attack on Finland 1939–1940. Stackpole Books. ISBN 0-8117-2433-6.
  • Jakobson, Max (1961). The Diplomacy of the Winter War: An Account of the Russo-Finnish War, 1939–1940. Cambridge, MA: Harward University Press.
  • Öhquist, Harald (1949). Talvisota minun näkökulmastani. Helsinki: WSOY. (in Finnish)
  • Ries, Tomas (1988). Cold Will: Defence of Finland. Brassey's. ISBN 0-08-033592-6.
  • Schwartz, Andrew J. (1960). America and the Russo-Finnish War. Washington, D.C.: Public Affairs Press.
  • Tanner, Väinö (1957) The Winter War: Finland against Russia 1939–1940 Stanford University Press, California; also London.
  • Trotter, William R. (2002, 2006) [1991]. The Winter war: The Russo–Finno War of 1939–40 (5th ed.). New York (Great Britain: London): Workman Publishing Company (Great Britain: Aurum Press). ISBN 1-85410-881-6. First published in the United States under the title A Frozen Hell: The Russo–Finnish Winter War of 1939–40  Check date values in: |date= (help)
  • Upton, Anthony F. (1974). Finland 1939–1940 (University of Delaware Press, Newark: part of series The Politics and Strategy of the Second World War) ISBN 0-87413-156-1
  • Van Dyke, Carl (1997). The Soviet Invasion of Finland, 1939-40. Frank Cass Publishers. ISBN 0-7146-4314-9.
  • Vehviläinen, Olli (2002). Finland in the Second World War: Between Germany and Russia. New York: Palgrave. ISBN 0-333-80149-0.
  • "Finland i Krig 1939-1940" – multiple authors. ISBN 951-50-1182-5