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The Finns hoped that ultimately their efforts to slow down the Red Army would send a signal to the world that some countries, even some of the smallest, would take a stand against totalitarianism. Much of the Western press was sympathetic to the Finnish cause and when it seemed as though hostilities would break out, thousands of volunteers streamed into the Nordic nation to fight alongside the Finns on the Mannerheim Line. The major Western powers, though, remained reticent. The United Kingdom and France never declared war on the Soviet Union, even after the invasion of Poland, but a plan was developed to militarily aid the Finns in what became codenamed “Avonmouth.”

The French in particular embraced the plan enthusiastically, which was more about depriving Germany of iron-ore resources in neutral Sweden than it was about saving democratic Finland from the communist Soviet Union. Despite many in the French military openly advocating for Avonmouth, such as general Audet, the British never came on board and so the threat of foreign intervention on Finland’s behalf remained a threat, although a credible one that may have caused the Soviet high-command to make more measured moves. <ref> Cairns, John C. “Reflections on France, Britain and the Winter War Prodrome, 1939-40.” <i>Historical Reflections/Réflexions Historiques</i> 22 (1996) p. 212</ref>