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Swiss-French War of 1937
Swiss Mountain Infantry patrol in the Alps.
On February 14, 1937 pro-French socialists won local election in Romandy, a French-speaking region of Switzerland. New local governments were disbanded by national government to prevent Communard infiltration of state legislatures. Commune of France issued direct ultimatum to allow elected governments to work and to held local plebiscite about possibility of joining France. There was no response - Swiss government mobilized 850,000 soldiers (February 17) and began preparations for a defensive war. Two days later, Red Army of Workers', Soldiers' and Peasants' crossed the border and attacked Swiss garrisons, followed by a German ultimatum, which had forced them to withdraw on February 18. 656 Frenchmen and 45 Swiss were killed during first two days of a war.
Switzerland later provided assistance to Germany during invasion on France.