Quote:
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During the German Blitzkrieg in France in May 1940 the Allied defense broke already after two weeks which was the reason for a hasty withdrawal of the British troops and capitulation of France. Polish units fought in the southern section of the front: the Polish Grenadier Division after one week of combat was dissolved because of the French-German armistice talks; the soldiers of the Brygada Kawalerii Pancerno-Motorowej (Armoured Cavalry Brigade) after the battles of Champaubert and Montbard upon the order of their commander, General Maczek, destroyed their equipment and withdrew south; 2 Dywizja Strzelców (2nd Riflemen Division) stopped the German attack on the Clos-du-Doubs hills but when on June 19 it turned out that the fight is almost over, it crossed the Swiss border and was interned there
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I gather that the French crossed the frontier as a result of the agreement between the French and Swiss to defend Switzerland in the event of a German invasion. Somehow the impression was given that this had happened and so forces crossed over but subsequently returned.
This is definitely a candidate for further study.