Battle of France

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The French military knew that an invasion by Germany was likely in 1940, and they tried to prepare through modernization efforts and training. But, they made two big assumptions that would turn out to be false: The Ardennes Forest's challenging terrain would prevent an invasion through there, and Belgium would last for weeks or months, allowing France to re-deploy troops as necessary if the Germans invaded through there.

Instead, the Germans proved that many of their tanks could make it through the Ardennes Forest, and Belgium fell within days. France, despite having more modern equipment and slightly more troops, fell to Germany in only 46 days with 1.9 million troops taken prisoner, thousands of tanks and aircraft destroyed or captured, and most of their country under German control.

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