The months following the triumph over Poland passed quietly. Many mocked the idleness as a “phony war,” but the British and French were busy behind the scenes, hastily mobilizing their armies in preparation for an expected German invasion of Western Europe. The Germans were active as well, accelerating their buildup and racing to replenish losses of tanks and aircraft in Poland.
The next move, however, came in Northern Europe. In April 1940, the Germans attacked Norway and Denmark, vying for control of Scandinavian waterways used to transport iron ore from neutral Sweden to German industrial plants. The undermanned Danes surrendered in a day, while the Norwegians held out for nearly two months before succumbing as well.
The greater prize for Hitler was France, where he intended to avenge Germany’s humiliating defeat in the First World War. The Allies were confident in the Maginot Line defenses along the Franco-German border, and with the Germans likely to invade instead from the Low Countries (Belgium and Holland), French and British armies were positioned across from northern Belgium, where the flat and open terrain could be easily navigated by German tanks.
It proved a grievous error. The Germans did indeed invade Belgium and Holland, but moved their strongest armor into the Ardennes, a densely wooded region in southern Belgium. It was rugged terrain, but the German tanks navigated it far swifter than the Allies thought possible and swept into the French interior with ease. Rather than charging toward Paris, the Germans unveiled another surprise, wheeling toward the English Channel coast and cutting off British and French forces trapped to the north. Hitler’s forces then steamrolled toward Paris, barely slowed by a collapsing resistance. The French prime minister resigned and was promptly replaced by Marshal Henri Phillipe Pétain, a hero of the previous war. Hoping to avoid further bloodshed, Pétain brokered an armistice, and triumphant German troops were soon parading down the Champs Élysées.
It was a crowning victory for Hitler, whose armies had toppled France in just six weeks and taken 1.5 million French prisoners. More than 90,000 French troops were killed in the fighting, doubling German losses.