Germany launches the Western offensive against France and the Low Countries

On May 10, 1940, Nazi Germany initiated Fall Gelb (Case Yellow), launching a sweeping offensive against France, Belgium, the Netherlands, and Luxembourg. While Allied military planners anticipated a repeat of World War I tactics through Belgium, German armored spearheads unexpectedly surged through the heavily forested Ardennes region, bypassing the formidable static defenses of the Maginot Line.

Executing Erich von Manstein's daring operational plan, General Heinz Guderian's panzer forces crossed the Meuse River at Sedan on May 13. The rapid armored advance raced toward the English Channel, encircling British and French armies in northern France and cutting them off from the main French forces to the south.

The offensive shattered Allied morale and operational cohesion within weeks. It precipitated the miraculous British evacuation at Dunkirk, the fall of Paris on June 14, and France's surrender on June 22, leaving Britain as the sole remaining Western democracy opposing Nazi Germany.

Why it matters

The fall of France fundamentally altered the global geopolitical balance, giving Germany control of Western Europe and access to French naval ports and resources. It brought Winston Churchill to power in Britain and demonstrated that static defense doctrines were completely obsolete against modern, rapid combined-arms warfare.

Interesting fact

German soldiers were supplied with millions of Pervitin (methamphetamine) tablets, enabling armored crews to advance for three straight days without sleep through the Ardennes.