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| German invasion of 1940 | |
|---|---|
| Conflict | Western Front campaigns of 1940 |
| Partof | Second World War |
| Date | April–June 1940 |
| Place | Western Europe, Scandinavia, Low Countries, France |
| Result | Axis victory; occupation and armistice |
German invasion of 1940
The German invasion of 1940 was a coordinated series of military and combined-arms operations in Western Europe, France, the Low Countries, Denmark, and Norway during the early period of the Second World War. It produced rapid territorial gains that led to the collapse of the French Third Republic's resistance, the evacuation of Allied forces at Dunkirk, and major shifts in strategic balance between the United Kingdom, the French Republic, and the German Reich.
In the aftermath of the Invasion of Poland and the signing of the Molotov–Ribbentrop Pact, German planners under Adolf Hitler and the OKW reorganized forces for Western operations, while the British Expeditionary Force and French Army maintained forward deployments in the Saar region and along the Maginot Line. The period known as the "Phoney War" followed the Declaration of war by the United Kingdom and France, during which naval actions such as the Altmark Incident and diplomatic events like the Winter War influenced political calculations by Winston Churchill, Édouard Daladier, and military leaders including Gerd von Rundstedt and Maurice Gamelin.
Operational planning centered on Fall Gelb and the later Case Red as German staff officers sought to avoid a repeat of the First World War's attritional stalemate. The Heer and Luftwaffe developed coordinated plans emphasizing armored thrusts led by panzer divisions under commanders such as Heinz Guderian and Erwin Rommel to drive through the Ardennes and cut behind Allied forces in the Low Countries. Political objectives included the neutralization of Belgium and Netherlands as Allied bases, the denial of Norwegian resources such as iron ore, and coercion of the French Republic into an armistice to secure Continental Europe for the Axis powers.
The main offensive began in May 1940 with coordinated assaults on the Netherlands, Belgium, and Luxembourg while a feint in the north drew Allied forces into the Dyle Plan positions. The German breakthrough through the Ardennes allowed panzer units to reach the English Channel near Abbeville in a maneuver culminating in the encirclement of Allied armies in northern France and the Low Countries. The resulting battles—among them the Battle of Sedan (1940), the Battle of Arras (1940), and fighting around Calais—preceded the organized withdrawal to the Dunkirk evacuation perimeter, where elements of the Royal Navy, Royal Air Force, and civilian vessels conducted sea evacuations that saved a substantial portion of the British Expeditionary Force and many French Army troops.
The simultaneous German assault in Scandinavia targeted Denmark for rapid occupation and Norway for control of strategic ports and shipping lanes used to transport Swedish iron ore through Narvik. Naval and airborne operations involved the Kriegsmarine, Luftwaffe, and Fliegerkorps in contested landings at Oslo, Kristiansand, and Bergen, prompting Allied naval interventions including operations led by elements of the Royal Navy and French Navy around Narvik. The campaign culminated in German consolidation of Oslofjord control and the eventual withdrawal of major Allied forces, though fighting at Narvik showcased combined-arms engagements between mountain troops and naval units.
German forces employed a combined-arms doctrine integrating Panzer I, Panzer II, Panzer III, and Panzer IV armored vehicles with motorized infantry, supported by Stuka dive bombers and the Messerschmitt Bf 109 fighter. The Heer's use of radio-equipped formations enhanced operational tempo compared with the largely horse-drawn elements of the French Army and the mechanized components of the British Expeditionary Force. Coastal and airborne operations made use of Fallschirmjäger and Küstenartillerie, while the Kriegsmarine sought control of sea lanes against Royal Navy squadrons and convoy operations.
German occupation authorities implemented policies under organizations such as the Reichskommissariat framework and military governance that affected civil life in occupied territories including France, Belgium, Netherlands, and Norway. Measures included requisitioning of resources, imposition of censorship, internment of political opponents, and collaboration negotiations with local administrations, provoking resistance movements like the French Resistance and Dutch and Belgian underground organizations. Urban centers including Rotterdam, Calais, and Lille experienced bombing and artillery damage, while civilian evacuations and refugee flows strained neighboring regions and humanitarian relief coordinated by groups such as the Red Cross.
The rapid German victories in Western Europe and Scandinavia precipitated the fall of the French Third Republic and the establishment of the Vichy France regime, altered Royal Navy and RAF strategic dispositions, and forced the United Kingdom to prepare for potential invasion culminating in defensive preparations such as the Battle of Britain. The occupation secured continental resources for the Wehrmacht and shifted diplomatic postures among neutral states including Spain and Switzerland. Militarily, the campaign validated German operational concepts that influenced later operations on the Eastern Front and in the Mediterranean, while politically it reshaped alliances and resistance that would determine subsequent phases of the Second World War.