During World War II, Nazi Germany pursued a policy of aggressive territorial expansion that reshaped Europe and triggered global conflict. The invasions were executed in a calculated sequence, each designed to secure resources, eliminate strategic threats, and expand living space for the Third Reich.
Understanding the order of these campaigns provides clarity on how the war escalated and how Axis ambitions were translated into military action across multiple continents.
| Invasion | Date | Primary Targets | Theater |
|---|---|---|---|
| Poland | 1 September 1939 | W Poland, Baltic corridor | Europe |
| Denmark & Norway | 9 April 1940 | Strategic ports, iron ore routes | Europe |
| Low Countries & France | 10 May 1940 | Netherlands, Belgium, Luxembourg, France | Europe |
| Yugoslavia & Greece | 6 April 1941 | Balkan Peninsula | Europe |
| USSR (Operation Barbarossa) | 22 June 1941 | Belarus, Ukraine, Baltic states, Western Russia | Europe |
| Imperial Japan coordination | 7–8 December 1941 | US Pacific, Malaya, Philippines | Asia-Pacific |
| North Africa | February 1941 | Libya, Egypt | Mediterranean/Africa |
| Hungary | 19 March 1944 | Occupation after armistice break | Europe |
Germany Invades Poland and Scandinavia
The Blitzkrieg in the West Begins
Following the partition of Poland, Hitler turned westward, exploiting diplomatic delays to strike Denmark and Norway to secure iron ore shipments and naval bases. The invasions of April 1940 demonstrated the reach of German air and land power and neutralized immediate threats from Scandinavian waters.
Fall of France and the Low Countries
In May 1940, Germany bypassed the Maginot Line by sweeping through the Ardennes, sweeping into Belgium, the Netherlands, and Luxembourg before driving deep into France. Paris fell in June, and the campaign established Germany as the dominant military power on the European continent.
The Balkan and Mediterranean Campaigns
Italy’s stalled war in Greece prompted Hitler to intervene directly, launching invasions of Yugoslavia and Greece in April 1941. Securing the southern flank prevented Allied access to the resource-rich Balkans and ensured safer routes for Romanian oil shipments vital to the German war machine.
Later that year, German Afrika Korps units were dispatched to North Africa to support Italian forces. This extension of the war into the Mediterranean transformed a regional conflict into a three front struggle involving British Commonwealth forces and set the stage for prolonged desert warfare.
Operation Barbarossa and the Eastern Front
The invasion of the Soviet Union in June 1941 marked the largest military operation in history and embodied Hitler’s ideological aims of Lebensraum and racial conquest. German armies advanced across Belarus, Ukraine, and the Baltic states in an initial blitz that pushed deep into Soviet territory despite logistical overextension and fierce resistance.
Global Expansion and Axis Coordination
Although European theaters consumed German resources, the declaration of war on the United States after Pearl Harbor linked the European and Asian theaters. German U-boat campaigns in the Atlantic and limited offensive actions in North Africa reflected an attempt to force a strategic stalemate while Japan bore the brunt of early Pacific advances.
Key Takeaways on German Aggression in WWII
- Germany invaded nations sequentially to secure resources, eliminate threats, and expand territory.
- Early Blitzkrieg victories in Poland, Norway, Denmark, and France established temporary dominance in Europe.
- The invasions of Yugoslavia, Greece, and North Africa extended the war into the Mediterranean.
- Operation Barbarossa on the Eastern Front became the largest theater of war and a brutal stalemate.
- Axis coordination with Japan and involvement in global theaters broadened the conflict into a truly world war.
FAQ
Reader questions
Why did Germany invade Poland first in World War II?
Germany invaded Poland to regain territories lost after World War I, secure living space (Lebensraum), and test Western resolve. The invasion triggered the British and French guarantees to Poland, transforming the regional conflict into a world war.
What was the main goal of the invasion of the Soviet Union in 1941?
The main goal was to destroy the Soviet state, seize western Soviet territories for German settlement, and acquire resources such as oil and grain to sustain Germany in a long war against Britain and the United States.
How did the invasions of Denmark and Norway impact the war in Europe?
These invasions ensured German access to Swedish iron ore, secured northern flanks, and led to the displacement of British forces from Scandinavia, allowing Germany to project power into the North Atlantic and Arctic waters.
What role did the Balkan campaigns play in Germany’s overall war strategy?
Securing the Balkans protected Romanian oil fields, neutralized potential Allied footholds close to the Ploiești refineries, and provided staging grounds for the invasion of Greece and Yugoslavia before Barbarossa.