Poland
On September 1, 1939, Germany invaded Poland. This began World War II. The Germans used a new kind of attack. They called it blitzkrieg, or “lightning war.” Blitzkrieg relied on fast-moving tanks and warplanes to shock the enemy into surrendering.
After this invasion, Britain and France declared war on Germany. Australia, New Zealand, Canada, India, and South Africa joined Britain on the side of the Allies. But no one could help when the Soviet Union attacked Poland on September 17. Germany and the Soviet Union divided Poland between them. The Soviet Union also invaded Latvia, Lithuania, Estonia, and Finland during 1939.
Scandinavia and the Low Countries
Between April and June 1940 the Germans took over Norway and Denmark. In May they moved into the Low Countries—Belgium, the Netherlands, and Luxembourg.
France
In mid-May 1940 the first German troops crossed into France. By June 14 the Germans had entered Paris, the French capital.
On June 22 France agreed to let Germans rule most of their country. However, many French people continued to fight the Germans. They were called the Free French. They took orders from Charles de Gaulle. De Gaulle’s headquarters were in Britain.
As France was falling to the Germans, Italy declared war against France and Britain. On June 10, 1940, Italy entered the war as an Axis power.
Great Britain
Hitler’s next target was the island of Great Britain. Starting in June 1940, German warplanes began bombing Britain. However, the British had a new invention called radar. Radar warned the British when German aircraft were nearing. British fighter airplanes shot down many attackers. This battle, called the Battle of Britain, was the world’s first major battle fought in the air.
The Germans soon decided not to invade Britain. Instead, they dropped more bombs on London and other cities until May 1941.
The Atlantic Ocean
The British also fought the German navy. Early in the war, the Germans sank many of the supply ships that delivered food and weapons from North America. In 1943 the Allies began to use aircraft carriers to protect convoys, or groups, of supply ships. The number of supply ships reaching Britain then increased.
North Africa
In the autumn of 1940 the Italians invaded Egypt. They wanted to control the Suez Canal, which linked the Mediterranean Sea to the Red Sea and the Indian Ocean. However, the British drove the Italians back.
Then the German general Erwin Rommel led the Germans to victories in North Africa. In 1942 British forces finally stopped Rommel in two battles at El-Alamein, Egypt. By November 6 the British had driven the Germans from Egypt.
The Soviet Union
After conquering the countries on Germany’s borders, Hitler invaded the Soviet Union. The attack began on June 22, 1941. The Soviet Union joined the Allies soon afterward. The Soviets stopped the Germans on the edges of Moscow (the Soviet capital) and Leningrad (now Saint Petersburg).
In 1942 Hitler decided to take the Soviet city of Stalingrad (now Volgograd). The fight at Stalingrad was the largest single battle in World War II. About 1.9 million soldiers died on both sides. The Germans surrendered in January 1943. After Stalingrad, the Soviets gradually drove out the Germans.
