The Eastern Front of World War 2 consisted of 9 countries from Germany to Russia. It began with Germany invading Poland in 1939. In 1941, Germany betrayed the Soviet Union by invading in Operation Barbarossa with the goal of gaining territory. This led to major battles at Moscow, Stalingrad, and Kursk as the Soviets resisted the German invasion. Key turning points were the German failure to take Moscow in 1941-1942 and the destruction of the German 6th Army at Stalingrad in early 1943. Though immensely costly, the Soviet Union pushed the Germans back through major victories, taking the war to Berlin by 1945 and contributing greatly to the defeat of Nazi Germany.