1 September 19391,Germany attacked Poland, Britain and France declared war on Germany, and World War II broke out in an all-round way. 194 1 In the spring of, the Germans took control of Western Europe, Northern Europe and the Balkans. 194 1 On June 22nd, 2000, Germany tore up the non-aggression treaty between the Soviet Union and Germany, assembled its vassal countries Finland, Hungary and Romania, and launched a surprise attack on the Soviet Union in three ways, making the Soviet Union the main battlefield of the world anti-fascist war in Europe. Under the leadership of Stalin, the Soviet people started the great patriotic war, and the Second World War entered a new stage. At the beginning of the Great Patriotic War, the Germans quickly occupied all of Lithuania, most of Latvia, parts of Belarus and Ukraine. 194 1 year, the Germans invaded Moscow on a large scale, and the Soviet army launched an active defense to destroy a large number of German effective forces. 1942, 1 won the battle of Moscow. 1October 9 1942, 165438+ Soviet troops launched a counterattack in Stalingrad, and on February 2 1943, the main German army was wiped out. The Germans suffered heavy losses and completely lost the strategic initiative. The Soviet army basically reversed the overall situation of the Great Patriotic War and World War II. Soon the Soviets won the Kursk War and recovered a large area of lost land. 1944, the Soviet army launched a strategic general counterattack. Through 10 attacks on the German army, all the occupied land was recovered, and the military action was transferred to the territory of Germany and its vassal countries, forcing Finland, Romania, Bulgaria and Hungary to quit the war against the Soviet Union and turn against Germany. At the beginning of 1945, Soviet troops launched a powerful offensive, invaded Poland and Czechoslovakia, and occupied East Prussia and Silesia. 1945 On May 2nd, Soviet troops conquered Berlin, forcing Germany to surrender unconditionally on May 8th.