Adolf Hitler
Path to defeat

On 22 June 1941, contravening the Molotov–Ribbentrop Pact of 1939, over three million Axis troops attacked the Soviet Union. This offensive (codenamed Operation Barbarossa) was intended to destroy the Soviet Union and seize its natural resources for subsequent aggression against the Western powers. The action was also part of the overall plan to obtain more living space for German people; and Hitler thought a successful invasion would force Britain to negotiate a surrender. The invasion conquered a huge area, including the Baltic republics, Belarus, and West Ukraine. By early August, Axis troops had advanced 500 km (310 mi) and won the Battle of Smolensk. Hitler ordered Army Group Centre to temporarily halt its advance to Moscow and divert its Panzer groups to aid in the encirclement of Leningrad and Kiev. His generals disagreed with this change, having advanced within 400 km (250 mi) of Moscow, and his decision caused a crisis among the military leadership. The pause provided the Red Army with an opportunity to mobilise fresh reserves; historian Russel Stolfi considers it to be one of the major factors that caused the failure of the Moscow offensive, which was resumed in October 1941 and ended disastrously in December. During this crisis, Hitler appointed himself as head of the Oberkommando des Heeres.

On 7 December 1941, Japan attacked the American fleet based at Pearl Harbor, Hawaii. Four days later, Hitler declared war against the United States. On 18 December 1941, Himmler asked Hitler, "What to do with the Jews of Russia?", to which Hitler replied, "als Partisanen auszurotten" ("exterminate them as partisans"). Israeli historian Yehuda Bauer has commented that the remark is probably as close as historians will ever get to a definitive order from Hitler for the genocide carried out during the Holocaust.

In late 1942, German forces were defeated in the Second Battle of El Alamein, thwarting Hitler's plans to seize the Suez Canal and the Middle East. Overconfident in his own military expertise following the earlier victories in 1940, Hitler became distrustful of his Army High Command and began to interfere in military and tactical planning, with damaging consequences. In December 1942 and January 1943, Hitler's repeated refusal to allow their withdrawal at the Battle of Stalingrad led to the almost total destruction of the 6th Army. Over 200,000 Axis soldiers were killed and 235,000 were taken prisoner. Thereafter came a decisive strategic defeat at the Battle of Kursk. Hitler's military judgement became increasingly erratic, and Germany's military and economic position deteriorated, as did Hitler's health.

Following the Allied invasion of Sicily in 1943, Mussolini was removed from power by King Victor Emmanuel III after a vote of no confidence of the Grand Council of Fascism. Marshal Pietro Badoglio, placed in charge of the government, soon surrendered to the Allies. Throughout 1943 and 1944, the Soviet Union steadily forced Hitler's armies into retreat along the Eastern Front. On 6 June 1944, the Western Allied armies landed in northern France in one of the largest amphibious operations in history, Operation Overlord. Many German officers concluded that defeat was inevitable and that continuing under Hitler's leadership would result in the complete destruction of the country.

Between 1939 and 1945, there were numerous plans to assassinate Hitler, some of which proceeded to significant degrees. The most well-known and significant, the 20 July plot of 1944, came from within Germany and was at least partly driven by the increasing prospect of a German defeat in the war. Part of Operation Valkyrie, the plot involved Claus von Stauffenberg planting a bomb in one of Hitler's headquarters, the Wolf's Lair at Rastenburg. Hitler narrowly survived because staff officer Heinz Brandt moved the briefcase containing the bomb behind a leg of the heavy conference table, which deflected much of the blast. Later, Hitler ordered savage reprisals resulting in the execution of more than 4,900 people. Hitler was put on the United Nations War Crimes Commission 's first list of war criminals in December 1944, after determining that Hitler could be held criminally responsible for the acts of the Nazis in occupied countries. By March 1945, at least seven indictments had been filed against him.
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