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Snippet from Wikipedia: Operation Barbarossa

Operation Barbarossa (German: Unternehmen Barbarossa; Russian: Операция Барбаросса, romanized: Operatsiya Barbarossa) was the invasion of the Soviet Union by Nazi Germany and many of its Axis allies, starting on Sunday, 22 June 1941, during World War II. It was the largest and costliest land offensive in human history, with around 10 million combatants taking part, and over 8 million casualties by the end of the operation.

The operation, code-named after Frederick I "Barbarossa" ("red beard"), a 12th-century Holy Roman Emperor and Crusader, put into action Nazi Germany's ideological goals of eradicating communism, and conquering the western Soviet Union to repopulate it with Germans. The German Generalplan Ost aimed to use some of the conquered people as forced labour for the Axis war effort while acquiring the oil reserves of the Caucasus as well as the agricultural resources of various Soviet territories, including Ukraine and Byelorussia. Their ultimate goal was to create more Lebensraum (living space) for Germany, and the eventual extermination of the native Slavic peoples by mass deportation to Siberia, Germanisation, enslavement, and genocide.

In the two years leading up to the invasion, Nazi Germany and the Soviet Union signed political and economic pacts for strategic purposes. Following the Soviet occupation of Bessarabia and Northern Bukovina, the German High Command began planning an invasion of the Soviet Union in July 1940 (under the code-name Operation Otto). Over the course of the operation, over 3.8 million personnel of the Axis powers—the largest invasion force in the history of warfare—invaded the western Soviet Union, along a 2,900-kilometer (1,800 mi) front, with 600,000 motor vehicles and over 600,000 horses for non-combat operations. The offensive marked a massive escalation of World War II, both geographically and with the Anglo-Soviet Agreement, which brought the USSR into the Allied coalition.

The operation opened up the Eastern Front, in which more forces were committed than in any other theatre of war in human history. The area saw some of history's largest battles, most horrific atrocities, and highest casualties (for Soviet and Axis forces alike), all of which influenced the course of World War II and the subsequent history of the 20th century.

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