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In June 1940, Germany invaded the Soviet Union. It was a surprise attack that violated the Molotov-Ribbentrop treaty signed in 1939 between Germany and the Soviet Union. The agreeement agreement was a non-aggression pact between Nazi Germany and the Soviet Union that was intended to ensure that neither country attacked the other.<ref> Antill, Peter, ''[https://www.amazon.com/gp/product/1846030285/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1846030285&linkCode=as2&tag=dailyh0c-20&linkId=5003bb4d6f737c623351c1b4b5e3dd33 Stalingrad 1942]'' (Osprey Publishing, London, 2007), p. 18</ref> Up to one million German soldiers and their allies pushed into western Soviet Union on the first day of the German invasion. As a result of their tactical surprise, the German army achieved a series of spectacular victories. Despite heroic Soviet resistance, Germany seized much of present day Belorussia, Ukraine and the Baltic States.<ref> Bellamy, Chris, ''[https://www.amazon.com/gp/product/0375724710/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0375724710&linkCode=as2&tag=dailyh0c-20&linkId=16f371fee7048dbf23fed6056f05d325 Absolute War: Soviet Russia in the Second World War]''. New York: Alfred A. Knopf & Random House.2007), p. 23</ref> The Red army suffered spectacular reverses and sustained massive losses. Hundreds of thousands of Soviet troops were killed and up to a million and a half taken, prisoner. A quarter of a million men surrendered during the German capture of Kiev, alone.<ref>Antill, p. 18</ref>