In June 1944, what began the part of World War II in Europe that was known as the Second Front?

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The invasion across the English Channel by British, American, and Canadian forces, also known as D-Day, marked the beginning of the Second Front in Europe. This was a major Allied military operation that opened up a new front against German forces in western Europe, providing much-needed relief to the Soviet Union, which had been fighting the Germans alone in the east for years.

In June 1944, What Began the Part of World War