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Remembering the Nazi invasion of the Soviet Union

Sergey Ponomarev / AP

Russian Orthodox Church clergymen stand under rain during a wreath laying ceremony at the Tomb of the Unknown Soldier outside Moscow's Kremlin wall, June 22, 2011, to mark the 70th anniversary of the Nazi invasion of the Soviet Union.

Maxim Shipenkov / EPA

A woman visits the Preobrazhenskoye cemetery, during commemorations on the 70th anniversary of the Nazi invasion of the Soviet Union, in Moscow, June 22, 2011. Germany started their the military offensive called 'Operation Barbarossa,' on this day in 1941.

According to Wikipedia: On June 22, 1941, Germany, along with other European Axis members and Finland, invaded the Soviet Union in Operation Barbarossa,  the largest military operation in human history in both manpower and casualties.