what was the codename for the invasion of eastern Europe during WWII?

i dont know who did the invaiding or anything its just my homework

operation Barbarossa

Read the book maybe help you understand more before you ask the question.

The Codename for the Allied Invasion of Normandy and Europe was Operation OVERLORD!!!!

The invasion of Eastern Europe, that is, the Soviet Union by the Germans and their allies, was codenamed Operation Barbarossa. [German: ''Unternehmen Barbarossa''].

There is a good and balanced write-up in wikipedia at http://en.wikipedia.org/wiki/Operation_Barbarossa

If you are referring to the German offensive on the USSR it was called Operation Barbarossa.